[PATCH v1 1/4] ASoC: ops: Fix stereo change notifications in snd_soc_put_volsw()

[Mark Brown]

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 at kernel.org>
Cc: stable at vger.kernel.org
---
 sound/soc/soc-ops.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 08eaa9ddf191..73c9d53de25b 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -308,7 +308,7 @@ int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
 	unsigned int sign_bit = mc->sign_bit;
 	unsigned int mask = (1 << fls(max)) - 1;
 	unsigned int invert = mc->invert;
-	int err;
+	int err, ret;
 	bool type_2r = false;
 	unsigned int val2 = 0;
 	unsigned int val, val_mask;
@@ -336,12 +336,18 @@ int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
 	err = snd_soc_component_update_bits(component, reg, val_mask, val);
 	if (err < 0)
 		return err;
+	ret = err;
 
-	if (type_2r)
+	if (type_2r) {
 		err = snd_soc_component_update_bits(component, reg2, val_mask,
-			val2);
+						    val2);
+		/* Don't discard any error code or drop change flag */
+		if (ret == 0 || err < 0) {
+			ret = err;
+		}
+	}
 
-	return err;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_put_volsw);
 
-- 
2.30.2