ASoC: DAPM: Fix missing kctl change notifications

The put callback of a kcontrol is supposed to return 1 when the value
is changed, and this will be notified to user-space.  However, some
DAPM kcontrols always return 0 (except for errors), hence the
user-space misses the update of a control value.

This patch corrects the behavior by properly returning 1 when the
value gets updated.

Reported-and-tested-by: Hans de Goede <hdegoede@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20211006141712.2439-1-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 7b67f1e..59d0764 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -2561,6 +2561,7 @@ static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
                                const char *pin, int status)
 {
        struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
+       int ret = 0;
 
        dapm_assert_locked(dapm);
 
@@ -2573,13 +2574,14 @@ static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
                dapm_mark_dirty(w, "pin configuration");
                dapm_widget_invalidate_input_paths(w);
                dapm_widget_invalidate_output_paths(w);
+               ret = 1;
        }
 
        w->connected = status;
        if (status == 0)
                w->force = 0;
 
-       return 0;
+       return ret;
 }
 
 /**
@@ -3583,14 +3585,15 @@ int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
 {
        struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
        const char *pin = (const char *)kcontrol->private_value;
+       int ret;
 
        if (ucontrol->value.integer.value[0])
-               snd_soc_dapm_enable_pin(&card->dapm, pin);
+               ret = snd_soc_dapm_enable_pin(&card->dapm, pin);
        else
-               snd_soc_dapm_disable_pin(&card->dapm, pin);
+               ret = snd_soc_dapm_disable_pin(&card->dapm, pin);
 
        snd_soc_dapm_sync(&card->dapm);
-       return 0;
+       return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
 
@@ -4023,7 +4026,7 @@ static int snd_soc_dapm_dai_link_put(struct snd_kcontrol *kcontrol,
 
        rtd->params_select = ucontrol->value.enumerated.item[0];
 
-       return 0;
+       return 1;
 }
 
 static void