rtc: verify a critical argument to rtc_update_irq() before using it
This small addition to the core simplifies code in the drivers and makes
them more robust when handling shared IRQs.
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 544be72..c2eff60 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -584,6 +584,9 @@
void rtc_update_irq(struct rtc_device *rtc,
unsigned long num, unsigned long events)
{
+ if (unlikely(IS_ERR_OR_NULL(rtc)))
+ return;
+
pm_stay_awake(rtc->dev.parent);
schedule_work(&rtc->irqwork);
}