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authorAlessandro Zummo <a.zummo@towertech.it>2014-04-03 14:50:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-03 16:21:22 -0700
commit131c9cc832162bfe45be1065fa88d1ec2c165a3d (patch)
tree6a5ede933809e4d50c382af08178e8d6dbd41863 /drivers/rtc
parentc93a3ae2d213ff75a279fe6e28d8f41ca7f01483 (diff)
downloadlinux-131c9cc832162bfe45be1065fa88d1ec2c165a3d.tar.bz2
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>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/interface.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 544be722937c..c2eff6082363 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -584,6 +584,9 @@ enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer)
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);
}