[alsa-devel] [PATCH] ASoC: dapm: Fix snd_soc_dapm_put_volsw() connect

[Benoît Thébaudeau]

snd_soc_dapm_put_volsw() sets connect incorrectly in the case max > 1 with
invert. In that case, the raw disconnect value should be max, which corresponds
to the userspace value 0.

This use case currently does not appear upstream, but it could break
SOC_DAPM_SINGLE() or SOC_DAPM_SINGLE_TLV() elsewhere or in the future.

Cc: Liam Girdwood <lrg at ti.com>
Cc: Mark Brown <broonie at opensource.wolfsonmicro.com>
Cc: <alsa-devel at alsa-project.org>
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau at advansee.com>
---
 .../sound/soc/soc-dapm.c                           |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git linux-next-HEAD-6c86b58.orig/sound/soc/soc-dapm.c linux-next-HEAD-6c86b58/sound/soc/soc-dapm.c
index 405841c..5ef082f 100644
--- linux-next-HEAD-6c86b58.orig/sound/soc/soc-dapm.c
+++ linux-next-HEAD-6c86b58/sound/soc/soc-dapm.c
@@ -2515,19 +2515,13 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
 	int wi;
 
 	val = (ucontrol->value.integer.value[0] & mask);
+	connect = !!val;
 
 	if (invert)
 		val = max - val;
 	mask = mask << shift;
 	val = val << shift;
 
-	if (val)
-		/* new connection */
-		connect = invert ? 0 : 1;
-	else
-		/* old connection must be powered down */
-		connect = invert ? 1 : 0;
-
 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
 
 	change = snd_soc_test_bits(widget->codec, reg, mask, val);