openwrt/staging/blogic.git
9 years agoBluetooth: hci_intel: Implement LPM suspend/resume
Loic Poulain [Wed, 2 Sep 2015 10:04:11 +0000 (12:04 +0200)]
Bluetooth: hci_intel: Implement LPM suspend/resume

Add LPM PM suspend/resume/host_wake LPM functions.
A LPM transaction is composed with a LPM request and ack/response.
Host can send a LPM suspend/resume request to the controller which
should respond with a LPM ack.
If resume is requested by the controller (irq), host has to send a LPM
ack once resumed.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: hci_bcm: Use bt_dev logging helpers
Frederic Danis [Tue, 1 Sep 2015 10:13:36 +0000 (12:13 +0200)]
Bluetooth: hci_bcm: Use bt_dev logging helpers

Replace BT_ logging calls by the new bt_dev ones.

Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: hci_bcm: Replace spinlock by mutex
Frederic Danis [Tue, 1 Sep 2015 10:13:35 +0000 (12:13 +0200)]
Bluetooth: hci_bcm: Replace spinlock by mutex

Replace spinlock by mutex to be able to use bcm_device_lock in
sleepable context like devm_request_threaded_irq or upcomming PM support.

Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: hci_qca: Fix a few tab vs spaces issues
Marcel Holtmann [Sun, 30 Aug 2015 21:05:32 +0000 (23:05 +0200)]
Bluetooth: hci_qca: Fix a few tab vs spaces issues

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
9 years agoBluetooth: hci_intel: Replace spinlock with mutex
Loic Poulain [Mon, 31 Aug 2015 16:34:31 +0000 (18:34 +0200)]
Bluetooth: hci_intel: Replace spinlock with mutex

Replace the device_intel list spinlock with a mutex.
devm_request_threaded_irq is not atomic and upcomming PM support should
be simpler.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: hci_intel: Use bt_dev logging helpers
Loic Poulain [Mon, 31 Aug 2015 16:34:30 +0000 (18:34 +0200)]
Bluetooth: hci_intel: Use bt_dev logging helpers

Replace BT_ logging calls by the new bt_dev ones.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: hci_intel: Introduce LPM support
Loic Poulain [Sat, 29 Aug 2015 11:38:19 +0000 (13:38 +0200)]
Bluetooth: hci_intel: Introduce LPM support

Enable controller Low-Power-Mode if we have a pdev to manage host
wake-up. Once LPM is enabled, controller notifies its TX status via
a vendor specific packet (tx_idle/tx_active).
tx_active means that there is more data upcoming from controller.
tx_idle means that controller can be put in suspended state.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: hci_intel: Retrieve host-wake IRQ
Loic Poulain [Sat, 29 Aug 2015 11:38:18 +0000 (13:38 +0200)]
Bluetooth: hci_intel: Retrieve host-wake IRQ

An IRQ can be retrieved from the pdev resources. This irq will be used
in case of LPM suspend mode to wake-up the host and resume the link.
This resource can be declared as a GPIO-Interrupt which requires to be
converted into IRQ.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: Add bt_dev logging macros
Loic Poulain [Sun, 30 Aug 2015 16:16:55 +0000 (18:16 +0200)]
Bluetooth: Add bt_dev logging macros

Add specific bluetooth device logging macros since hci device name is
repeatedly referred in bluetooth subsystem logs.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: btusb: Detect new kind of counterfeit CSR controllers
Johan Hedberg [Sun, 30 Aug 2015 18:47:21 +0000 (21:47 +0300)]
Bluetooth: btusb: Detect new kind of counterfeit CSR controllers

Controllers claiming to be CSR with LMP subversion 0x0c5c don't
actually seem to be authentic CSR controllers. They also don't have
their USB bcdDevice value matching the LMP subversion like all other
CSR controllers:

HCI:

> HCI Event: Command Complete (0x0e) plen 12
      Read Local Version Information (0x04|0x0001) ncmd 1
        Status: Success (0x00)
        HCI version: Bluetooth 2.0 (0x03) - Revision 3164 (0x0c5c)
        LMP version: Bluetooth 2.0 (0x03) - Subversion 3164 (0x0c5c)
        Manufacturer: Cambridge Silicon Radio (10)

USB:

T: Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 3 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=16 #Cfgs= 1
P: Vendor=0a12 ProdID=0001 Rev= 1.34
C:* #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=1ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 0 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 0 Ivl=1ms
I: If#= 1 Alt= 1 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 9 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 9 Ivl=1ms
I: If#= 1 Alt= 2 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 17 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 17 Ivl=1ms

These controllers also have the HCI_Read_Stored_Link_Key command
broken so it's important the right quirk is set for them.

Reported-and-tested-by: Rhobison Alves Pereira <rhobison@hotmail.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agoBluetooth: Use BROKEN_STORED_LINK_KEY quirk for HCI_Read_Stored_Link_Key
Johan Hedberg [Sun, 30 Aug 2015 18:47:20 +0000 (21:47 +0300)]
Bluetooth: Use BROKEN_STORED_LINK_KEY quirk for HCI_Read_Stored_Link_Key

Some counterfeit CSR controllers also have broken behavior with the
HCI_Read_Stored_Link_Key command:

< HCI Command: Read Stored Link Key (0x03|0x000d) plen 7
        Address: 00:00:00:00:00:00 (OUI 00-00-00)
        Read all: 0x01
> HCI Event: Command Complete (0x0e) plen 8
      Read Stored Link Key (0x03|0x000d) ncmd 1
        Status: Unsupported Feature or Parameter Value (0x11)
        Max num keys: 0
        Num keys: 0

Extend the existing HCI_QUIRK_BROKEN_STORED_LINK_KEY to be also used
for this HCI command.

Reported-and-tested-by: Rhobison Alves Pereira <rhobison@hotmail.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
9 years agonet: fix cdc-phonet.c dependency and build error
Randy Dunlap [Wed, 16 Sep 2015 18:32:41 +0000 (11:32 -0700)]
net: fix cdc-phonet.c dependency and build error

Fix build error caused by missing Kconfig dependency:

ERROR: "cdc_parse_cdc_header" [drivers/net/usb/cdc-phonet.ko] undefined!

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agocdc: add header guards
Stephen Rothwell [Wed, 16 Sep 2015 01:10:16 +0000 (11:10 +1000)]
cdc: add header guards

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agortnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats
Sowmini Varadhan [Fri, 11 Sep 2015 20:48:48 +0000 (16:48 -0400)]
rtnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats

Many commonly used functions like getifaddrs() invoke RTM_GETLINK
to dump the interface information, and do not need the
the AF_INET6 statististics that are always returned by default
from rtnl_fill_ifinfo().

Computing the statistics can be an expensive operation that impacts
scaling, so it is desirable to avoid this if the information is
not needed.

This patch adds a the RTEXT_FILTER_SKIP_STATS extended info flag that
can be passed with netlink_request() to avoid statistics computation
for the ifinfo path.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agocdc: Fix build warning.
David S. Miller [Tue, 15 Sep 2015 20:25:03 +0000 (13:25 -0700)]
cdc: Fix build warning.

   In file included from drivers/usb/gadget/function/u_serial.h:16:0,
                    from drivers/usb/gadget/function/f_acm.c:23:
>> include/linux/usb/cdc.h:47:5: warning: 'struct usb_interface' declared inside parameter list
        int buflen);
        ^
>> include/linux/usb/cdc.h:47:5: warning: its scope is only this definition or declaration, which is probably not what you want

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agomv643xx_eth: Neaten mv643xx_eth_program_multicast_filter
Joe Perches [Thu, 10 Sep 2015 00:40:56 +0000 (17:40 -0700)]
mv643xx_eth: Neaten mv643xx_eth_program_multicast_filter

The code around the allocation and loops are a bit obfuscated.

Neaten it by using:

o kcalloc with decimal count and sizeof(u32)
o Decimal loop indexing and i++ not i += 4
o A promiscuous block using a similar style
  to the multicast block
o Remove unnecessary variables

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agoMerge branch 'xgene-2nd-10gbe-port'
David S. Miller [Tue, 15 Sep 2015 19:47:47 +0000 (12:47 -0700)]
Merge branch 'xgene-2nd-10gbe-port'

Iyappan Subramanian says:

====================
driver: net: xgene: Enable 2nd 10GbE port on APM X-Gene SoC

This patch adds support for 2nd 10GbE on APM X-Gene SoC
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agodtb: xgene: Add 2nd 10GbE node
Iyappan Subramanian [Tue, 8 Sep 2015 22:50:27 +0000 (15:50 -0700)]
dtb: xgene: Add 2nd 10GbE node

Adding the second 10GbE dt node for APM X-Gene SoC device tree

Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agodriver: net: xgene: Add support for 2nd 10GbE port
Iyappan Subramanian [Tue, 8 Sep 2015 22:50:26 +0000 (15:50 -0700)]
driver: net: xgene: Add support for 2nd 10GbE port

Adding support for the second 10GbE port on APM X-Gene SoC

Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agocdc-phonet: use common parser
Oliver Neukum [Mon, 7 Sep 2015 14:05:42 +0000 (16:05 +0200)]
cdc-phonet: use common parser

This moves cdc-phonet to the common parser for CDC users
to reduce code duplication.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agoqmi-wwan: use common parser
Oliver Neukum [Mon, 7 Sep 2015 14:05:41 +0000 (16:05 +0200)]
qmi-wwan: use common parser

This moves qmi-wwan to the common parser for CDC user
to reduce code duplication.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agocdc-ether: switch to common CDC parser
Oliver Neukum [Mon, 7 Sep 2015 14:05:40 +0000 (16:05 +0200)]
cdc-ether: switch to common CDC parser

This patch uses the common parser to parse extra CDC
headers in order to reduce code duplication.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agocdc-ncm: use common parser
Oliver Neukum [Mon, 7 Sep 2015 14:05:39 +0000 (16:05 +0200)]
cdc-ncm: use common parser

This moves cdc-ncm to the common parser for CDC user
to reduce code duplication.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agoCDC: common parser for extra headers
Oliver Neukum [Mon, 7 Sep 2015 14:05:38 +0000 (16:05 +0200)]
CDC: common parser for extra headers

CDC drivers all implement their own parser for the extra headers.
This patch fixes the code duplication introducing a single common
parser in usbnet.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agodrivers: net: cpsw: Add support to drive gpios for ethernet to be functional
Mugunthan V N [Mon, 7 Sep 2015 09:46:44 +0000 (15:16 +0530)]
drivers: net: cpsw: Add support to drive gpios for ethernet to be functional

In DRA72x EVM, by default slave 1 is connected to the onboard
phy, but slave 2 pins are also muxed with video input module
which is controlled by pcf857x gpio and currently to select slave
0 to connect to phy gpio hogging is used, but with
omap2plus_defconfig the pcf857x gpio is built as module. So when
using NFS on DRA72x EVM, board doesn't boot as gpio hogging do
not set proper gpio state to connect slave 0 to phy as it is
built as module and you do not see any errors for not setting
gpio and just mentions dhcp reply not got.

