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authorViresh Kumar <viresh.kumar@linaro.org>2015-04-10 12:56:41 +0530
committerThomas Gleixner <tglx@linutronix.de>2015-04-24 21:01:48 +0200
commit149aabcc44e3e2c1f8fe4f0832be53d2db55b598 (patch)
treee895aa0d171944c4c9a7cc499e5f1e271180fecd /kernel
parent646da63172f660ba84f195c1165360a9b73583ee (diff)
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clockevents: Shutdown detached clockevent device
A clockevent device is marked DETACHED when it is replaced by another clockevent device. The device is shutdown properly for drivers that implement legacy ->set_mode() callback, as we call ->set_mode() for CLOCK_EVT_MODE_UNUSED as well. But for the new per-state callback interface, we skip shutting down the device, as we thought its an internal state change. That wasn't correct. The effect is that the device is left programmed in oneshot or periodic mode. Fall-back to 'case CLOCK_EVT_STATE_SHUTDOWN', to shutdown the device. Fixes: bd624d75db21 "clockevents: Introduce mode specific callbacks" Reported-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: linaro-kernel@lists.linaro.org Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/eef0a91c51b74d4e52c8e5a95eca27b5a0563f07.1428650683.git.viresh.kumar@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/clockevents.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 25d942d1da27..629be4e21e96 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -117,11 +117,7 @@ static int __clockevents_set_state(struct clock_event_device *dev,
/* Transition with new state-specific callbacks */
switch (state) {
case CLOCK_EVT_STATE_DETACHED:
- /*
- * This is an internal state, which is guaranteed to go from
- * SHUTDOWN to DETACHED. No driver interaction required.
- */
- return 0;
+ /* The clockevent device is getting replaced. Shut it down. */
case CLOCK_EVT_STATE_SHUTDOWN:
return dev->set_state_shutdown(dev);