[PATCH v4 1/2] iio: accel: adxl313: convert to guard(mutex)

[Rajveer Chaudhari <rajveer.chaudhari.linux@gmail.com>]

Replace manual mutex_lock/mutex_unlock pair with guard(mutex) in
adxl313_read_axis(). This ensures the mutex is released on all
return paths and allows returning directly without a goto label.

Signed-off-by: Rajveer Chaudhari <rajveer.chaudhari.linux@gmail.com>
---
v4: Keep ret declaration at top of function.
v3: Return directly from regmap_bulk_read error path.
v2: Split into separate patch per driver.
---
 drivers/iio/accel/adxl313_core.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c
index 9f5d4d2cb325..084037c89ad3 100644
--- a/drivers/iio/accel/adxl313_core.c
+++ b/drivers/iio/accel/adxl313_core.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/cleanup.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/overflow.h>
@@ -356,19 +357,15 @@ static int adxl313_read_axis(struct adxl313_data *data,
 {
 	int ret;
 
-	mutex_lock(&data->lock);
+	guard(mutex)(&data->lock);
 
 	ret = regmap_bulk_read(data->regmap,
 			       ADXL313_REG_DATA_AXIS(chan->address),
 			       &data->transf_buf, sizeof(data->transf_buf));
 	if (ret)
-		goto unlock_ret;
-
-	ret = le16_to_cpu(data->transf_buf);
+		return ret;
 
-unlock_ret:
-	mutex_unlock(&data->lock);
-	return ret;
+	return le16_to_cpu(data->transf_buf);
 }
 
 static int adxl313_read_freq_avail(struct iio_dev *indio_dev,
-- 
2.53.0