ALSA: hda - fix the 'Capture Switch' value change notifications

The original code in the cap_put_caller() function does not
handle correctly the positive values returned from the passed
function for multiple iterations. It means that the change
notifications may be lost.

Fixes: 352f7f914ebb ("ALSA: hda - Merge Realtek parser code to generic parser")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=213851
Cc: <stable@kernel.org>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210811161441.1325250-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index e97d005..481d8f8 100644 (file)
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -3460,7 +3460,7 @@ static int cap_put_caller(struct snd_kcontrol *kcontrol,
        struct hda_gen_spec *spec = codec->spec;
        const struct hda_input_mux *imux;
        struct nid_path *path;
-       int i, adc_idx, err = 0;
+       int i, adc_idx, ret, err = 0;
 
        imux = &spec->input_mux;
        adc_idx = kcontrol->id.index;
@@ -3470,9 +3470,13 @@ static int cap_put_caller(struct snd_kcontrol *kcontrol,
                if (!path || !path->ctls[type])
                        continue;
                kcontrol->private_value = path->ctls[type];
-               err = func(kcontrol, ucontrol);
-               if (err < 0)
+               ret = func(kcontrol, ucontrol);
+               if (ret < 0) {
+                       err = ret;
                        break;
+               }
+               if (ret > 0)
+                       err = 1;
        }
        mutex_unlock(&codec->control_mutex);
        if (err >= 0 && spec->cap_sync_hook)