[PATCH AUTOSEL for 4.4 58/59] rtc: set the alarm to the next expiring timer

[alexander . levin]

From: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>

[ Upstream commit 74717b28cb32e1ad3c1042cafd76b264c8c0f68d ]

If there is any non expired timer in the queue, the RTC alarm is never set.
This is an issue when adding a timer that expires before the next non
expired timer.

Ensure the RTC alarm is set in that case.

Fixes: 2b2f5ff00f63 ("rtc: interface: ignore expired timers when enqueuing new timers")
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
 drivers/rtc/interface.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 9bb934ed2a7a..dcfd3655ef0a 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -764,7 +764,7 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)
 	}
 
 	timerqueue_add(&rtc->timerqueue, &timer->node);
-	if (!next) {
+	if (!next || ktime_before(timer->node.expires, next->expires)) {
 		struct rtc_wkalrm alarm;
 		int err;
 		alarm.time = rtc_ktime_to_tm(timer->node.expires);
-- 
2.11.0