To solve this issue, introducing "mode-gpios" in DT when gpio
based muxing is required. This will throw a warning when gpio
get fails and returns probe defer. When gpio-pcf857x module is
installed, cpsw probes again and ethernet becomes functional.
Verified this on DRA72x with pcf as module and ramdisk.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agoMerge branch 'dsa-mv88e6xxx-ATU'
David S. Miller [Tue, 15 Sep 2015 19:04:22 +0000 (12:04 -0700)]
Merge branch 'dsa-mv88e6xxx-ATU'

Vivien Didelot says:

====================
net: dsa: mv88e6xxx: improve ATU move operations

This patchset completes the set of available Address Translation Unit
operations.

These Marvell switches have 4 operations to flush or (re)move, all or
only non-static MAC addresses, from the entire set of databases or from
just a particular one.

The first 3 patches introduce a generic _mv88e6xxx_atu_flush_move
function. The 4 remaining patches update a few FID operations in the
driver on setup, when a port join or leave a VLAN, or change state.

This is a step forward improving the hardware bridging support in DSA
and 88E6352-compatible switches.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: dsa: mv88e6xxx: remove all MACs when disabling a port
Vivien Didelot [Fri, 4 Sep 2015 18:34:16 +0000 (14:34 -0400)]
net: dsa: mv88e6xxx: remove all MACs when disabling a port

When we're moving a port from Learning or Forwarding state to Disabled
or Blocking or Listening state, remove all non-static MAC addresses
mapped to this port in the entire set of databases, not only one.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: dsa: mv88e6xxx: remove addresses when a port leaves a VLAN
Vivien Didelot [Fri, 4 Sep 2015 18:34:15 +0000 (14:34 -0400)]
net: dsa: mv88e6xxx: remove addresses when a port leaves a VLAN

Add a new _mv88e6xxx_atu_move function to prepare the ATU data register
for the move operation. The ports vector will contain the source port
and destination port of the Move operation. If the destination port is
0xF, the MAC addresses mapped to the source port are removed for the
address database(s).

Then add a _mv88e6xxx_atu_remove wrapper to remove the MAC addresses
from a VLAN database that are mapped to a given port, when it leaves it.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: dsa: mv88e6xxx: flush all addresses when adding a VLAN
Vivien Didelot [Fri, 4 Sep 2015 18:34:14 +0000 (14:34 -0400)]
net: dsa: mv88e6xxx: flush all addresses when adding a VLAN

When choosing an address database for a new VLAN, flush every entries,
not only the non-static ones.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: dsa: mv88e6xxx: flush ATU on initial setup
Vivien Didelot [Fri, 4 Sep 2015 18:34:13 +0000 (14:34 -0400)]
net: dsa: mv88e6xxx: flush ATU on initial setup

Purge all MAC addresses from the entire set of address databases when
the driver initializes the device.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: dsa: mv88e6xxx: rework ATU Flush operation
Vivien Didelot [Fri, 4 Sep 2015 18:34:12 +0000 (14:34 -0400)]
net: dsa: mv88e6xxx: rework ATU Flush operation

These Marvell switches have 4 operations to flush or (re)move, all or
only non-static MAC addresses, from the entire set of databases or from
just a particular one.

The value of the EntryState bits will determine if the operation is
either a Flush (0x0) or a Move (0xF).

When moving entries from one port to another, entries will be removed if
the destination port is 0xF.

This patch renames these operations for consistency, add a new generic
_mv88e6xxx_atu_flush_move function, and change _mv88e6xxx_flush_fid to
use it.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: dsa: mv88e6xxx: extract ATU data write access
Vivien Didelot [Fri, 4 Sep 2015 18:34:11 +0000 (14:34 -0400)]
net: dsa: mv88e6xxx: extract ATU data write access

Other ATU commands need to write the ATU data register. To ease the
introduction of such commands, extract the ATU data write access from
_mv88e6xxx_atu_load to its own function.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: dsa: mv88e6xxx: extract FID write from ATU command
Vivien Didelot [Fri, 4 Sep 2015 18:34:10 +0000 (14:34 -0400)]
net: dsa: mv88e6xxx: extract FID write from ATU command

Not every ATU commands apply to an FID, thus remove the FID writing from
mv88e6xxx_atu_cmd and write it explicitly where needed, in order to ease
introduction of such commands.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: Allow user to get table id from route lookup
David Ahern [Wed, 2 Sep 2015 20:58:36 +0000 (13:58 -0700)]
net: Allow user to get table id from route lookup

rt_fill_info which is called for 'route get' requests hardcodes the
table id as RT_TABLE_MAIN which is not correct when multiple tables
are used. Use the newly added table id in the rtable to send back
the correct table similar to what is done for IPv6.

To maintain current ABI a new request flag, RTM_F_LOOKUP_TABLE, is
added to indicate the actual table is wanted versus the hardcoded
response.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: Add FIB table id to rtable
David Ahern [Wed, 2 Sep 2015 20:58:35 +0000 (13:58 -0700)]
net: Add FIB table id to rtable

Add the FIB table id to rtable to make the information available for
IPv4 as it is for IPv6.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agonet: Refactor rtable initialization
David Ahern [Wed, 2 Sep 2015 20:58:34 +0000 (13:58 -0700)]
net: Refactor rtable initialization

All callers to rt_dst_alloc have nearly the same initialization following
a successful allocation. Consolidate it into rt_dst_alloc.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9 years agoMerge tag 'sound-fix-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Fri, 11 Sep 2015 16:42:32 +0000 (09:42 -0700)]
Merge tag 'sound-fix-4.3-rc1' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "A collection of small fixes since the last update: the HD-audio quirks
  as usual with a USB-audio fix and a trivial fix for the old sparc
  driver"

* tag 'sound-fix-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: usb-audio: Change internal PCM order
  ALSA: hda - Fix white noise on Dell M3800
  ALSA: hda - Use ALC880_FIXUP_FUJITSU for FSC Amilo M1437
  ALSA: hda - Enable headphone jack detect on old Fujitsu laptops
  ALSA: sparc: amd7930: Fix module autoload for OF platform driver
  ALSA: hda - Add some FIXUP quirks for white noise on Dell laptop.

9 years agoMerge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Fri, 11 Sep 2015 16:35:56 +0000 (09:35 -0700)]
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "Just a bunch of fixes to squeeze in before -rc1:

   - three nouveau regression fixes

   - one qxl regression fix

   - a bunch of i915 fixes

  ... and some core displayport/atomic fixes"

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
  drm/nouveau/device: enable c800 quirk for tecra w50
  drm/nouveau/clk/gt215: Unbreak engine pausing for GT21x/MCP7x
  drm/nouveau/gr/nv04: fix big endian setting on gr context
  drm/qxl: validate monitors config modes
  drm/i915: Allow DSI dual link to be configured on any pipe
  drm/i915: Don't try to use DDR DVFS on CHV when disabled in the BIOS
  drm/i915: Fix CSR MMIO address check
  drm/i915: Limit the number of loops for reading a split 64bit register
  drm/i915: Fix broken mst get_hw_state.
  drm/i915: Pass hpd_status_i915[] to intel_get_hpd_pins() in pre-g4x
  uapi/drm/i915_drm.h: fix userspace compilation.
  drm/i915: Always mark the object as dirty when used by the GPU
  drm/dp: Add dp_aux_i2c_speed_khz module param to set the assume i2c bus speed
  drm/dp: Adjust i2c-over-aux retry count based on message size and i2c bus speed
  drm/dp: Define AUX_RETRY_INTERVAL as 500 us
  drm/atomic: Fix bookkeeping with TEST_ONLY, v3.

9 years agoMerge branch 'linux-4.3' of git://anongit.freedesktop.org/git/nouveau/linux-2.6 into...
Dave Airlie [Fri, 11 Sep 2015 04:38:36 +0000 (14:38 +1000)]
Merge branch 'linux-4.3' of git://anongit.freedesktop.org/git/nouveau/linux-2.6 into drm-next

three nouveau regression fixes.
* 'linux-4.3' of git://anongit.freedesktop.org/git/nouveau/linux-2.6:
  drm/nouveau/device: enable c800 quirk for tecra w50
  drm/nouveau/clk/gt215: Unbreak engine pausing for GT21x/MCP7x
  drm/nouveau/gr/nv04: fix big endian setting on gr context

9 years agoMerge branch 'for-4.3/blkcg' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 11 Sep 2015 01:56:14 +0000 (18:56 -0700)]
Merge branch 'for-4.3/blkcg' of git://git.kernel.dk/linux-block

Pull blk-cg updates from Jens Axboe:
 "A bit later in the cycle, but this has been in the block tree for a a
  while.  This is basically four patchsets from Tejun, that improve our
  buffered cgroup writeback.  It was dependent on the other cgroup
  changes, but they went in earlier in this cycle.

