From: Clemens Ladisch <clemens@ladisch.de>
Date: Thu, 10 Feb 2011 15:15:44 +0000 (+0100)
Subject: ALSA: hrtimer: handle delayed timer interrupts
X-Git-Tag: v2.6.37.1~171
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=deab83237341ae1a0fcf8dc399a76b7c4afced1b;p=pandora-kernel.git

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>
---

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