[PATCH] clockevents/drivers/cs5535: Un-break driver with 'set-state' interface

[David Gstir <david@sigma-star.at>]

Since migrating to the 'set-state' interface the cs5535 driver causes a
crash after loading: Right after initialization, the IRQ handler
(mfgpt_tick) is triggered with clock event device in detached state. This
state not properly handled and causes a crash through NULL pointer
dereference upon calling the clockevent's event_handler.

This patch fixes this by handling the detached state the same way the
shutdown state is handled.

Fixes: 8f9327cbb6e8 ("clockevents/drivers/cs5535: Migrate to new 'set-state' interface")
Cc: stable@vger.kernel.org
Cc: Andres Salomon <dilinger@queued.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: David Gstir <david@sigma-star.at>
---
 drivers/clocksource/cs5535-clockevt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/cs5535-clockevt.c b/drivers/clocksource/cs5535-clockevt.c
index 9a7e37cf56b0..649e0cd90805 100644
--- a/drivers/clocksource/cs5535-clockevt.c
+++ b/drivers/clocksource/cs5535-clockevt.c
@@ -117,7 +117,8 @@ static irqreturn_t mfgpt_tick(int irq, void *dev_id)
 	/* Turn off the clock (and clear the event) */
 	disable_timer(cs5535_event_clock);
 
-	if (clockevent_state_shutdown(&cs5535_clockevent))
+	if (clockevent_state_shutdown(&cs5535_clockevent) ||
+			clockevent_state_detached(&cs5535_clockevent))
 		return IRQ_HANDLED;
 
 	/* Clear the counter */
-- 
2.11.0