  Series 1 is set of 5 patches that has cgroup writeback updates:

   - bdi_writeback iteration fix which could lead to some wb's being
     skipped or repeated during e.g. sync under memory pressure.

   - Simplification of wb work wait mechanism.

   - Writeback tracepoints updated to report cgroup.

  Series 2 is is a set of updates for the CFQ cgroup writeback handling:

     cfq has always charged all async IOs to the root cgroup.  It didn't
     have much choice as writeback didn't know about cgroups and there
     was no way to tell who to blame for a given writeback IO.
     writeback finally grew support for cgroups and now tags each
     writeback IO with the appropriate cgroup to charge it against.

     This patchset updates cfq so that it follows the blkcg each bio is
     tagged with.  Async cfq_queues are now shared across cfq_group,
     which is per-cgroup, instead of per-request_queue cfq_data.  This
     makes all IOs follow the weight based IO resource distribution
     implemented by cfq.

     - Switched from GFP_ATOMIC to GFP_NOWAIT as suggested by Jeff.

     - Other misc review points addressed, acks added and rebased.

  Series 3 is the blkcg policy cleanup patches:

     This patchset contains assorted cleanups for blkcg_policy methods
     and blk[c]g_policy_data handling.

     - alloc/free added for blkg_policy_data.  exit dropped.

     - alloc/free added for blkcg_policy_data.

     - blk-throttle's async percpu allocation is replaced with direct
       allocation.

     - all methods now take blk[c]g_policy_data instead of blkcg_gq or
       blkcg.

  And finally, series 4 is a set of patches cleaning up the blkcg stats
  handling:

    blkcg's stats have always been somwhat of a mess.  This patchset
    tries to improve the situation a bit.

     - The following patches added to consolidate blkcg entry point and
       blkg creation.  This is in itself is an improvement and helps
       colllecting common stats on bio issue.

     - per-blkg stats now accounted on bio issue rather than request
       completion so that bio based and request based drivers can behave
       the same way.  The issue was spotted by Vivek.

     - cfq-iosched implements custom recursive stats and blk-throttle
       implements custom per-cpu stats.  This patchset make blkcg core
       support both by default.

     - cfq-iosched and blk-throttle keep track of the same stats
       multiple times.  Unify them"

* 'for-4.3/blkcg' of git://git.kernel.dk/linux-block: (45 commits)
  blkcg: use CGROUP_WEIGHT_* scale for io.weight on the unified hierarchy
  blkcg: s/CFQ_WEIGHT_*/CFQ_WEIGHT_LEGACY_*/
  blkcg: implement interface for the unified hierarchy
  blkcg: misc preparations for unified hierarchy interface
  blkcg: separate out tg_conf_updated() from tg_set_conf()
  blkcg: move body parsing from blkg_conf_prep() to its callers
  blkcg: mark existing cftypes as legacy
  blkcg: rename subsystem name from blkio to io
  blkcg: refine error codes returned during blkcg configuration
  blkcg: remove unnecessary NULL checks from __cfqg_set_weight_device()
  blkcg: reduce stack usage of blkg_rwstat_recursive_sum()
  blkcg: remove cfqg_stats->sectors
  blkcg: move io_service_bytes and io_serviced stats into blkcg_gq
  blkcg: make blkg_[rw]stat_recursive_sum() to be able to index into blkcg_gq
  blkcg: make blkcg_[rw]stat per-cpu
  blkcg: add blkg_[rw]stat->aux_cnt and replace cfq_group->dead_stats with it
  blkcg: consolidate blkg creation in blkcg_bio_issue_check()
  blk-throttle: improve queue bypass handling
  blkcg: move root blkg lookup optimization from throtl_lookup_tg() to __blkg_lookup()
  blkcg: inline [__]blkg_lookup()
  ...

9 years agodrm/nouveau/device: enable c800 quirk for tecra w50
Ben Skeggs [Thu, 3 Sep 2015 02:39:45 +0000 (12:39 +1000)]
drm/nouveau/device: enable c800 quirk for tecra w50

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
9 years agodrm/nouveau/clk/gt215: Unbreak engine pausing for GT21x/MCP7x
Roy Spliet [Wed, 2 Sep 2015 22:21:02 +0000 (23:21 +0100)]
drm/nouveau/clk/gt215: Unbreak engine pausing for GT21x/MCP7x

Typo that snuck in with commit 6979c6303a4abf263753cd9d577d79f05c6e8c47

Signed-off-by: Roy Spliet <rspliet@eclipso.eu>
Reported-by: Pierre Moreau <pierre.morrow@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
9 years agodrm/nouveau/gr/nv04: fix big endian setting on gr context
Ilia Mirkin [Tue, 1 Sep 2015 02:50:28 +0000 (22:50 -0400)]
drm/nouveau/gr/nv04: fix big endian setting on gr context

Broken since "gr: convert user classes to new-style nvkm_object"

Tested on a PPC64 G5 + NV34

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
9 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Fri, 11 Sep 2015 01:19:42 +0000 (18:19 -0700)]
Merge branch 'akpm' (patches from Andrew)

Merge third patch-bomb from Andrew Morton:

 - even more of the rest of MM

 - lib/ updates

 - checkpatch updates

 - small changes to a few scruffy filesystems

 - kmod fixes/cleanups

 - kexec updates

 - a dma-mapping cleanup series from hch

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (81 commits)
  dma-mapping: consolidate dma_set_mask
  dma-mapping: consolidate dma_supported
  dma-mapping: cosolidate dma_mapping_error
  dma-mapping: consolidate dma_{alloc,free}_noncoherent
  dma-mapping: consolidate dma_{alloc,free}_{attrs,coherent}
  mm: use vma_is_anonymous() in create_huge_pmd() and wp_huge_pmd()
  mm: make sure all file VMAs have ->vm_ops set
  mm, mpx: add "vm_flags_t vm_flags" arg to do_mmap_pgoff()
  mm: mark most vm_operations_struct const
  namei: fix warning while make xmldocs caused by namei.c
  ipc: convert invalid scenarios to use WARN_ON
  zlib_deflate/deftree: remove bi_reverse()
  lib/decompress_unlzma: Do a NULL check for pointer
  lib/decompressors: use real out buf size for gunzip with kernel
  fs/affs: make root lookup from blkdev logical size
  sysctl: fix int -> unsigned long assignments in INT_MIN case
  kexec: export KERNEL_IMAGE_SIZE to vmcoreinfo
  kexec: align crash_notes allocation to make it be inside one physical page
  kexec: remove unnecessary test in kimage_alloc_crash_control_pages()
  kexec: split kexec_load syscall from kexec core code
  ...

9 years agoMerge tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Linus Torvalds [Fri, 11 Sep 2015 00:59:04 +0000 (17:59 -0700)]
Merge tag 'armsoc-late' of git://git./linux/kernel/git/arm/arm-soc

Pull late ARM SoC updates from Kevin Hilman:
 "This is a collection of a few late fixes and other misc stuff that had
  dependencies on things being merged from other trees.

  The bulk of the changes are for samsung/exynos SoCs for some changes
  that needed a few minor reworks so ended up a bit late.  The others
  are mainly for qcom SoCs: a couple fixes and some DTS updates"

* tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (37 commits)
  ARM: multi_v7_defconfig: Enable PBIAS regulator
  soc: qcom: smd: Correct fBLOCKREADINTR handling
  soc: qcom: smd: Use correct remote processor ID
  soc: qcom: smem: Fix errant private access
  ARM: dts: qcom: msm8974-sony-xperia-honami: Use stdout-path
  ARM: dts: qcom: msm8960-cdp: Use stdout-path
  ARM: dts: qcom: msm8660-surf: Use stdout-path
  ARM: dts: qcom: ipq8064-ap148: Use stdout-path
  ARM: dts: qcom: apq8084-mtp: Use stdout-path
  ARM: dts: qcom: apq8084-ifc6540: Use stdout-path
  ARM: dts: qcom: apq8074-dragonboard: Use stdout-path
  ARM: dts: qcom: apq8064-ifc6410: Use stdout-path
  ARM: dts: qcom: apq8064-cm-qs600: Use stdout-path
  ARM: dts: qcom: Label serial nodes for aliasing and stdout-path
  reset: ath79: Fix missing spin_lock_init
  reset: Add (devm_)reset_control_get stub functions
  ARM: EXYNOS: switch to using generic cpufreq driver for exynos4x12
  cpufreq: exynos: Remove unselectable rule for arm-exynos-cpufreq.o
  ARM: dts: add iommu property to JPEG device for exynos4
  ARM: dts: enable SPI1 for exynos4412-odroidu3
  ...

9 years agoMerge tag 'topic/drm-fixes-2015-09-09' of git://anongit.freedesktop.org/drm-intel...
Dave Airlie [Fri, 11 Sep 2015 00:52:37 +0000 (10:52 +1000)]
Merge tag 'topic/drm-fixes-2015-09-09' of git://anongit.freedesktop.org/drm-intel into drm-next

bunch of drm fixes.

