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rtc: fix alarm read and set offset 

The offset needs to be added after reading the alarm value.

It also needs to be subtracted after the now < alarm test.

Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2018-07-12 12:22:44 +02:00
parent ca95ef7c98
commit fd6792bb02
1 changed files with 5 additions and 3 deletions
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8
drivers/rtc/interface.c
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@ -265,8 +265,10 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
return err;
/* full-function RTCs won't have such missing fields */
if (rtc_valid_tm(&alarm->time) == 0)
if (rtc_valid_tm(&alarm->time) == 0) {
rtc_add_offset(rtc, &alarm->time);
return 0;
}
/* get the "after" timestamp, to detect wrapped fields */
err = rtc_read_time(rtc, &now);
@ -409,7 +411,6 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
if (err)
return err;
rtc_subtract_offset(rtc, &alarm->time);
scheduled = rtc_tm_to_time64(&alarm->time);
/* Make sure we're not setting alarms in the past */
@ -426,6 +427,8 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
* over right here, before we set the alarm.
*/
rtc_subtract_offset(rtc, &alarm->time);
if (!rtc->ops)
err = -ENODEV;
else if (!rtc->ops->set_alarm)
@ -467,7 +470,6 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
mutex_unlock(&rtc->ops_lock);
rtc_add_offset(rtc, &alarm->time);
return err;
}
EXPORT_SYMBOL_GPL(rtc_set_alarm);