4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Joonyoung Shim <jy0922.s...@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....@samsung.com>
Signed-off-by: Joonyoung Shim <jy0922.s...@samsung.com>
Cc: linux-samsung-...@vger.kernel.org
Cc: cw00.c...@samsung.com
Cc: daniel.lezc...@linaro.org
Cc: jav...@osg.samsung.com
Cc: kg...@kernel.org
Cc: k...@kernel.org
Cc: linux-arm-ker...@lists.infradead.org
Link:
http://lkml.kernel.org/r/1484628876-22065-1-git-send-email-jy0922.s...@samsung.com
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gre...@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
@@ -482,6 +482,7 @@ static void exynos4_local_timer_stop(str
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]);
}
