From: Joonyoung Shim <[email protected]>
[ Upstream commit bc7c36eedb0c7004aa06c2afc3c5385adada8fa3 ]
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 <[email protected]>
Signed-off-by: Joonyoung Shim <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
drivers/clocksource/exynos_mct.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index c844616028d2..714f9a767b17 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -487,6 +487,7 @@ static void exynos4_local_timer_stop(struct
clock_event_device *evt)
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]);
}
--
2.17.1
