From: David Kozub Date: Thu, 19 Oct 2017 20:57:02 +0000 (+0200) Subject: clockevents/drivers/cs5535: Improve resilience to spurious interrupts X-Git-Tag: v4.14-rc6~6^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=eb39a7c0355393c5a8d930f342ad7a6231b552c4;p=platform%2Fkernel%2Flinux-rpi.git clockevents/drivers/cs5535: Improve resilience to spurious interrupts The interrupt handler mfgpt_tick() is not robust versus spurious interrupts which happen before the clock event device is registered and fully initialized. The reason is that the safe guard against spurious interrupts solely checks for the clockevents shutdown state, but lacks a check for detached state. If the interrupt hits while the device is in detached state it passes the safe guard and dereferences the event handler call back which is NULL. Add the missing state check. Fixes: 8f9327cbb6e8 ("clockevents/drivers/cs5535: Migrate to new 'set-state' interface") Suggested-by: Thomas Gleixner Signed-off-by: David Kozub Signed-off-by: Thomas Gleixner Cc: Daniel Lezcano Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20171020093103.3317F6004D@linux.fjfi.cvut.cz --- diff --git a/drivers/clocksource/cs5535-clockevt.c b/drivers/clocksource/cs5535-clockevt.c index a1df588..1de8cac 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_detached(&cs5535_clockevent) || + clockevent_state_shutdown(&cs5535_clockevent)) return IRQ_HANDLED; /* Clear the counter */