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ALSA: usb-audio: Use rwsem for disconnect protection
authorTakashi Iwai <tiwai@suse.de>
Mon, 15 Oct 2012 10:16:02 +0000 (12:16 +0200)
committerTakashi Iwai <tiwai@suse.de>
Tue, 30 Oct 2012 10:07:00 +0000 (11:07 +0100)
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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