linux-kernel - [PATCH 4.4 28/31] ALSA: hda - fix the 'Capture Switch' value change notifications

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Message-Id: <20210824170743.710957-29-sashal@kernel.org>
Date:   Tue, 24 Aug 2021 13:07:40 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jaroslav Kysela <perex@...ex.cz>, stable@...nel.org,
        Takashi Iwai <tiwai@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 28/31] ALSA: hda - fix the 'Capture Switch' value change notifications

From: Jaroslav Kysela <perex@...ex.cz>

[ Upstream commit a2befe9380dd04ee76c871568deca00eedf89134 ]

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@...nel.org>
Signed-off-by: Jaroslav Kysela <perex@...ex.cz>
Link: https://lore.kernel.org/r/20210811161441.1325250-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/pci/hda/hda_generic.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index 7fed8d1bb79c..5c708d9851b8 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -3442,7 +3442,7 @@ 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;
@@ -3452,9 +3452,13 @@ 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)
-- 
2.30.2