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a585f87c86
The scenario here is that someone calls enable_irq_wake() from somewhere in the code. This will result in the lockdep producing a backtrace as can be seen below. In my case, this problem is triggered when using the wl1271 (TI WlCore) driver found in drivers/net/wireless/ti/ . The problem cause is rather obvious from the backtrace, but let's outline the dependency. enable_irq_wake() grabs the IRQ buslock in irq_set_irq_wake(), which in turns calls mxs_gpio_set_wake_irq() . But mxs_gpio_set_wake_irq() calls enable_irq_wake() again on the one-level-higher IRQ , thus it tries to grab the IRQ buslock again in irq_set_irq_wake() . Because the spinlock in irq_set_irq_wake()->irq_get_desc_buslock()->__irq_get_desc_lock() is not marked as recursive, lockdep will spew the stuff below. We know we can safely re-enter the lock, so use IRQ_GC_INIT_NESTED_LOCK to fix the spew. ============================================= [ INFO: possible recursive locking detected ] 3.10.33-00012-gf06b763-dirty #61 Not tainted --------------------------------------------- kworker/0:1/18 is trying to acquire lock: (&irq_desc_lock_class){-.-...}, at: [<c00685f0>] __irq_get_desc_lock+0x48/0x88 but task is already holding lock: (&irq_desc_lock_class){-.-...}, at: [<c00685f0>] __irq_get_desc_lock+0x48/0x88 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&irq_desc_lock_class); lock(&irq_desc_lock_class); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by kworker/0:1/18: #0: (events){.+.+.+}, at: [<c0036308>] process_one_work+0x134/0x4a4 #1: ((&fw_work->work)){+.+.+.}, at: [<c0036308>] process_one_work+0x134/0x4a4 #2: (&irq_desc_lock_class){-.-...}, at: [<c00685f0>] __irq_get_desc_lock+0x48/0x88 stack backtrace: CPU: 0 PID: 18 Comm: kworker/0:1 Not tainted 3.10.33-00012-gf06b763-dirty #61 Workqueue: events request_firmware_work_func [<c0013eb4>] (unwind_backtrace+0x0/0xf0) from [<c0011c74>] (show_stack+0x10/0x14) [<c0011c74>] (show_stack+0x10/0x14) from [<c005bb08>] (__lock_acquire+0x140c/0x1a64) [<c005bb08>] (__lock_acquire+0x140c/0x1a64) from [<c005c6a8>] (lock_acquire+0x9c/0x104) [<c005c6a8>] (lock_acquire+0x9c/0x104) from [<c051d5a4>] (_raw_spin_lock_irqsave+0x44/0x58) [<c051d5a4>] (_raw_spin_lock_irqsave+0x44/0x58) from [<c00685f0>] (__irq_get_desc_lock+0x48/0x88) [<c00685f0>] (__irq_get_desc_lock+0x48/0x88) from [<c0068e78>] (irq_set_irq_wake+0x20/0xf4) [<c0068e78>] (irq_set_irq_wake+0x20/0xf4) from [<c027260c>] (mxs_gpio_set_wake_irq+0x1c/0x24) [<c027260c>] (mxs_gpio_set_wake_irq+0x1c/0x24) from [<c0068cf4>] (set_irq_wake_real+0x30/0x44) [<c0068cf4>] (set_irq_wake_real+0x30/0x44) from [<c0068ee4>] (irq_set_irq_wake+0x8c/0xf4) [<c0068ee4>] (irq_set_irq_wake+0x8c/0xf4) from [<c0310748>] (wlcore_nvs_cb+0x10c/0x97c) [<c0310748>] (wlcore_nvs_cb+0x10c/0x97c) from [<c02be5e8>] (request_firmware_work_func+0x38/0x58) [<c02be5e8>] (request_firmware_work_func+0x38/0x58) from [<c0036394>] (process_one_work+0x1c0/0x4a4) [<c0036394>] (process_one_work+0x1c0/0x4a4) from [<c0036a4c>] (worker_thread+0x138/0x394) [<c0036a4c>] (worker_thread+0x138/0x394) from [<c003cb74>] (kthread+0xa4/0xb0) [<c003cb74>] (kthread+0xa4/0xb0) from [<c000ee00>] (ret_from_fork+0x14/0x34) wlcore: loaded Cc: stable@vger.kernel.org Signed-off-by: Marek Vasut <marex@denx.de> Acked-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
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| .. | ||
| devres.c | ||
| gpio-74x164.c | ||
| gpio-adnp.c | ||
| gpio-adp5520.c | ||
| gpio-adp5588.c | ||
| gpio-amd8111.c | ||
| gpio-arizona.c | ||
| gpio-bcm-kona.c | ||
| gpio-bt8xx.c | ||
| gpio-clps711x.c | ||
| gpio-cs5535.c | ||
| gpio-da9052.c | ||
| gpio-da9055.c | ||
| gpio-davinci.c | ||
| gpio-dwapb.c | ||
| gpio-em.c | ||
| gpio-ep93xx.c | ||
| gpio-f7188x.c | ||
| gpio-ge.c | ||
| gpio-generic.c | ||
| gpio-grgpio.c | ||
| gpio-ich.c | ||
| gpio-intel-mid.c | ||
| gpio-iop.c | ||
| gpio-it8761e.c | ||
| gpio-janz-ttl.c | ||
| gpio-kempld.c | ||
| gpio-ks8695.c | ||
| gpio-lp3943.c | ||
| gpio-lpc32xx.c | ||
| gpio-lynxpoint.c | ||
| gpio-max730x.c | ||
| gpio-max732x.c | ||
| gpio-max7300.c | ||
| gpio-max7301.c | ||
| gpio-mc9s08dz60.c | ||
| gpio-mc33880.c | ||
| gpio-mcp23s08.c | ||
| gpio-ml-ioh.c | ||
| gpio-mm-lantiq.c | ||
| gpio-moxart.c | ||
| gpio-mpc8xxx.c | ||
| gpio-mpc5200.c | ||
| gpio-msic.c | ||
| gpio-msm-v1.c | ||
| gpio-msm-v2.c | ||
| gpio-mvebu.c | ||
| gpio-mxc.c | ||
| gpio-mxs.c | ||
| gpio-octeon.c | ||
| gpio-omap.c | ||
| gpio-palmas.c | ||
| gpio-pca953x.c | ||
| gpio-pcf857x.c | ||
| gpio-pch.c | ||
| gpio-pl061.c | ||
| gpio-pxa.c | ||
| gpio-rc5t583.c | ||
| gpio-rcar.c | ||
| gpio-rdc321x.c | ||
| gpio-sa1100.c | ||
| gpio-samsung.c | ||
| gpio-sch311x.c | ||
| gpio-sch.c | ||
| gpio-sodaville.c | ||
| gpio-spear-spics.c | ||
| gpio-sta2x11.c | ||
| gpio-stmpe.c | ||
| gpio-stp-xway.c | ||
| gpio-sx150x.c | ||
| gpio-syscon.c | ||
| gpio-tb10x.c | ||
| gpio-tc3589x.c | ||
| gpio-tegra.c | ||
| gpio-timberdale.c | ||
| gpio-tps6586x.c | ||
| gpio-tps65910.c | ||
| gpio-tps65912.c | ||
| gpio-ts5500.c | ||
| gpio-twl4030.c | ||
| gpio-twl6040.c | ||
| gpio-tz1090-pdc.c | ||
| gpio-tz1090.c | ||
| gpio-ucb1400.c | ||
| gpio-viperboard.c | ||
| gpio-vr41xx.c | ||
| gpio-vx855.c | ||
| gpio-wm831x.c | ||
| gpio-wm8350.c | ||
| gpio-wm8994.c | ||
| gpio-xilinx.c | ||
| gpio-xtensa.c | ||
| gpio-zevio.c | ||
| gpiolib-acpi.c | ||
| gpiolib-of.c | ||
| gpiolib.c | ||
| gpiolib.h | ||
| Kconfig | ||
| Makefile | ||