linux-kernel - [PATCH 5.16 145/227] ASoC: ops: Fix stereo change notifications in snd_soc_put_volsw

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Date:   Mon, 21 Feb 2022 09:49:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.16 145/227] ASoC: ops: Fix stereo change notifications in snd_soc_put_volsw_sx()

From: Mark Brown <broonie@...nel.org>

commit 7f3d90a3519680dfa23e750f80bfdefc0f5eda4a upstream.

When writing out a stereo control we discard the change notification from
the first channel, meaning that events are only generated based on changes
to the second channel. Ensure that we report a change if either channel
has changed.

Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20220201155629.120510-3-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/soc/soc-ops.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -427,6 +427,7 @@ int snd_soc_put_volsw_sx(struct snd_kcon
 	int min = mc->min;
 	unsigned int mask = (1U << (fls(min + max) - 1)) - 1;
 	int err = 0;
+	int ret;
 	unsigned int val, val_mask;
 
 	val = ucontrol->value.integer.value[0];
@@ -443,6 +444,7 @@ int snd_soc_put_volsw_sx(struct snd_kcon
 	err = snd_soc_component_update_bits(component, reg, val_mask, val);
 	if (err < 0)
 		return err;
+	ret = err;
 
 	if (snd_soc_volsw_is_stereo(mc)) {
 		unsigned int val2;
@@ -453,6 +455,11 @@ int snd_soc_put_volsw_sx(struct snd_kcon
 
 		err = snd_soc_component_update_bits(component, reg2, val_mask,
 			val2);
+
+		/* Don't discard any error code or drop change flag */
+		if (ret == 0 || err < 0) {
+			ret = err;
+		}
 	}
 	return err;
 }