This is a note to let you know that I've just added the patch titled
ALSA: hrtimer: handle delayed timer interrupts
to the 2.6.32-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.32.git;a=summary
The filename of the patch is:
alsa-hrtimer-handle-delayed-timer-interrupts.patch
and it can be found in the queue-2.6.32 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.32 longterm
tree,
please let <[email protected]> know about it.
>From b1d4f7f4bdcf9915c41ff8cfc4425c84dabb1fde Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <[email protected]>
Date: Thu, 10 Feb 2011 16:15:44 +0100
Subject: ALSA: hrtimer: handle delayed timer interrupts
From: Clemens Ladisch <[email protected]>
commit b1d4f7f4bdcf9915c41ff8cfc4425c84dabb1fde upstream.
If a timer interrupt was delayed too much, hrtimer_forward_now() will
forward the timer expiry more than once. When this happens, the
additional number of elapsed ALSA timer ticks must be passed to
snd_timer_interrupt() to prevent the ALSA timer from falling behind.
This mostly fixes MIDI slowdown problems on highly-loaded systems with
badly behaved interrupt handlers.
Signed-off-by: Clemens Ladisch <[email protected]>
Reported-and-tested-by: Arthur Marsh <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
sound/core/hrtimer.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/sound/core/hrtimer.c
+++ b/sound/core/hrtimer.c
@@ -44,12 +44,13 @@ static enum hrtimer_restart snd_hrtimer_
{
struct snd_hrtimer *stime = container_of(hrt, struct snd_hrtimer, hrt);
struct snd_timer *t = stime->timer;
+ unsigned long oruns;
if (!atomic_read(&stime->running))
return HRTIMER_NORESTART;
- hrtimer_forward_now(hrt, ns_to_ktime(t->sticks * resolution));
- snd_timer_interrupt(stime->timer, t->sticks);
+ oruns = hrtimer_forward_now(hrt, ns_to_ktime(t->sticks * resolution));
+ snd_timer_interrupt(stime->timer, t->sticks * oruns);
if (!atomic_read(&stime->running))
return HRTIMER_NORESTART;
Patches currently in longterm-queue-2.6.32 which might be from
[email protected] are
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