Patch "alarmtimer: don't rate limit one-shot timers" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    alarmtimer: don't rate limit one-shot timers

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     alarmtimer-don-t-rate-limit-one-shot-timers.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From ghackmann@google.com  Tue Jul 25 10:58:26 2017
From: Greg Hackmann <ghackmann@google.com>
Date: Mon, 24 Jul 2017 10:19:24 -0700
Subject: alarmtimer: don't rate limit one-shot timers
To: John Stultz <john.stultz@linaro.org>, Thomas Gleixner <tglx@linutronix.de>
Cc: Ben Fennema <fennema@google.com>, linux-kernel@vger.kernel.org, Greg Hackmann <ghackmann@google.com>, stable@vger.kernel.org
Message-ID: <20170724171924.27898-1-ghackmann@google.com>

From: Greg Hackmann <ghackmann@google.com>

Commit ff86bf0c65f1 ("alarmtimer: Rate limit periodic intervals") sets a
minimum bound on the alarm timer interval.  This minimum bound shouldn't
be applied if the interval is 0.  Otherwise, one-shot timers will be
converted into periodic ones.

Fixes: ff86bf0c65f1 ("alarmtimer: Rate limit periodic intervals")
Reported-by: Ben Fennema <fennema@google.com>
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Cc: stable@vger.kernel.org
Cc: John Stultz <john.stultz@linaro.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 kernel/time/alarmtimer.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -629,7 +629,8 @@ static int alarm_timer_set(struct k_itim
 	 * Rate limit to the tick as a hot fix to prevent DOS. Will be
 	 * mopped up later.
 	 */
-	if (ktime_to_ns(timr->it.alarm.interval) < TICK_NSEC)
+	if (timr->it.alarm.interval.tv64 &&
+			ktime_to_ns(timr->it.alarm.interval) < TICK_NSEC)
 		timr->it.alarm.interval = ktime_set(0, TICK_NSEC);
 
 	exp = timespec_to_ktime(new_setting->it_value);


Patches currently in stable-queue which might be from ghackmann@google.com are

queue-4.9/alarmtimer-don-t-rate-limit-one-shot-timers.patch