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| author | Clemens Ladisch <clemens@ladisch.de> | 2011-02-10 16:15:44 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2011-02-10 18:53:29 +0100 |
| commit | b1d4f7f4bdcf9915c41ff8cfc4425c84dabb1fde (patch) | |
| tree | 092e1575eb7c098670ebebd568566067e11a8c32 | |
| parent | a6c47a85b8e7e4a8c47394607c5e5c43224b0892 (diff) | |
| download | linux-3.10-b1d4f7f4bdcf9915c41ff8cfc4425c84dabb1fde.tar.gz linux-3.10-b1d4f7f4bdcf9915c41ff8cfc4425c84dabb1fde.tar.bz2 linux-3.10-b1d4f7f4bdcf9915c41ff8cfc4425c84dabb1fde.zip | |
ALSA: hrtimer: handle delayed timer interrupts
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 <clemens@ladisch.de>
Reported-and-tested-by: Arthur Marsh <arthur.marsh@internode.on.net>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/core/hrtimer.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sound/core/hrtimer.c b/sound/core/hrtimer.c index 7730575bfad..07efa29dfd4 100644 --- a/sound/core/hrtimer.c +++ b/sound/core/hrtimer.c @@ -45,12 +45,13 @@ static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) { 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; |