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clocksource/exynos_mct: Clear interrupt when cpu is shut down 

When a CPU goes offline a potentially pending timer interrupt is not
cleared. When the CPU comes online again then the pending interrupt is
delivered before the per cpu clockevent device is initialized. As a
consequence the tick interrupt handler dereferences a NULL pointer.

[   51.251378] Unable to handle kernel NULL pointer dereference at virtual address 00000040
[   51.289348] task: ee942d00 task.stack: ee960000
[   51.293861] PC is at tick_periodic+0x38/0xb0
[   51.298102] LR is at tick_handle_periodic+0x1c/0x90

Clear the pending interrupt in the cpu dying path.

Fixes: 56a94f1391 ("clocksource: exynos_mct: Avoid blocking calls in the cpu hotplug notifier")
Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Cc: linux-samsung-soc@vger.kernel.org
Cc: cw00.choi@samsung.com
Cc: daniel.lezcano@linaro.org
Cc: stable@vger.kernel.org
Cc: javier@osg.samsung.com
Cc: kgene@kernel.org
Cc: krzk@kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1484628876-22065-1-git-send-email-jy0922.shim@samsung.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Joonyoung Shim 2017-01-17 13:54:36 +09:00 committed by Thomas Gleixner
parent 49def18533
commit bc7c36eedb
1 changed files with 1 additions and 0 deletions
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drivers/clocksource/exynos_mct.c
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@ -495,6 +495,7 @@ static int exynos4_mct_dying_cpu(unsigned int cpu)
if (mct_int_type == MCT_INT_SPI) { if (mct_int_type == MCT_INT_SPI) {
if (evt->irq != -1) if (evt->irq != -1)
disable_irq_nosync(evt->irq); disable_irq_nosync(evt->irq);
exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
} else { } else {
disable_percpu_irq(mct_irqs[MCT_L0_IRQ]); disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);
} }