* tag 'topic/drm-fixes-2015-09-09' of git://anongit.freedesktop.org/drm-intel:
  drm/dp: Add dp_aux_i2c_speed_khz module param to set the assume i2c bus speed
  drm/dp: Adjust i2c-over-aux retry count based on message size and i2c bus speed
  drm/dp: Define AUX_RETRY_INTERVAL as 500 us
  drm/atomic: Fix bookkeeping with TEST_ONLY, v3.

9 years agoMerge tag 'drm-intel-next-fixes-2015-09-10' of git://anongit.freedesktop.org/drm...
Dave Airlie [Fri, 11 Sep 2015 00:52:08 +0000 (10:52 +1000)]
Merge tag 'drm-intel-next-fixes-2015-09-10' of git://anongit.freedesktop.org/drm-intel into drm-next

Fixes headed for v4.3-rc1, including Maarten's DP MST state checker fix
you requested.

* tag 'drm-intel-next-fixes-2015-09-10' of git://anongit.freedesktop.org/drm-intel:
  drm/i915: Allow DSI dual link to be configured on any pipe
  drm/i915: Don't try to use DDR DVFS on CHV when disabled in the BIOS
  drm/i915: Fix CSR MMIO address check
  drm/i915: Limit the number of loops for reading a split 64bit register
  drm/i915: Fix broken mst get_hw_state.
  drm/i915: Pass hpd_status_i915[] to intel_get_hpd_pins() in pre-g4x
  uapi/drm/i915_drm.h: fix userspace compilation.
  drm/i915: Always mark the object as dirty when used by the GPU

9 years agodrm/qxl: validate monitors config modes
Jonathon Jongsma [Thu, 20 Aug 2015 19:04:32 +0000 (14:04 -0500)]
drm/qxl: validate monitors config modes

Due to some recent changes in
drm_helper_probe_single_connector_modes_merge_bits(), old custom modes
were not being pruned properly. In current kernels,
drm_mode_validate_basic() is called to sanity-check each mode in the
list. If the sanity-check passes, the mode's status gets set to to
MODE_OK. In older kernels this check was not done, so old custom modes
would still have a status of MODE_UNVERIFIED at this point, and would
therefore be pruned later in the function.

As a result of this new behavior, the list of modes for a device always
includes every custom mode ever configured for the device, with the
largest one listed first. Since desktop environments usually choose the
first preferred mode when a hotplug event is emitted, this had the
result of making it very difficult for the user to reduce the size of
the display.

The qxl driver did implement the mode_valid connector function, but it
was empty. In order to restore the old behavior where old custom modes
are pruned, we implement a proper mode_valid function for the qxl
driver. This function now checks each mode against the last configured
custom mode and the list of standard modes. If the mode doesn't match
any of these, its status is set to MODE_BAD so that it will be pruned as
expected.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
9 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Thu, 10 Sep 2015 23:42:49 +0000 (16:42 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull more kvm updates from Paolo Bonzini:
 "ARM:
   - Full debug support for arm64
   - Active state switching for timer interrupts
   - Lazy FP/SIMD save/restore for arm64
   - Generic ARMv8 target

  PPC:
   - Book3S: A few bug fixes
   - Book3S: Allow micro-threading on POWER8

  x86:
   - Compiler warnings

  Generic:
   - Adaptive polling for guest halt"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (49 commits)
  kvm: irqchip: fix memory leak
  kvm: move new trace event outside #ifdef CONFIG_KVM_ASYNC_PF
  KVM: trace kvm_halt_poll_ns grow/shrink
  KVM: dynamic halt-polling
  KVM: make halt_poll_ns per-vCPU
  Silence compiler warning in arch/x86/kvm/emulate.c
  kvm: compile process_smi_save_seg_64() only for x86_64
  KVM: x86: avoid uninitialized variable warning
  KVM: PPC: Book3S: Fix typo in top comment about locking
  KVM: PPC: Book3S: Fix size of the PSPB register
  KVM: PPC: Book3S HV: Exit on H_DOORBELL if HOST_IPI is set
  KVM: PPC: Book3S HV: Fix race in starting secondary threads
  KVM: PPC: Book3S: correct width in XER handling
  KVM: PPC: Book3S HV: Fix preempted vcore stolen time calculation
  KVM: PPC: Book3S HV: Fix preempted vcore list locking
  KVM: PPC: Book3S HV: Implement H_CLEAR_REF and H_CLEAR_MOD
  KVM: PPC: Book3S HV: Fix bug in dirty page tracking
  KVM: PPC: Book3S HV: Fix race in reading change bit when removing HPTE
  KVM: PPC: Book3S HV: Implement dynamic micro-threading on POWER8
  KVM: PPC: Book3S HV: Make use of unused threads when running guests
  ...

9 years agoMerge tag 'for-linus-4.3-rc0b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Thu, 10 Sep 2015 23:21:11 +0000 (16:21 -0700)]
Merge tag 'for-linus-4.3-rc0b-tag' of git://git./linux/kernel/git/xen/tip

Pull xen terminology fixes from David Vrabel:
 "Use the correct GFN/BFN terms more consistently"

* tag 'for-linus-4.3-rc0b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/xenbus: Rename the variable xen_store_mfn to xen_store_gfn
  xen/privcmd: Further s/MFN/GFN/ clean-up
  hvc/xen: Further s/MFN/GFN clean-up
  video/xen-fbfront: Further s/MFN/GFN clean-up
  xen/tmem: Use xen_page_to_gfn rather than pfn_to_gfn
  xen: Use correctly the Xen memory terminologies
  arm/xen: implement correctly pfn_to_mfn
  xen: Make clear that swiotlb and biomerge are dealing with DMA address

9 years agoMerge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze
Linus Torvalds [Thu, 10 Sep 2015 23:20:00 +0000 (16:20 -0700)]
Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze

Pull microblaze update from Michal Simek.

* 'next' of git://git.monstr.eu/linux-2.6-microblaze:
  elf-em.h: move EM_MICROBLAZE to the common header

9 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rkuo/linux...
Linus Torvalds [Thu, 10 Sep 2015 23:19:07 +0000 (16:19 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/rkuo/linux-hexagon-kernel

Pull hexagon updates from Richard Kuo:
 "Just two fixes -- one for a uapi header and one for a timer interface"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rkuo/linux-hexagon-kernel:
  Revert "Hexagon: fix signal.c compile error"
  hexagon/time: Migrate to new 'set-state' interface

9 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Thu, 10 Sep 2015 20:53:15 +0000 (13:53 -0700)]
Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) Fix out-of-bounds array access in netfilter ipset, from Jozsef
    Kadlecsik.

 2) Use correct free operation on netfilter conntrack templates, from
    Daniel Borkmann.

 3) Fix route leak in SCTP, from Marcelo Ricardo Leitner.

 4) Fix sizeof(pointer) in mac80211, from Thierry Reding.

 5) Fix cache pointer comparison in ip6mr leading to missed unlock of
    mrt_lock.  From Richard Laing.

 6) rds_conn_lookup() needs to consider network namespace in key
    comparison, from Sowmini Varadhan.

 7) Fix deadlock in TIPC code wrt broadcast link wakeups, from Kolmakov
    Dmitriy.

 8) Fix fd leaks in bpf syscall, from Daniel Borkmann.

 9) Fix error recovery when installing ipv6 multipath routes, we would
    delete the old route before we would know if we could fully commit
    to the new set of nexthops.  Fix from Roopa Prabhu.

10) Fix run-time suspend problems in r8152, from Hayes Wang.

11) In fec, don't program the MAC address into the chip when the clocks
    are gated off.  From Fugang Duan.

12) Fix poll behavior for netlink sockets when using rx ring mmap, from
    Daniel Borkmann.

13) Don't allocate memory with GFP_KERNEL from get_stats64 in r8169
    driver, from Corinna Vinschen.

14) In TCP Cubic congestion control, handle idle periods better where we
    are application limited, in order to keep cwnd from growing out of
    control.  From Eric Dumzet.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (65 commits)
  tcp_cubic: better follow cubic curve after idle period
  tcp: generate CA_EVENT_TX_START on data frames
  xen-netfront: respect user provided max_queues
  xen-netback: respect user provided max_queues
  r8169: Fix sleeping function called during get_stats64, v2
  ether: add IEEE 1722 ethertype - TSN
  netlink, mmap: fix edge-case leakages in nf queue zero-copy
  netlink, mmap: don't walk rx ring on poll if receive queue non-empty
  cxgb4: changes for new firmware 1.14.4.0
  net: fec: add netif status check before set mac address
  r8152: fix the runtime suspend issues
  r8152: split DRIVER_VERSION
  ipv6: fix ifnullfree.cocci warnings
  add microchip LAN88xx phy driver
  stmmac: fix check for phydev being open
  net: qlcnic: delete redundant memsets
  net: mv643xx_eth: use kzalloc
  net: jme: use kzalloc() instead of kmalloc+memset
  net: cavium: liquidio: use kzalloc in setup_glist()
  net: ipv6: use common fib_default_rule_pref
  ...

9 years agodma-mapping: consolidate dma_set_mask
Christoph Hellwig [Wed, 9 Sep 2015 22:39:53 +0000 (15:39 -0700)]
dma-mapping: consolidate dma_set_mask

Almost everyone implements dma_set_mask the same way, although some time
that's hidden in ->set_dma_mask methods.

This patch consolidates those into a common implementation that either
calls ->set_dma_mask if present or otherwise uses the default
implementation.  Some architectures used to only call ->set_dma_mask
after the initial checks, and those instance have been fixed to do the
full work.  h8300 implemented dma_set_mask bogusly as a no-ops and has
been fixed.

Unfortunately some architectures overload unrelated semantics like changing
the dma_ops into it so we still need to allow for an architecture override
for now.

