From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 15 Oct 2012 10:16:02 +0000 (+0200)
Subject: ALSA: usb-audio: Use rwsem for disconnect protection
X-Git-Tag: v3.7-rc4~18^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=34f3c89fda4fba9fe689db22253ca8db2f5e6386;p=pandora-kernel.git

ALSA: usb-audio: Use rwsem for disconnect protection

Replace mutex with rwsem for codec->shutdown protection so that
concurrent accesses are allowed.

Also add the protection to snd_usb_autosuspend() and
snd_usb_autoresume(), too.

Reported-by: Matthieu CASTET <matthieu.castet@parrot.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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