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ALSA: hda/realtek - Fix Oops in alc_mux_select()
authorTakashi Iwai <tiwai@suse.de>
Fri, 2 Dec 2011 14:29:12 +0000 (15:29 +0100)
committerTakashi Iwai <tiwai@suse.de>
Fri, 2 Dec 2011 14:29:12 +0000 (15:29 +0100)
When no imux is available (e.g. a single capture source),
alc_auto_init_input_src() may trigger an Oops due to the access to -1.
Add a proper zero-check to avoid it.

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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