[PATCH 4.9 061/130] clocksource/exynos_mct: Clear interrupt when cpu is shut down
Greg Kroah-Hartman
gregkh at linuxfoundation.org
Mon Jan 23 23:55:01 PST 2017
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Joonyoung Shim <jy0922.shim at samsung.com>
commit bc7c36eedb0c7004aa06c2afc3c5385adada8fa3 upstream.
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: 56a94f13919c ("clocksource: exynos_mct: Avoid blocking calls in the cpu hotplug notifier")
Reported-by: Seung-Woo Kim <sw0312.kim at samsung.com>
Signed-off-by: Joonyoung Shim <jy0922.shim at samsung.com>
Cc: linux-samsung-soc at vger.kernel.org
Cc: cw00.choi at samsung.com
Cc: daniel.lezcano at linaro.org
Cc: javier at osg.samsung.com
Cc: kgene at kernel.org
Cc: krzk at kernel.org
Cc: linux-arm-kernel at 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 at linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
drivers/clocksource/exynos_mct.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -495,6 +495,7 @@ static int exynos4_mct_dying_cpu(unsigne
if (mct_int_type == MCT_INT_SPI) {
if (evt->irq != -1)
disable_irq_nosync(evt->irq);
+ exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
} else {
disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);
}
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