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

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Message-Id: <20190322111220.598399854@linuxfoundation.org>
Date:   Fri, 22 Mar 2019 12:15:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Stuart Menefy <stuart.menefy@...hembedded.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: [PATCH 4.9 058/118] clocksource/drivers/exynos_mct: Clear timer interrupt when shutdown

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

------------------

From: Stuart Menefy <stuart.menefy@...hembedded.com>

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@...hembedded.com>
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: <stable@...r.kernel.org> # v4.3+
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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_stop(mevt);
+	exynos4_mct_tick_clear(mevt);
 	return 0;
 }