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b388f15fd1
This was found when using pwm-led on am33xx and enable heartbeat trigger. [ 808.624876] ================================= [ 808.629443] [ INFO: inconsistent lock state ] [ 808.634021] 3.9.0 #2 Not tainted [ 808.637415] --------------------------------- [ 808.641981] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 808.648288] swapper/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 808.653494] (prepare_lock){+.?.+.}, at: [<c027c211>] clk_unprepare+0x15/0x24 [ 808.661040] {SOFTIRQ-ON-W} state was registered at: [ 808.666155] [<c004ec4d>] __lock_acquire+0x411/0x824 [ 808.671465] [<c004f359>] lock_acquire+0x41/0x50 [ 808.676412] [<c039ee9d>] mutex_lock_nested+0x31/0x1d8 [ 808.681912] [<c027c275>] clk_prepare+0x15/0x28 [ 808.686764] [<c0590c6b>] _init+0x117/0x1e0 [ 808.691256] [<c0019ef9>] omap_hwmod_for_each+0x29/0x3c [ 808.696842] [<c0591107>] __omap_hwmod_setup_all+0x17/0x2c [ 808.702696] [<c0008653>] do_one_initcall+0xc3/0x10c [ 808.708017] [<c058a627>] kernel_init_freeable+0xa7/0x134 [ 808.713778] [<c039a543>] kernel_init+0x7/0x98 [ 808.718544] [<c000cd95>] ret_from_fork+0x11/0x3c [ 808.723583] irq event stamp: 1379172 [ 808.727328] hardirqs last enabled at (1379172): [<c03a0759>] _raw_spin_unlock_irqrestore+0x21/0x30 [ 808.736828] hardirqs last disabled at (1379171): [<c03a03c3>] _raw_spin_lock_irqsave+0x13/0x38 [ 808.745876] softirqs last enabled at (1379164): [<c002ae5d>] irq_enter+0x49/0x4c [ 808.753747] softirqs last disabled at (1379165): [<c002aec3>] irq_exit+0x63/0x88 [ 808.761518] [ 808.761518] other info that might help us debug this: [ 808.768373] Possible unsafe locking scenario: [ 808.768373] [ 808.774578] CPU0 [ 808.777141] ---- [ 808.779705] lock(prepare_lock); [ 808.783186] <Interrupt> [ 808.785929] lock(prepare_lock); [ 808.789595] [ 808.789595] *** DEADLOCK *** [ 808.789595] [ 808.795805] 1 lock held by swapper/0: [ 808.799643] #0: (((&heartbeat_data->timer))){+.-...}, at: [<c002e204>] call_timer_fn+0x0/0x90 [ 808.808814] [ 808.808814] stack backtrace: [ 808.813402] [<c000ff19>] (unwind_backtrace+0x1/0x98) from [<c039bd75>] (print_usage_bug.part.25+0x16d/0x1cc) [ 808.823721] [<c039bd75>] (print_usage_bug.part.25+0x16d/0x1cc) from [<c004e595>] (mark_lock+0x18d/0x434) [ 808.833669] [<c004e595>] (mark_lock+0x18d/0x434) from [<c004ec1d>] (__lock_acquire+0x3e1/0x824) [ 808.842803] [<c004ec1d>] (__lock_acquire+0x3e1/0x824) from [<c004f359>] (lock_acquire+0x41/0x50) [ 808.852031] [<c004f359>] (lock_acquire+0x41/0x50) from [<c039ee9d>] (mutex_lock_nested+0x31/0x1d8) [ 808.861433] [<c039ee9d>] (mutex_lock_nested+0x31/0x1d8) from [<c027c211>] (clk_unprepare+0x15/0x24) [ 808.870930] [<c027c211>] (clk_unprepare+0x15/0x24) from [<c019f7bf>] (ehrpwm_pwm_disable+0x5f/0x80) [ 808.880431] [<c019f7bf>] (ehrpwm_pwm_disable+0x5f/0x80) from [<c019f29f>] (pwm_disable+0x27/0x28) [ 808.889751] [<c019f29f>] (pwm_disable+0x27/0x28) from [<c026f8f3>] (led_heartbeat_function+0x3f/0xb0) [ 808.899431] [<c026f8f3>] (led_heartbeat_function+0x3f/0xb0) from [<c002e249>] (call_timer_fn+0x45/0x90) [ 808.909288] [<c002e249>] (call_timer_fn+0x45/0x90) from [<c002e399>] (run_timer_softirq+0x105/0x17c) [ 808.918884] [<c002e399>] (run_timer_softirq+0x105/0x17c) from [<c002abc5>] (__do_softirq+0xa5/0x150) [ 808.928486] [<c002abc5>] (__do_softirq+0xa5/0x150) from [<c002aec3>] (irq_exit+0x63/0x88) [ 808.937098] [<c002aec3>] (irq_exit+0x63/0x88) from [<c000d599>] (handle_IRQ+0x21/0x54) [ 808.945415] [<c000d599>] (handle_IRQ+0x21/0x54) from [<c0008495>] (omap3_intc_handle_irq+0x5d/0x68) [ 808.954900] [<c0008495>] (omap3_intc_handle_irq+0x5d/0x68) from [<c000c7ff>] (__irq_svc+0x3f/0x64) [ 808.964287] Exception stack(0xc05b1f68 to 0xc05b1fb0) [ 808.969587] 1f60: 00000001 00000001 00000000 00000000 c05b0000 c0619748 [ 808.978158] 1f80: c05b0000 c05b0000 c0619748 413fc082 00000000 00000000 01000000 c05b1fb0 [ 808.986719] 1fa0: c004f989 c000d6f0 400f0033 ffffffff [ 808.992024] [<c000c7ff>] (__irq_svc+0x3f/0x64) from [<c000d6f0>] (cpu_idle+0x60/0x98) [ 809.000250] [<c000d6f0>] (cpu_idle+0x60/0x98) from [<c058a535>] (start_kernel+0x1e9/0x234) Remove non atomic clk api calls and use only atomic for enable/disable because can be called from atomic context (led_heartbeat_function is timer callback). Signed-off-by: Marek Belisko <marek.belisko@streamunlimited.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com> |
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|---|---|---|
| .. | ||
| core.c | ||
| Kconfig | ||
| Makefile | ||
| pwm-ab8500.c | ||
| pwm-atmel-tcb.c | ||
| pwm-bfin.c | ||
| pwm-imx.c | ||
| pwm-jz4740.c | ||
| pwm-lpc32xx.c | ||
| pwm-mxs.c | ||
| pwm-pca9685.c | ||
| pwm-puv3.c | ||
| pwm-pxa.c | ||
| pwm-renesas-tpu.c | ||
| pwm-samsung.c | ||
| pwm-spear.c | ||
| pwm-tegra.c | ||
| pwm-tiecap.c | ||
| pwm-tiehrpwm.c | ||
| pwm-tipwmss.c | ||
| pwm-tipwmss.h | ||
| pwm-twl-led.c | ||
| pwm-twl.c | ||
| pwm-vt8500.c | ||
| sysfs.c | ||