[jcmvbkbc@gmail.com: fix xtensa]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agodma-mapping: consolidate dma_supported
Christoph Hellwig [Wed, 9 Sep 2015 22:39:49 +0000 (15:39 -0700)]
dma-mapping: consolidate dma_supported

Most architectures just call into ->dma_supported, but some also return 1
if the method is not present, or 0 if no dma ops are present (although
that should never happeb). Consolidate this more broad version into
common code.

Also fix h8300 which inorrectly always returned 0, which would have been
a problem if it's dma_set_mask implementation wasn't a similarly buggy
noop.

As a few architectures have much more elaborate implementations, we
still allow for arch overrides.

[jcmvbkbc@gmail.com: fix xtensa]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agodma-mapping: cosolidate dma_mapping_error
Christoph Hellwig [Wed, 9 Sep 2015 22:39:46 +0000 (15:39 -0700)]
dma-mapping: cosolidate dma_mapping_error

Currently there are three valid implementations of dma_mapping_error:

 (1) call ->mapping_error
 (2) check for a hardcoded error code
 (3) always return 0

This patch provides a common implementation that calls ->mapping_error
if present, then checks for DMA_ERROR_CODE if defined or otherwise
returns 0.

[jcmvbkbc@gmail.com: fix xtensa]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agodma-mapping: consolidate dma_{alloc,free}_noncoherent
Christoph Hellwig [Wed, 9 Sep 2015 22:39:42 +0000 (15:39 -0700)]
dma-mapping: consolidate dma_{alloc,free}_noncoherent

Most architectures do not support non-coherent allocations and either
define dma_{alloc,free}_noncoherent to their coherent versions or stub
them out.

Openrisc uses dma_{alloc,free}_attrs to implement them, and only Mips
implements them directly.

This patch moves the Openrisc version to common code, and handles the
DMA_ATTR_NON_CONSISTENT case in the mips dma_map_ops instance.

Note that actual non-coherent allocations require a dma_cache_sync
implementation, so if non-coherent allocations didn't work on
an architecture before this patch they still won't work after it.

[jcmvbkbc@gmail.com: fix xtensa]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agodma-mapping: consolidate dma_{alloc,free}_{attrs,coherent}
Christoph Hellwig [Wed, 9 Sep 2015 22:39:39 +0000 (15:39 -0700)]
dma-mapping: consolidate dma_{alloc,free}_{attrs,coherent}

Since 2009 we have a nice asm-generic header implementing lots of DMA API
functions for architectures using struct dma_map_ops, but unfortunately
it's still missing a lot of APIs that all architectures still have to
duplicate.

This series consolidates the remaining functions, although we still need
arch opt outs for two of them as a few architectures have very
non-standard implementations.

This patch (of 5):

The coherent DMA allocator works the same over all architectures supporting
dma_map operations.

This patch consolidates them and converges the minor differences:

 - the debug_dma helpers are now called from all architectures, including
   those that were previously missing them
 - dma_alloc_from_coherent and dma_release_from_coherent are now always
   called from the generic alloc/free routines instead of the ops
   dma-mapping-common.h always includes dma-coherent.h to get the defintions
   for them, or the stubs if the architecture doesn't support this feature
 - checks for ->alloc / ->free presence are removed.  There is only one
   magic instead of dma_map_ops without them (mic_dma_ops) and that one
   is x86 only anyway.

Besides that only x86 needs special treatment to replace a default devices
if none is passed and tweak the gfp_flags.  An optional arch hook is provided
for that.

[linux@roeck-us.net: fix build]
[jcmvbkbc@gmail.com: fix xtensa]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agomm: use vma_is_anonymous() in create_huge_pmd() and wp_huge_pmd()
Kirill A. Shutemov [Wed, 9 Sep 2015 22:39:35 +0000 (15:39 -0700)]
mm: use vma_is_anonymous() in create_huge_pmd() and wp_huge_pmd()

Let's use helper rather than direct check of vma->vm_ops to distinguish
anonymous VMA.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agomm: make sure all file VMAs have ->vm_ops set
Kirill A. Shutemov [Wed, 9 Sep 2015 22:39:32 +0000 (15:39 -0700)]
mm: make sure all file VMAs have ->vm_ops set

We rely on vma->vm_ops == NULL to detect anonymous VMA: see
vma_is_anonymous(), but some drivers doesn't set ->vm_ops.

As a result we can end up with anonymous page in private file mapping.
That should not lead to serious misbehaviour, but nevertheless is wrong.

Let's fix by setting up dummy ->vm_ops for file mmapping if f_op->mmap()
didn't set its own.

The patch also adds sanity check into __vma_link_rb(). It will help
catch broken VMAs which inserted directly into mm_struct via
insert_vm_struct().

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agomm, mpx: add "vm_flags_t vm_flags" arg to do_mmap_pgoff()
Oleg Nesterov [Wed, 9 Sep 2015 22:39:29 +0000 (15:39 -0700)]
mm, mpx: add "vm_flags_t vm_flags" arg to do_mmap_pgoff()

Add the additional "vm_flags_t vm_flags" argument to do_mmap_pgoff(),
rename it to do_mmap(), and re-introduce do_mmap_pgoff() as a simple
wrapper on top of do_mmap().  Perhaps we should update the callers of
do_mmap_pgoff() and kill it later.

This way mpx_mmap() can simply call do_mmap(vm_flags => VM_MPX) and do not
play with vm internals.

After this change mmap_region() has a single user outside of mmap.c,
arch/tile/mm/elf.c:arch_setup_additional_pages().  It would be nice to
change arch/tile/ and unexport mmap_region().

[kirill@shutemov.name: fix build]
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agomm: mark most vm_operations_struct const
Kirill A. Shutemov [Wed, 9 Sep 2015 22:39:26 +0000 (15:39 -0700)]
mm: mark most vm_operations_struct const

With two exceptions (drm/qxl and drm/radeon) all vm_operations_struct
structs should be constant.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agonamei: fix warning while make xmldocs caused by namei.c
Masanari Iida [Wed, 9 Sep 2015 22:39:23 +0000 (15:39 -0700)]
namei: fix warning while make xmldocs caused by namei.c

Fix the following warnings:

Warning(.//fs/namei.c:2422): No description found for parameter 'nd'
Warning(.//fs/namei.c:2422): Excess function parameter 'nameidata'
description in 'path_mountpoint'

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agoipc: convert invalid scenarios to use WARN_ON
Davidlohr Bueso [Wed, 9 Sep 2015 22:39:20 +0000 (15:39 -0700)]
ipc: convert invalid scenarios to use WARN_ON

Considering Linus' past rants about the (ab)use of BUG in the kernel, I
took a look at how we deal with such calls in ipc.  Given that any errors
or corruption in ipc code are most likely contained within the set of
processes participating in the broken mechanisms, there aren't really many
strong fatal system failure scenarios that would require a BUG call.
Also, if something is seriously wrong, ipc might not be the place for such
a BUG either.

1. For example, recently, a customer hit one of these BUG_ONs in shm
   after failing shm_lock().  A busted ID imho does not merit a BUG_ON,
   and WARN would have been better.

2. MSG_COPY functionality of posix msgrcv(2) for checkpoint/restore.
   I don't see how we can hit this anyway -- at least it should be IS_ERR.
    The 'copy' arg from do_msgrcv is always set by calling prepare_copy()
   first and foremost.  We could also probably drop this check altogether.
    Either way, it does not merit a BUG_ON.

3. No ->fault() callback for the fs getting the corresponding page --
   seems selfish to make the system unusable.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agozlib_deflate/deftree: remove bi_reverse()
yalin wang [Wed, 9 Sep 2015 22:39:18 +0000 (15:39 -0700)]
zlib_deflate/deftree: remove bi_reverse()

Remove bi_reverse() and use generic bitrev32() instead - it should have
better performance on some platforms.

Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agolib/decompress_unlzma: Do a NULL check for pointer
Fabio Estevam [Wed, 9 Sep 2015 22:39:15 +0000 (15:39 -0700)]
lib/decompress_unlzma: Do a NULL check for pointer

Compare pointer-typed values to NULL rather than 0.

The semantic patch that makes this change is available
in scripts/coccinelle/null/badzero.cocci.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agolib/decompressors: use real out buf size for gunzip with kernel
Yinghai Lu [Wed, 9 Sep 2015 22:39:12 +0000 (15:39 -0700)]
lib/decompressors: use real out buf size for gunzip with kernel

When loading x86 64bit kernel above 4GiB with patched grub2, got kernel
gunzip error.

| early console in decompress_kernel
| decompress_kernel:
|       input: [0x807f2143b4-0x807ff61aee]
|      output: [0x807cc00000-0x807f3ea29b] 0x027ea29c: output_len
| boot via startup_64
| KASLR using RDTSC...
|  new output: [0x46fe000000-0x470138cfff] 0x0338d000: output_run_size
|  decompress: [0x46fe000000-0x47007ea29b] <=== [0x807f2143b4-0x807ff61aee]
|
| Decompressing Linux... gz...
|
| uncompression error
|
| -- System halted

the new buffer is at 0x46fe000000ULL, decompressor_gzip is using
0xffffffb901ffffff as out_len.  gunzip in lib/zlib_inflate/inflate.c cap
that len to 0x01ffffff and decompress fails later.

We could hit this problem with crashkernel booting that uses kexec loading
kernel above 4GiB.

We have decompress_* support:
    1. inbuf[]/outbuf[] for kernel preboot.
    2. inbuf[]/flush() for initramfs
    3. fill()/flush() for initrd.
This bug only affect kernel preboot path that use outbuf[].

Add __decompress and take real out_buf_len for gunzip instead of guessing
wrong buf size.

