[PATCH 5.4 51/88] ASoC: qdsp6: q6routing: Fix return value from msm_routing_put_audio_mixer

Greg Kroah-Hartman
2021-12-13T10:00:44Z

From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

commit 4739d88ad8e1900f809f8a5c98f3c1b65bf76220 upstream.

msm_routing_put_audio_mixer() can return incorrect value in various scenarios.

scenario 1:
amixer cset iface=MIXER,name='SLIMBUS_0_RX Audio Mixer MultiMedia1' 1
amixer cset iface=MIXER,name='SLIMBUS_0_RX Audio Mixer MultiMedia1' 0

return value is 0 instead of 1 eventhough value was changed

scenario 2:
amixer cset iface=MIXER,name='SLIMBUS_0_RX Audio Mixer MultiMedia1' 1
amixer cset iface=MIXER,name='SLIMBUS_0_RX Audio Mixer MultiMedia1' 1

return value is 1 instead of 0 eventhough the value was not changed

scenario 3:
amixer cset iface=MIXER,name='SLIMBUS_0_RX Audio Mixer MultiMedia1' 0
return value is 1 instead of 0 eventhough the value was not changed

Fix this by adding checks, so that change notifications are sent correctly.

Fixes: e3a33673e845 ("ASoC: qdsp6: q6routing: Add q6routing driver")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20211130163110.5628-1-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/soc/qcom/qdsp6/q6routing.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

--- a/sound/soc/qcom/qdsp6/q6routing.c
+++ b/sound/soc/qcom/qdsp6/q6routing.c
@@ -440,14 +440,16 @@ static int msm_routing_put_audio_mixer(s
struct session_data *session = &data->sessions[session_id];

if (ucontrol->value.integer.value[0]) {
+ if (session->port_id == be_id)
+ return 0;
+
session->port_id = be_id;
snd_soc_dapm_mixer_update_power(dapm, kcontrol, 1, update);
} else {
- if (session->port_id == be_id) {
- session->port_id = -1;
+ if (session->port_id == -1 || session->port_id != be_id)
return 0;
- }

+ session->port_id = -1;
snd_soc_dapm_mixer_update_power(dapm, kcontrol, 0, update);
}