Commit d87f741d authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

rtc: handle alarms with a minute resolution 



Handle alarms with a minute resolution in the core. Until now drivers have
been open coding the seconds part removal and have been doing that wrongly.
Most of them are rounding up which means the allow the system to miss
deadlines. So, round down and let __rtc_set_alarm return immediately if the
time has already passed.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211107225458.111068-1-alexandre.belloni@bootlin.com
parent 72e4ee63

drivers/rtc/interface.c

+11 −1
Original line number Diff line number Diff line
@@ -423,6 +423,7 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) 
	if (err)

		return err;

	now = rtc_tm_to_time64(&tm);



	if (scheduled <= now)

		return -ETIME;

	/*
@@ -447,6 +448,7 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) 


int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)

{

	ktime_t alarm_time;

	int err;



	if (!rtc->ops)
@@ -468,7 +470,15 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) 
	if (rtc->aie_timer.enabled)

		rtc_timer_remove(rtc, &rtc->aie_timer);



	rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time);

	alarm_time = rtc_tm_to_ktime(alarm->time);

	/*

	 * Round down so we never miss a deadline, checking for past deadline is

	 * done in __rtc_set_alarm

	 */

	if (test_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->features))

		alarm_time = ktime_sub_ns(alarm_time, (u64)alarm->time.tm_sec * NSEC_PER_SEC);



	rtc->aie_timer.node.expires = alarm_time;

	rtc->aie_timer.period = 0;

	if (alarm->enabled)

		err = rtc_timer_enqueue(rtc, &rtc->aie_timer);