commit b1d4f7f4bdcf9915c41ff8cfc4425c84dabb1fde
author Clemens Ladisch <clemens@ladisch.de> Thu Feb 10 16:15:44 2011 +0100
committer Takashi Iwai <tiwai@suse.de> Thu Feb 10 18:53:29 2011 +0100
tree 092e1575eb7c098670ebebd568566067e11a8c32
parent a6c47a85b8e7e4a8c47394607c5e5c43224b0892

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>