ALSA: hrtimer: handle delayed timer interrupts

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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>

...

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Clemens Ladisch 2011-02-10 16:15:44 +01:00 • committed by Takashi Iwai

parent a6c47a85b8

commit b1d4f7f4bd

1 changed files with 3 additions and 2 deletions

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sound/core/hrtimer.c

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