PCI: Don't try to disable Bus Master on disconnected PCI devices

This is a fix for commit 7897e60227 ("PCI: Disable Bus Master
unconditionally in pci_device_shutdown()").  Vivek reported that
with this commit, kexec failed because none of his SATA disks
came up.

A ->shutdown() callback might put the device in D3cold, which means config
space is no longer available.

[bhelgaas: changelog]
Link: https://lkml.org/lkml/2013/3/12/529
Reported-and-Tested-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 1fa1e482a99976d36d8e91b2affee58af3bda693..79277fb36c6bf7a85b4634df28ff13d1905d703d 100644 (file)
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -390,9 +390,10 @@ static void pci_device_shutdown(struct device *dev)
 
        /*
         * Turn off Bus Master bit on the device to tell it to not
-        * continue to do DMA
+        * continue to do DMA. Don't touch devices in D3cold or unknown states.
         */
-       pci_clear_master(pci_dev);
+       if (pci_dev->current_state <= PCI_D3hot)
+               pci_clear_master(pci_dev);
 }
 
 #ifdef CONFIG_PM