linux-kernel - [PATCH 4.14 42/69] alarmtimer: Return correct remaining time

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Message-Id: <20190415183733.048867920@linuxfoundation.org>
Date:   Mon, 15 Apr 2019 20:59:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrei Vagin <avagin@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mukesh Ojha <mojha@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>,
        John Stultz <john.stultz@...aro.org>
Subject: [PATCH 4.14 42/69] alarmtimer: Return correct remaining time

From: Andrei Vagin <avagin@...il.com>

commit 07d7e12091f4ab869cc6a4bb276399057e73b0b3 upstream.

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@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>
Cc: Stephen Boyd <sboyd@...nel.org>
Cc: John Stultz <john.stultz@...aro.org>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/20190408041542.26338-1-avagin@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/time/alarmtimer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -597,7 +597,7 @@ static ktime_t alarm_timer_remaining(str
 {
 	struct alarm *alarm = &timr->it.alarm.alarmtimer;
 
-	return ktime_sub(now, alarm->node.expires);
+	return ktime_sub(alarm->node.expires, now);
 }
 
 /**