From: Omair Mohammed Abdullah <omair.m.abdullah@linux.intel.com>
Date: Sat, 29 Sep 2012 06:54:05 +0000 (+0530)
Subject: ALSA: aloop - add locking to timer access
X-Git-Tag: v3.2.32~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1fd7e28a2d9dec2c758bf43b92b1613dd22161d6;p=pandora-kernel.git

ALSA: aloop - add locking to timer access

commit d4f1e48bd11e3df6a26811f7a1f06c4225d92f7d upstream.

When the loopback timer handler is running, calling del_timer() (for STOP
trigger) will not wait for the handler to complete before deactivating the
timer. The timer gets rescheduled in the handler as usual. Then a subsequent
START trigger will try to start the timer using add_timer() with a timer pending
leading to a kernel panic.

Serialize the calls to add_timer() and del_timer() using a spin lock to avoid
this.

Signed-off-by: Omair Mohammed Abdullah <omair.m.abdullah@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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