[PATCH 05/10] ASoC: mediatek: mt8192: mt8192-afe-gpio: Use guard() for mutex locks

[phucduc.bui@gmail.com]

From: bui duc phuc <phucduc.bui@gmail.com>

Convert the explicit mutex_lock()/mutex_unlock() pair to guard(mutex)
to simplify the locking logic and automatically release the mutex on
all exit paths.

This changes the mutex release point from immediately before dev_warn()
to automatic cleanup at scope exit. However, the affected path only emits
a warning and immediately returns -EINVAL, without any further processing.

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---
 sound/soc/mediatek/mt8192/mt8192-afe-gpio.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/sound/soc/mediatek/mt8192/mt8192-afe-gpio.c b/sound/soc/mediatek/mt8192/mt8192-afe-gpio.c
index de5e1deaa167..b993ca2dbd7c 100644
--- a/sound/soc/mediatek/mt8192/mt8192-afe-gpio.c
+++ b/sound/soc/mediatek/mt8192/mt8192-afe-gpio.c
@@ -208,7 +208,7 @@ static int mt8192_afe_gpio_adda_ch34_ul(struct device *dev, bool enable)
 int mt8192_afe_gpio_request(struct device *dev, bool enable,
 			    int dai, int uplink)
 {
-	mutex_lock(&gpio_request_mutex);
+	guard(mutex)(&gpio_request_mutex);
 	switch (dai) {
 	case MT8192_DAI_ADDA:
 		if (uplink)
@@ -296,11 +296,9 @@ int mt8192_afe_gpio_request(struct device *dev, bool enable,
 		}
 		break;
 	default:
-		mutex_unlock(&gpio_request_mutex);
 		dev_warn(dev, "%s(), invalid dai %d\n", __func__, dai);
 		return -EINVAL;
 	}
-	mutex_unlock(&gpio_request_mutex);
 
 	return 0;
 }
-- 
2.43.0