summaryrefslogtreecommitdiffstats
path: root/drivers/rtc/rtc-cmos.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/rtc/rtc-cmos.c')
-rw-r--r--drivers/rtc/rtc-cmos.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index ab455ddb16cf..ff7539a4dbea 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -472,10 +472,22 @@ static struct cmos_rtc cmos_rtc;
static irqreturn_t cmos_interrupt(int irq, void *p)
{
u8 irqstat;
+ u8 rtc_control;
spin_lock(&rtc_lock);
irqstat = CMOS_READ(RTC_INTR_FLAGS);
- irqstat &= (CMOS_READ(RTC_CONTROL) & RTC_IRQMASK) | RTC_IRQF;
+ rtc_control = CMOS_READ(RTC_CONTROL);
+ irqstat &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
+
+ /* All Linux RTC alarms should be treated as if they were oneshot.
+ * Similar code may be needed in system wakeup paths, in case the
+ * alarm woke the system.
+ */
+ if (irqstat & RTC_AIE) {
+ rtc_control &= ~RTC_AIE;
+ CMOS_WRITE(rtc_control, RTC_CONTROL);
+ CMOS_READ(RTC_INTR_FLAGS);
+ }
spin_unlock(&rtc_lock);
if (is_intr(irqstat)) {
OpenPOWER on IntegriCloud