iio: amplifiers: ad8366: use cleanup.h mutex guard

use guard() from cleanup for mutex locking.
replace mutex_init() for devm_mutex_init().

Signed-off-by: Rodrigo Alencar <[email protected]>

Author: rodrigo455

drivers/iio/amplifiers/ad8366.c

@@ -17,6 +17,7 @@
  * Copyright 2012-2025 Analog Devices Inc.
  */
 
+#include <linux/cleanup.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
@@ -53,7 +54,7 @@ struct ad8366_info {
 struct ad8366_state {
 	struct spi_device	*spi;
 	struct regulator	*reg;
-	struct mutex            lock; /* protect sensor state */
+	struct mutex		lock; /* protect sensor state */
 	struct gpio_desc	*reset_gpio;
 	struct gpio_desc	*enable_gpio;
 	unsigned char		ch[2];
@@ -164,7 +165,8 @@ static int ad8366_read_raw(struct iio_dev *indio_dev,
 	int ret;
 	int code, gain = 0;
 
-	mutex_lock(&st->lock);
+	guard(mutex)(&st->lock);
+
 	switch (m) {
 	case IIO_CHAN_INFO_HARDWAREGAIN:
 		code = st->ch[chan->channel];
@@ -210,7 +212,6 @@ static int ad8366_read_raw(struct iio_dev *indio_dev,
 	default:
 		ret = -EINVAL;
 	}
-	mutex_unlock(&st->lock);
 
 	return ret;
 };
@@ -267,7 +268,8 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
 		break;
 	}
 
-	mutex_lock(&st->lock);
+	guard(mutex)(&st->lock);
+
 	switch (mask) {
 	case IIO_CHAN_INFO_HARDWAREGAIN:
 		st->ch[chan->channel] = code;
@@ -276,7 +278,6 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
 	default:
 		ret = -EINVAL;
 	}
-	mutex_unlock(&st->lock);
 
 	return ret;
 }
@@ -323,7 +324,7 @@ static int ad8366_probe(struct spi_device *spi)
 	int ret;
 
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
-	if (indio_dev == NULL)
+	if (!indio_dev)
 		return -ENOMEM;
 
 	st = iio_priv(indio_dev);
@@ -336,10 +337,13 @@ static int ad8366_probe(struct spi_device *spi)
 	}
 
 	spi_set_drvdata(spi, indio_dev);
-	mutex_init(&st->lock);
 	st->spi = spi;
 	st->type = spi_get_device_id(spi)->driver_data;
 
+	ret = devm_mutex_init(&spi->dev, &st->lock);
+	if (ret)
+		return ret;
+
 	switch (st->type) {
 	case ID_AD8366:
 		indio_dev->channels = ad8366_channels;