Fixes: 1431574a1c4 (lib/decompressors: fix "no limit" output buffer length)
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Alexandre Courbot <acourbot@nvidia.com>
Cc: Jon Medhurst <tixy@linaro.org>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agofs/affs: make root lookup from blkdev logical size
Pranay Kr. Srivastava [Wed, 9 Sep 2015 22:39:09 +0000 (15:39 -0700)]
fs/affs: make root lookup from blkdev logical size

This patch resolves https://bugzilla.kernel.org/show_bug.cgi?id=16531.

When logical blkdev size > 512 then sector numbers become larger than the
device can support.

Make affs start lookup based on the device's logical sector size instead
of 512.

Reported-by: Mark <markk@clara.co.uk>
Suggested-by: Mark <markk@clara.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agosysctl: fix int -> unsigned long assignments in INT_MIN case
Ilya Dryomov [Wed, 9 Sep 2015 22:39:06 +0000 (15:39 -0700)]
sysctl: fix int -> unsigned long assignments in INT_MIN case

The following

    if (val < 0)
        *lvalp = (unsigned long)-val;

is incorrect because the compiler is free to assume -val to be positive
and use a sign-extend instruction for extending the bit pattern.  This is
a problem if val == INT_MIN:

    # echo -2147483648 >/proc/sys/dev/scsi/logging_level
    # cat /proc/sys/dev/scsi/logging_level
    -18446744071562067968

Cast to unsigned long before negation - that way we first sign-extend and
then negate an unsigned, which is well defined.  With this:

    # cat /proc/sys/dev/scsi/logging_level
    -2147483648

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Cc: Mikulas Patocka <mikulas@twibright.com>
Cc: Robert Xiao <nneonneo@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokexec: export KERNEL_IMAGE_SIZE to vmcoreinfo
Baoquan He [Wed, 9 Sep 2015 22:39:03 +0000 (15:39 -0700)]
kexec: export KERNEL_IMAGE_SIZE to vmcoreinfo

In x86_64, since v2.6.26 the KERNEL_IMAGE_SIZE is changed to 512M, and
accordingly the MODULES_VADDR is changed to 0xffffffffa0000000.  However,
in v3.12 Kees Cook introduced kaslr to randomise the location of kernel.
And the kernel text mapping addr space is enlarged from 512M to 1G.  That
means now KERNEL_IMAGE_SIZE is variable, its value is 512M when kaslr
support is not compiled in and 1G when kaslr support is compiled in.
Accordingly the MODULES_VADDR is changed too to be:

    #define MODULES_VADDR    (__START_KERNEL_map + KERNEL_IMAGE_SIZE)

So when kaslr is compiled in and enabled, the kernel text mapping addr
space and modules vaddr space need be adjusted.  Otherwise makedumpfile
will collapse since the addr for some symbols is not correct.

Hence KERNEL_IMAGE_SIZE need be exported to vmcoreinfo and got in
makedumpfile to help calculate MODULES_VADDR.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokexec: align crash_notes allocation to make it be inside one physical page
Baoquan He [Wed, 9 Sep 2015 22:39:00 +0000 (15:39 -0700)]
kexec: align crash_notes allocation to make it be inside one physical page

People reported that crash_notes in /proc/vmcore were corrupted and this
cause crash kdump failure.  With code debugging and log we got the root
cause.  This is because percpu variable crash_notes are allocated in 2
vmalloc pages.  Currently percpu is based on vmalloc by default.  Vmalloc
can't guarantee 2 continuous vmalloc pages are also on 2 continuous
physical pages.  So when 1st kernel exports the starting address and size
of crash_notes through sysfs like below:

/sys/devices/system/cpu/cpux/crash_notes
/sys/devices/system/cpu/cpux/crash_notes_size

kdump kernel use them to get the content of crash_notes.  However the 2nd
part may not be in the next neighbouring physical page as we expected if
crash_notes are allocated accross 2 vmalloc pages.  That's why
nhdr_ptr->n_namesz or nhdr_ptr->n_descsz could be very huge in
update_note_header_size_elf64() and cause note header merging failure or
some warnings.

In this patch change to call __alloc_percpu() to passed in the align value
by rounding crash_notes_size up to the nearest power of two.  This makes
sure the crash_notes is allocated inside one physical page since
sizeof(note_buf_t) in all ARCHS is smaller than PAGE_SIZE.  Meanwhile add
a BUILD_BUG_ON to break compile if size is bigger than PAGE_SIZE since
crash_notes definitely will be in 2 pages.  That need be avoided, and need
be reported if it's unavoidable.

[akpm@linux-foundation.org: use correct comment layout]
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Lisa Mitchell <lisa.mitchell@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokexec: remove unnecessary test in kimage_alloc_crash_control_pages()
Minfei Huang [Wed, 9 Sep 2015 22:38:58 +0000 (15:38 -0700)]
kexec: remove unnecessary test in kimage_alloc_crash_control_pages()

Transforming PFN(Page Frame Number) to struct page is never failure, so we
can simplify the code logic to do the image->control_page assignment
directly in the loop, and remove the unnecessary conditional judgement.

Signed-off-by: Minfei Huang <mnfhuang@gmail.com>
Acked-by: Dave Young <dyoung@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokexec: split kexec_load syscall from kexec core code
Dave Young [Wed, 9 Sep 2015 22:38:55 +0000 (15:38 -0700)]
kexec: split kexec_load syscall from kexec core code

There are two kexec load syscalls, kexec_load another and kexec_file_load.
 kexec_file_load has been splited as kernel/kexec_file.c.  In this patch I
split kexec_load syscall code to kernel/kexec.c.

And add a new kconfig option KEXEC_CORE, so we can disable kexec_load and
use kexec_file_load only, or vice verse.

The original requirement is from Ted Ts'o, he want kexec kernel signature
being checked with CONFIG_KEXEC_VERIFY_SIG enabled.  But kexec-tools use
kexec_load syscall can bypass the checking.

Vivek Goyal proposed to create a common kconfig option so user can compile
in only one syscall for loading kexec kernel.  KEXEC/KEXEC_FILE selects
KEXEC_CORE so that old config files still work.

Because there's general code need CONFIG_KEXEC_CORE, so I updated all the
architecture Kconfig with a new option KEXEC_CORE, and let KEXEC selects
KEXEC_CORE in arch Kconfig.  Also updated general kernel code with to
kexec_load syscall.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Dave Young <dyoung@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Petr Tesarik <ptesarik@suse.cz>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Josh Boyer <jwboyer@fedoraproject.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokexec: split kexec_file syscall code to kexec_file.c
Dave Young [Wed, 9 Sep 2015 22:38:51 +0000 (15:38 -0700)]
kexec: split kexec_file syscall code to kexec_file.c

Split kexec_file syscall related code to another file kernel/kexec_file.c
so that the #ifdef CONFIG_KEXEC_FILE in kexec.c can be dropped.

Sharing variables and functions are moved to kernel/kexec_internal.h per
suggestion from Vivek and Petr.

[akpm@linux-foundation.org: fix bisectability]
[akpm@linux-foundation.org: declare the various arch_kexec functions]
[akpm@linux-foundation.org: fix build]
Signed-off-by: Dave Young <dyoung@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Petr Tesarik <ptesarik@suse.cz>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Josh Boyer <jwboyer@fedoraproject.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agodrivers/net/wireless/ath/wil6210: use seq_hex_dump() to dump buffers
Andy Shevchenko [Wed, 9 Sep 2015 22:38:48 +0000 (15:38 -0700)]
drivers/net/wireless/ath/wil6210: use seq_hex_dump() to dump buffers

Instead of custom approach let's use recently introduced seq_hex_dump()
helper.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokmemleak: use seq_hex_dump() to dump buffers
Andy Shevchenko [Wed, 9 Sep 2015 22:38:45 +0000 (15:38 -0700)]
kmemleak: use seq_hex_dump() to dump buffers

Instead of custom approach let's use recently introduced seq_hex_dump()
helper.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agodrivers/s390/crypto/zcrypt_api.c: use seq_hex_dump() to dump buffers
Andy Shevchenko [Wed, 9 Sep 2015 22:38:42 +0000 (15:38 -0700)]
drivers/s390/crypto/zcrypt_api.c: use seq_hex_dump() to dump buffers

Instead of custom approach let's use recently introduced seq_hex_dump()
helper.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agoparisc: use seq_hex_dump() to dump buffers
Andy Shevchenko [Wed, 9 Sep 2015 22:38:39 +0000 (15:38 -0700)]
parisc: use seq_hex_dump() to dump buffers

Instead of custom approach let's use recently introduced seq_hex_dump()
helper.

In one case it changes the output from
1111111122222222333333334444444455555555666666667777777788888888
to
11111111 22222222 33333333 44444444 55555555 66666666 77777777 88888888

though it seems it prints same data (by meaning) in both cases.  I decide
to choose to use the space divided one.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Helge Deller <deller@gmx.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agodrivers/crypto/qat: use seq_hex_dump() to dump buffers
Andy Shevchenko [Wed, 9 Sep 2015 22:38:36 +0000 (15:38 -0700)]
drivers/crypto/qat: use seq_hex_dump() to dump buffers

Instead of custom approach let's use recently introduced seq_hex_dump()
helper.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agoseq_file: provide an analogue of print_hex_dump()
Andy Shevchenko [Wed, 9 Sep 2015 22:38:33 +0000 (15:38 -0700)]
seq_file: provide an analogue of print_hex_dump()

This introduces a new helper and switches current users to use it.  All
patches are compiled tested. kmemleak is tested via its own test suite.

This patch (of 6):

The new seq_hex_dump() is a complete analogue of print_hex_dump().

