From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 17 Apr 2013 16:16:05 +0000 (+0200)
Subject: ALSA: hda - Don't call vmaster hook when bus->shutdown is set
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~52^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=594813ffa741b4bcdeff85ca09d734117ac93371;p=pandora-kernel.git

ALSA: hda - Don't call vmaster hook when bus->shutdown is set

The flag bus->shutdown implies that the control elements might have
been already destroyed.  When a codec is resumed at this state and
tries to call vmaster hook (e.g. in snd_hda_gen_init()), it would
refer to a non-existing object, resulting in Oops in the end.

This patch just adds a check of the flag in the caller side for
avoiding such a crash.

Though, the best would be to clear hook->sw_kctl by the destructor of
the corresponding ctl element, but vmaster uses its own private_free,
it can't be done easily.  So let it be for a while.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
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