alarmtimer: Return correct remaining time

To calculate a remaining time, it's required to subtract the current time
from the expiration time. In alarm_timer_remaining() the arguments of
ktime_sub are swapped.

Fixes: d653d8457c76 ("alarmtimer: Implement remaining callback")
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20190408041542.26338-1-avagin@gmail.com

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 2c97e8c2d29fb3351332e447323750247d950f58..0519a8805aab3f290e3fb437ff0903a0e4722d90 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -594,7 +594,7 @@ static ktime_t alarm_timer_remaining(struct k_itimer *timr, ktime_t now)
 {
        struct alarm *alarm = &timr->it.alarm.alarmtimer;
 
-       return ktime_sub(now, alarm->node.expires);
+       return ktime_sub(alarm->node.expires, now);
 }
 
 /**