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 ---
Tested on Samsung's Arndale (Dual Cortex A15) board.
kernel/time/clockevents.c | 6 +----- 1 file changed, 1 insertion(+), 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);