[PATCH 4.9 058/118] clocksource/drivers/exynos_mct: Clear timer interrupt when shutdown

From: Greg Kroah-Hartman
Date: Fri Mar 22 2019 - 07:42:33 EST

4.9-stable review patch. If anyone has any objections, please let me know.


From: Stuart Menefy <stuart.menefy@xxxxxxxxxxxxxxxx>

commit d2f276c8d3c224d5b493c42b6cf006ae4e64fb1c upstream.

When shutting down the timer, ensure that after we have stopped the
timer any pending interrupts are cleared. This fixes a problem when
suspending, as interrupts are disabled before the timer is stopped,
so the timer interrupt may still be asserted, preventing the system
entering a low power state when the wfi is executed.

Signed-off-by: Stuart Menefy <stuart.menefy@xxxxxxxxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.3+
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/clocksource/exynos_mct.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -411,6 +411,7 @@ static int set_state_shutdown(struct clo

mevt = container_of(evt, struct mct_clock_event_device, evt);
+ exynos4_mct_tick_clear(mevt);
return 0;