From 35a67edf3570e9b44c34965dd52a6b7f845fb40f Mon Sep 17 00:00:00 2001 From: Enric Balletbo i Serra Date: Tue, 5 Apr 2011 06:52:49 +0000 Subject: [PATCH] smsc911x: fix mac_lock acquision before calling smsc911x_mac_read When SMSC911X_SAVE_MAC_ADDRESS flag is enabled the driver calls smsc911x_mac_read and smsc911x_mac_read function without acquiring mac_lock spinlock This patch fixes following warning smsc911x: Driver version 2008-10-21. ------------[ cut here ]------------ WARNING: at drivers/net/smsc911x.c:261 smsc911x_mac_read+0x24/0x220() Modules linked in: [] (unwind_backtrace+0x0/0xe0) from [] (warn_slowpath_common+0x4c/0x64) [] (warn_slowpath_common+0x4c/0x64) from [] (warn_slowpath_null+0x18/0x1c) [] (warn_slowpath_null+0x18/0x1c) from [] (smsc911x_mac_read+0x24/0x220) [] (smsc911x_mac_read+0x24/0x220) from [] (smsc911x_read_mac_address+0x18/0x6c) [] (smsc911x_read_mac_address+0x18/0x6c) from [] (smsc911x_drv_probe+0x498/0x1788) [] (smsc911x_drv_probe+0x498/0x1788) from [] (platform_drv_probe+0x14/0x18) [] (platform_drv_probe+0x14/0x18) from [] (driver_probe_device+0xc8/0x184) [] (driver_probe_device+0xc8/0x184) from [] (__driver_attach+0x68/0x8c) [] (__driver_attach+0x68/0x8c) from [] (bus_for_each_dev+0x48/0x74) [] (bus_for_each_dev+0x48/0x74) from [] (bus_add_driver+0x9c/0x228) [] (bus_add_driver+0x9c/0x228) from [] (driver_register+0xa0/0x124) [] (driver_register+0xa0/0x124) from [] (do_one_initcall+0x94/0x168) [] (do_one_initcall+0x94/0x168) from [] (kernel_init+0xa0/0x154) [] (kernel_init+0xa0/0x154) from [] (kernel_thread_exit+0x0/0x8) ---[ end trace 2c931a35b7885770 ]--- Signed-off-by: Enric Balletbo i Serra Signed-off-by: David S. Miller --- drivers/net/smsc911x.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c index 1566259c1f27..4747846eb4f2 100644 --- a/drivers/net/smsc911x.c +++ b/drivers/net/smsc911x.c @@ -1818,6 +1818,7 @@ static int __devinit smsc911x_init(struct net_device *dev) SMSC_TRACE(PROBE, "PHY will be autodetected."); spin_lock_init(&pdata->dev_lock); + spin_lock_init(&pdata->mac_lock); if (pdata->ioaddr == 0) { SMSC_WARNING(PROBE, "pdata->ioaddr: 0x00000000"); @@ -1895,8 +1896,11 @@ static int __devinit smsc911x_init(struct net_device *dev) /* workaround for platforms without an eeprom, where the mac address * is stored elsewhere and set by the bootloader. This saves the * mac address before resetting the device */ - if (pdata->config.flags & SMSC911X_SAVE_MAC_ADDRESS) + if (pdata->config.flags & SMSC911X_SAVE_MAC_ADDRESS) { + spin_lock_irq(&pdata->mac_lock); smsc911x_read_mac_address(dev); + spin_unlock_irq(&pdata->mac_lock); + } /* Reset the LAN911x */ if (smsc911x_soft_reset(pdata)) @@ -2059,8 +2063,6 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev) SMSC_TRACE(PROBE, "Network interface: \"%s\"", dev->name); } - spin_lock_init(&pdata->mac_lock); - retval = smsc911x_mii_init(pdev, dev); if (retval) { SMSC_WARNING(PROBE, -- 2.30.2