We have few users of this functionality already. It allows to reduce their
codebase.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agofs: Don't dump core if the corefile would become world-readable.
Jann Horn [Wed, 9 Sep 2015 22:38:30 +0000 (15:38 -0700)]
fs: Don't dump core if the corefile would become world-readable.

On a filesystem like vfat, all files are created with the same owner
and mode independent of who created the file. When a vfat filesystem
is mounted with root as owner of all files and read access for everyone,
root's processes left world-readable coredumps on it (but other
users' processes only left empty corefiles when given write access
because of the uid mismatch).

Given that the old behavior was inconsistent and insecure, I don't see
a problem with changing it. Now, all processes refuse to dump core unless
the resulting corefile will only be readable by their owner.

Signed-off-by: Jann Horn <jann@thejh.net>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agofs: if a coredump already exists, unlink and recreate with O_EXCL
Jann Horn [Wed, 9 Sep 2015 22:38:28 +0000 (15:38 -0700)]
fs: if a coredump already exists, unlink and recreate with O_EXCL

It was possible for an attacking user to trick root (or another user) into
writing his coredumps into an attacker-readable, pre-existing file using
rename() or link(), causing the disclosure of secret data from the victim
process' virtual memory.  Depending on the configuration, it was also
possible to trick root into overwriting system files with coredumps.  Fix
that issue by never writing coredumps into existing files.

Requirements for the attack:
 - The attack only applies if the victim's process has a nonzero
   RLIMIT_CORE and is dumpable.
 - The attacker can trick the victim into coredumping into an
   attacker-writable directory D, either because the core_pattern is
   relative and the victim's cwd is attacker-writable or because an
   absolute core_pattern pointing to a world-writable directory is used.
 - The attacker has one of these:
  A: on a system with protected_hardlinks=0:
     execute access to a folder containing a victim-owned,
     attacker-readable file on the same partition as D, and the
     victim-owned file will be deleted before the main part of the attack
     takes place. (In practice, there are lots of files that fulfill
     this condition, e.g. entries in Debian's /var/lib/dpkg/info/.)
     This does not apply to most Linux systems because most distros set
     protected_hardlinks=1.
  B: on a system with protected_hardlinks=1:
     execute access to a folder containing a victim-owned,
     attacker-readable and attacker-writable file on the same partition
     as D, and the victim-owned file will be deleted before the main part
     of the attack takes place.
     (This seems to be uncommon.)
  C: on any system, independent of protected_hardlinks:
     write access to a non-sticky folder containing a victim-owned,
     attacker-readable file on the same partition as D
     (This seems to be uncommon.)

The basic idea is that the attacker moves the victim-owned file to where
he expects the victim process to dump its core.  The victim process dumps
its core into the existing file, and the attacker reads the coredump from
it.

If the attacker can't move the file because he does not have write access
to the containing directory, he can instead link the file to a directory
he controls, then wait for the original link to the file to be deleted
(because the kernel checks that the link count of the corefile is 1).

A less reliable variant that requires D to be non-sticky works with link()
and does not require deletion of the original link: link() the file into
D, but then unlink() it directly before the kernel performs the link count
check.

On systems with protected_hardlinks=0, this variant allows an attacker to
not only gain information from coredumps, but also clobber existing,
victim-writable files with coredumps.  (This could theoretically lead to a
privilege escalation.)

Signed-off-by: Jann Horn <jann@thejh.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokmod: handle UMH_WAIT_PROC from system unbound workqueue
Frederic Weisbecker [Wed, 9 Sep 2015 22:38:25 +0000 (15:38 -0700)]
kmod: handle UMH_WAIT_PROC from system unbound workqueue

The UMH_WAIT_PROC handler runs in its own thread in order to make sure
that waiting for the exec kernel thread completion won't block other
usermodehelper queued jobs.

On older workqueue implementations, worklets couldn't sleep without
blocking the rest of the queue.  But now the workqueue subsystem handles
that.  Khelper still had the older limitation due to its singlethread
properties but we replaced it to system unbound workqueues.

Those are affine to the current node and can block up to some number of
instances.

They are a good candidate to handle UMH_WAIT_PROC assuming that we have
enough system unbound workers to handle lots of parallel usermodehelper
jobs.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokmod: use system_unbound_wq instead of khelper
Frederic Weisbecker [Wed, 9 Sep 2015 22:38:22 +0000 (15:38 -0700)]
kmod: use system_unbound_wq instead of khelper

We need to launch the usermodehelper kernel threads with the widest
affinity and this is partly why we use khelper.  This workqueue has
unbound properties and thus a wide affinity inherited by all its children.

Now khelper also has special properties that we aren't much interested in:
ordered and singlethread.  There is really no need about ordering as all
we do is creating kernel threads.  This can be done concurrently.  And
singlethread is a useless limitation as well.

The workqueue engine already proposes generic unbound workqueues that
don't share these useless properties and handle well parallel jobs.

The only worrysome specific is their affinity to the node of the current
CPU.  It's fine for creating the usermodehelper kernel threads but those
inherit this affinity for longer jobs such as requesting modules.

This patch proposes to use these node affine unbound workqueues assuming
that a node is sufficient to handle several parallel usermodehelper
requests.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokmod: add up-to-date explanations on the purpose of each asynchronous levels
Frederic Weisbecker [Wed, 9 Sep 2015 22:38:19 +0000 (15:38 -0700)]
kmod: add up-to-date explanations on the purpose of each asynchronous levels

There seem to be quite some confusions on the comments, likely due to
changes that came after them.

Now since it's very non obvious why we have 3 levels of asynchronous code
to implement usermodehelpers, it's important to comment in detail the
reason of this layout.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokmod: remove unecessary explicit wide CPU affinity setting
Frederic Weisbecker [Wed, 9 Sep 2015 22:38:16 +0000 (15:38 -0700)]
kmod: remove unecessary explicit wide CPU affinity setting

Khelper is affine to all CPUs.  Now since it creates the
call_usermodehelper_exec_[a]sync() kernel threads, those inherit the wide
affinity.

As such explicitly forcing a wide affinity from those kernel threads
is like a no-op.

Just remove it. It's needless and it breaks CPU isolation users who
rely on workqueue affinity tuning.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokmod: bunch of internal functions renames
Frederic Weisbecker [Wed, 9 Sep 2015 22:38:13 +0000 (15:38 -0700)]
kmod: bunch of internal functions renames

This patchset does a bunch of cleanups and converts khelper to use system
unbound workqueues.  The 3 first patches should be uncontroversial.  The
last 2 patches are debatable.

Kmod creates kernel threads that perform userspace jobs and we want those
to have a large affinity in order not to contend busy CPUs.  This is
(partly) why we use khelper which has a wide affinity that the kernel
threads it create can inherit from.  Now khelper is a dedicated workqueue
that has singlethread properties which we aren't interested in.

Hence those two debatable changes:

_ We would like to use generic workqueues. System unbound workqueues are
  a very good candidate but they are not wide affine, only node affine.
  Now probably a node is enough to perform many parallel kmod jobs.

_ We would like to remove the wait_for_helper kernel thread (UMH_WAIT_PROC
  handler) to use the workqueue. It means that if the workqueue blocks,
  and no other worker can take pending kmod request, we can be screwed.
  Now if we have 512 threads, this should be enough.

This patch (of 5):

Underscores on function names aren't much verbose to explain the purpose
of a function.  And kmod has interesting such flavours.

Lets rename the following functions:

* __call_usermodehelper -> call_usermodehelper_exec_work
* ____call_usermodehelper -> call_usermodehelper_exec_async
* wait_for_helper -> call_usermodehelper_exec_sync

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agokmod: correct documentation of return status of request_module
NeilBrown [Wed, 9 Sep 2015 22:38:10 +0000 (15:38 -0700)]
kmod: correct documentation of return status of request_module

If request_module() successfully runs modprobe, but modprobe exits with a
non-zero status, then the return value from request_module() will be that
(positive) error status.  So the return from request_module can be:

 negative errno
 zero for success
 positive exit code.

Signed-off-by: NeilBrown <neilb@suse.com>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agohfs: fix B-tree corruption after insertion at position 0
Hin-Tak Leung [Wed, 9 Sep 2015 22:38:07 +0000 (15:38 -0700)]
hfs: fix B-tree corruption after insertion at position 0

Fix B-tree corruption when a new record is inserted at position 0 in the
node in hfs_brec_insert().

This is an identical change to the corresponding hfs b-tree code to Sergei
Antonov's "hfsplus: fix B-tree corruption after insertion at position 0",
to keep similar code paths in the hfs and hfsplus drivers in sync, where
appropriate.

Signed-off-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Cc: Sergei Antonov <saproj@gmail.com>
Cc: Joe Perches <joe@perches.com>
Reviewed-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Anton Altaparmakov <anton@tuxera.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agohfs,hfsplus: cache pages correctly between bnode_create and bnode_free
Hin-Tak Leung [Wed, 9 Sep 2015 22:38:04 +0000 (15:38 -0700)]
hfs,hfsplus: cache pages correctly between bnode_create and bnode_free

Pages looked up by __hfs_bnode_create() (called by hfs_bnode_create() and
hfs_bnode_find() for finding or creating pages corresponding to an inode)
are immediately kmap()'ed and used (both read and write) and kunmap()'ed,
and should not be page_cache_release()'ed until hfs_bnode_free().

