tree 092e1575eb7c098670ebebd568566067e11a8c32
parent a6c47a85b8e7e4a8c47394607c5e5c43224b0892
author Clemens Ladisch <clemens@ladisch.de> 1297350944 +0100
committer Takashi Iwai <tiwai@suse.de> 1297360409 +0100

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>