ALSA: hda: dinput_mux check

Add check to determine if dinput_mux is set by any of patch_stac*() functions,
otherwise a invalid pointer my be referenced causing gibberish to mixer values.

Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index e2941cd8aeea..7ee4d4df8932 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -3589,7 +3589,8 @@ static int stac92xx_parse_auto_config(struct hda_codec *codec, hda_nid_t dig_out
                 spec->mixers[spec->num_mixers++] = spec->kctls.list;
 
         spec->input_mux = &spec->private_imux;
-        spec->dinput_mux = &spec->private_dimux;
+        if (!spec->dinput_mux)
+                spec->dinput_mux = &spec->private_dimux;
         spec->sinput_mux = &spec->private_smux;
         spec->mono_mux = &spec->private_mono_mux;
         spec->amp_mux = &spec->private_amp_mux;