ALSA: vmaster: Fix slave change notification

When a value of a vmaster slave control is changed, the ctl change
notification is sometimes ignored.  This happens when the master
control overrides, e.g. when the corresponding master control is
muted.  The reason is that slave_put() returns the value of the actual
slave put callback, and it doesn't reflect the virtual slave value
change.

This patch fixes the function just to return 1 whenever a slave value
is changed.

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

diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c
index 857586135d1820ee9310b2794716f4aef2c903eb..0097f3619faae2b955757a83377f171872b35b75 100644 (file)
--- a/sound/core/vmaster.c
+++ b/sound/core/vmaster.c
@@ -213,7 +213,10 @@ static int slave_put(struct snd_kcontrol *kcontrol,
        }
        if (!changed)
                return 0;
-       return slave_put_val(slave, ucontrol);
+       err = slave_put_val(slave, ucontrol);
+       if (err < 0)
+               return err;
+       return 1;
 }
 
 static int slave_tlv_cmd(struct snd_kcontrol *kcontrol,