diff options
| author | Clemens Ladisch <clemens@ladisch.de> | 2011-02-10 16:15:44 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-17 15:36:59 -0800 |
| commit | 9f2d7ebc444664e791e357075ebb80174fb7daf6 (patch) | |
| tree | 79e67e7bb35a00d67ca5822319ca4caf10202f41 | |
| parent | 1e81d74b8bbd77d990a367cbe380637eaa12513d (diff) | |
ALSA: hrtimer: handle delayed timer interrupts
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 <clemens@ladisch.de>
Reported-and-tested-by: Arthur Marsh <arthur.marsh@internode.on.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@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 7f4d744ae40..2475bda849b 100644 --- a/sound/core/hrtimer.c +++ b/sound/core/hrtimer.c @@ -44,12 +44,13 @@ 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; |