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authorJohn Stultz <john.stultz@linaro.org>2011-01-20 15:26:13 -0800
committerThomas Gleixner <tglx@linutronix.de>2011-01-21 17:38:19 +0100
commitd5553a556165535337ece8592f066407c62eec2e (patch)
tree2b9eaf6a5b9a4939f92cadedf6c797070107e7af /drivers/rtc
parentaa0be0f4659f91f31e45adc422b1788cb36ffddc (diff)
downloadlinux-2.6.38-lt-ux500-d5553a556165535337ece8592f066407c62eec2e.tar.gz
RTC: Properly handle rtc_read_alarm error propagation and fix bug
In reviewing cases where the virtualized interfaces didn't propagate errors properly, I noticed rtc_read_alarm needed fixing. In doing so I noticed my RTC rework dropped a memset and that the behavior of rtc_read_alarm shouldn't be conditionalized on the alarm.enabled flag (as the alarm may be set, but the irqs may be disabled). So those were corrected as well. CC: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org> LKML-Reference: <1295565973-14358-2-git-send-email-john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/interface.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index f1ba2c69652..925006d3310 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -123,12 +123,18 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
err = mutex_lock_interruptible(&rtc->ops_lock);
if (err)
return err;
- alarm->enabled = rtc->aie_timer.enabled;
- if (alarm->enabled)
+ if (rtc->ops == NULL)
+ err = -ENODEV;
+ else if (!rtc->ops->read_alarm)
+ err = -EINVAL;
+ else {
+ memset(alarm, 0, sizeof(struct rtc_wkalrm));
+ alarm->enabled = rtc->aie_timer.enabled;
alarm->time = rtc_ktime_to_tm(rtc->aie_timer.node.expires);
+ }
mutex_unlock(&rtc->ops_lock);
- return 0;
+ return err;
}
EXPORT_SYMBOL_GPL(rtc_read_alarm);