This patch fixes a problem I first saw in July 2012: merely running "du"
on a large hfsplus-mounted directory a few times on a reasonably loaded
system would get the hfsplus driver all confused and complaining about
B-tree inconsistencies, and generates a "BUG: Bad page state".  Most
recently, I can generate this problem on up-to-date Fedora 22 with shipped
kernel 4.0.5, by running "du /" (="/" + "/home" + "/mnt" + other smaller
mounts) and "du /mnt" simultaneously on two windows, where /mnt is a
lightly-used QEMU VM image of the full Mac OS X 10.9:

$ df -i / /home /mnt
Filesystem                  Inodes   IUsed      IFree IUse% Mounted on
/dev/mapper/fedora-root    3276800  551665    2725135   17% /
/dev/mapper/fedora-home   52879360  716221   52163139    2% /home
/dev/nbd0p2             4294967295 1387818 4293579477    1% /mnt

After applying the patch, I was able to run "du /" (60+ times) and "du
/mnt" (150+ times) continuously and simultaneously for 6+ hours.

There are many reports of the hfsplus driver getting confused under load
and generating "BUG: Bad page state" or other similar issues over the
years.  [1]

The unpatched code [2] has always been wrong since it entered the kernel
tree.  The only reason why it gets away with it is that the
kmap/memcpy/kunmap follow very quickly after the page_cache_release() so
the kernel has not had a chance to reuse the memory for something else,
most of the time.

The current RW driver appears to have followed the design and development
of the earlier read-only hfsplus driver [3], where-by version 0.1 (Dec
2001) had a B-tree node-centric approach to
read_cache_page()/page_cache_release() per bnode_get()/bnode_put(),
migrating towards version 0.2 (June 2002) of caching and releasing pages
per inode extents.  When the current RW code first entered the kernel [2]
in 2005, there was an REF_PAGES conditional (and "//" commented out code)
to switch between B-node centric paging to inode-centric paging.  There
was a mistake with the direction of one of the REF_PAGES conditionals in
__hfs_bnode_create().  In a subsequent "remove debug code" commit [4], the
read_cache_page()/page_cache_release() per bnode_get()/bnode_put() were
removed, but a page_cache_release() was mistakenly left in (propagating
the "REF_PAGES <-> !REF_PAGE" mistake), and the commented-out
page_cache_release() in bnode_release() (which should be spanned by
!REF_PAGES) was never enabled.

References:
[1]:
Michael Fox, Apr 2013
http://www.spinics.net/lists/linux-fsdevel/msg63807.html
("hfsplus volume suddenly inaccessable after 'hfs: recoff %d too large'")

Sasha Levin, Feb 2015
http://lkml.org/lkml/2015/2/20/85 ("use after free")

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/740814
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1027887
https://bugzilla.kernel.org/show_bug.cgi?id=42342
https://bugzilla.kernel.org/show_bug.cgi?id=63841
https://bugzilla.kernel.org/show_bug.cgi?id=78761

[2]:
http://git.kernel.org/cgit/linux/kernel/git/tglx/history.git/commit/\
fs/hfs/bnode.c?id=d1081202f1d0ee35ab0beb490da4b65d4bc763db
commit d1081202f1d0ee35ab0beb490da4b65d4bc763db
Author: Andrew Morton <akpm@osdl.org>
Date:   Wed Feb 25 16:17:36 2004 -0800

    [PATCH] HFS rewrite

http://git.kernel.org/cgit/linux/kernel/git/tglx/history.git/commit/\
fs/hfsplus/bnode.c?id=91556682e0bf004d98a529bf829d339abb98bbbd

commit 91556682e0bf004d98a529bf829d339abb98bbbd
Author: Andrew Morton <akpm@osdl.org>
Date:   Wed Feb 25 16:17:48 2004 -0800

    [PATCH] HFS+ support

[3]:
http://sourceforge.net/projects/linux-hfsplus/

http://sourceforge.net/projects/linux-hfsplus/files/Linux%202.4.x%20patch/hfsplus%200.1/
http://sourceforge.net/projects/linux-hfsplus/files/Linux%202.4.x%20patch/hfsplus%200.2/

http://linux-hfsplus.cvs.sourceforge.net/viewvc/linux-hfsplus/linux/\
fs/hfsplus/bnode.c?r1=1.4&r2=1.5

Date:   Thu Jun 6 09:45:14 2002 +0000
Use buffer cache instead of page cache in bnode.c. Cache inode extents.

[4]:
http://git.kernel.org/cgit/linux/kernel/git/\
stable/linux-stable.git/commit/?id=a5e3985fa014029eb6795664c704953720cc7f7d

commit a5e3985fa014029eb6795664c704953720cc7f7d
Author: Roman Zippel <zippel@linux-m68k.org>
Date:   Tue Sep 6 15:18:47 2005 -0700

[PATCH] hfs: remove debug code

Signed-off-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Signed-off-by: Sergei Antonov <saproj@gmail.com>
Reviewed-by: Anton Altaparmakov <anton@tuxera.com>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Sougata Santra <sougata@tuxera.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agofs/coda: fix readlink buffer overflow
Jan Harkes [Wed, 9 Sep 2015 22:38:01 +0000 (15:38 -0700)]
fs/coda: fix readlink buffer overflow

Dan Carpenter discovered a buffer overflow in the Coda file system
readlink code.  A userspace file system daemon can return a 4096 byte
result which then triggers a one byte write past the allocated readlink
result buffer.

This does not trigger with an unmodified Coda implementation because Coda
has a 1024 byte limit for symbolic links, however other userspace file
systems using the Coda kernel module could be affected.

Although this is an obvious overflow, I don't think this has to be handled
as too sensitive from a security perspective because the overflow is on
the Coda userspace daemon side which already needs root to open Coda's
kernel device and to mount the file system before we get to the point that
links can be read.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: add constant comparison on left side test
Joe Perches [Wed, 9 Sep 2015 22:37:58 +0000 (15:37 -0700)]
checkpatch: add constant comparison on left side test

"CONST <comparison> variable" checks like:

        if (NULL != foo)
and
        while (0 < bar(...))

where a constant (or what appears to be a constant like an upper case
identifier) is on the left of a comparison are generally preferred to be
written using the constant on the right side like:

        if (foo != NULL)
and
        while (bar(...) > 0)

Add a test for this.

Add a --fix option too, but only do it when the code is immediately
surrounded by parentheses to avoid misfixing things like "(0 < bar() +
constant)"

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Nicolas Morey Chaisemartin <nmorey@kalray.eu>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: add __pmem to $Sparse annotations
Joe Perches [Wed, 9 Sep 2015 22:37:55 +0000 (15:37 -0700)]
checkpatch: add __pmem to $Sparse annotations

commit 61031952f4c8 ("arch, x86: pmem api for ensuring durability of
persistent memory updates") added a new __pmem annotation for sparse
verification.  Add __pmem to the $Sparse variable so checkpatch can
appropriately ignore uses of this attribute too.

Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: fix left brace warning
Eddie Kovsky [Wed, 9 Sep 2015 22:37:52 +0000 (15:37 -0700)]
checkpatch: fix left brace warning

Using checkpatch.pl with Perl 5.22.0 generates the following warning:

    Unescaped left brace in regex is deprecated, passed through in regex;

This patch fixes the warnings by escaping occurrences of the left brace
inside the regular expression.

Signed-off-by: Eddie Kovsky <ewk@edkovsky.org>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: avoid some commit message long line warnings
Joe Perches [Wed, 9 Sep 2015 22:37:50 +0000 (15:37 -0700)]
checkpatch: avoid some commit message long line warnings

Fixes: and Link: lines may exceed 75 chars in the commit log.
So too can stack dump and dmesg lines and lines that seem
like filenames.

And Fixes: lines don't need to have a "commit" prefix before the
commit id.

Add exceptions for these types of lines.

Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: emit an error on formats with 0x%<decimal>
Joe Perches [Wed, 9 Sep 2015 22:37:47 +0000 (15:37 -0700)]
checkpatch: emit an error on formats with 0x%<decimal>

Using 0x%d is wrong.  Emit a message when it happens.

Miscellanea:

Improve the %Lu warning to match formats like %16Lu.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: make --strict the default for drivers/staging files and patches
Joe Perches [Wed, 9 Sep 2015 22:37:44 +0000 (15:37 -0700)]
checkpatch: make --strict the default for drivers/staging files and patches

Making --strict the default for staging may help some people submit
patches without obvious defects.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: always check block comment styles
Joe Perches [Wed, 9 Sep 2015 22:37:41 +0000 (15:37 -0700)]
checkpatch: always check block comment styles

Some of the block comment tests that are used only for networking are
appropriate for all patches.

For example, these styles are not encouraged:

/*
 block comment without introductory *
*/
and
/*
 * block comment with line terminating */

Remove the networking specific test and add comments.

There are some infrequent false positives where code is lazily
commented out using /* and */ rather than using #if 0/#endif blocks
like:
/* case foo:
case bar: */
case baz:

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: report the right line # when using --emacs and --file
Joe Perches [Wed, 9 Sep 2015 22:37:39 +0000 (15:37 -0700)]
checkpatch: report the right line # when using --emacs and --file

commit 34d8815f9512 ("checkpatch: add --showfile to allow input via pipe
to show filenames") broke the --emacs with --file option.

Fix it.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
9 years agocheckpatch: add some <foo>_destroy functions to NEEDLESS_IF tests
Joe Perches [Wed, 9 Sep 2015 22:37:36 +0000 (15:37 -0700)]
checkpatch: add some <foo>_destroy functions to NEEDLESS_IF tests

Sergey Senozhatsky has modified several destroy functions that can
now be called with NULL values.

 - kmem_cache_destroy()
 - mempool_destroy()
 - dma_pool_destroy()

Update checkpatch to warn when those functions are preceded by an if.

Update checkpatch to --fix all the calls too only when the code style
form is using leading tabs.

from:
if (foo)
<func>(foo);
to:
<func>(foo);

Signed-off-by: Joe Perches <joe@perches.com>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>