linux-kernel - [PATCH] ASoC: mediatek: mt6359: Fix unexpected error in bind/unbind flow

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Date:   Wed, 15 Sep 2021 11:46:59 +0800
From:   Trevor Wu <trevor.wu@...iatek.com>
To:     <broonie@...nel.org>, <tiwai@...e.com>, <matthias.bgg@...il.com>
CC:     <trevor.wu@...iatek.com>, <alsa-devel@...a-project.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <shane.chien@...iatek.com>,
        <chipeng.chang@...iatek.com>, <jiaxin.yu@...iatek.com>,
        <tzungbi@...gle.com>
Subject: [PATCH] ASoC: mediatek: mt6359: Fix unexpected error in bind/unbind flow

mt6359-sound is a MFD driver. Because its regmap is retrieved from its
parent, it shouldn't be freed in mt6359-sound driver.

snd_soc_component_exit_regmap() will do regmap_exit(), this results in
unexpected results if sound card unregister flow is invoked when users
try to bind/unbind audio codec.

Remove the usage of snd_soc_component_exit_regmap(). Instead, set
component->regmap = NULL in the component remove function.

Signed-off-by: Trevor Wu <trevor.wu@...iatek.com>
---
 sound/soc/codecs/mt6359.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/mt6359.c b/sound/soc/codecs/mt6359.c
index 2d6a4a29b850..f8532aa7e4aa 100644
--- a/sound/soc/codecs/mt6359.c
+++ b/sound/soc/codecs/mt6359.c
@@ -2697,7 +2697,7 @@ static int mt6359_codec_probe(struct snd_soc_component *cmpnt)
 
 static void mt6359_codec_remove(struct snd_soc_component *cmpnt)
 {
-	snd_soc_component_exit_regmap(cmpnt);
+	cmpnt->regmap = NULL;
 }
 
 static const DECLARE_TLV_DB_SCALE(hp_playback_tlv, -2200, 100, 0);
-- 
2.18.0