[ALSA] hda-codec - Don't create vmaster if no slaves found

Don't create vmaster controls if no slaves are found in the given list.
This prevents the error due to an empty vmaster control.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 5c6419e..37c4139 100644 (file)
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1055,6 +1055,12 @@ int snd_hda_add_vmaster(struct hda_codec *codec, char *name,
        const char **s;
        int err;
 
+       for (s = slaves; *s && !snd_hda_find_mixer_ctl(codec, *s); s++)
+               ;
+       if (!*s) {
+               snd_printdd("No slave found for %s\n", name);
+               return 0;
+       }
        kctl = snd_ctl_make_virtual_master(name, tlv);
        if (!kctl)
                return -ENOMEM;