[PATCH 16/22] Input: max8997_haptic - use guard notation when acquiring mutex

[Dmitry Torokhov]

Using guard notation makes the code more compact and error handling
more robust by ensuring that mutexes are released in all code paths
when control leaves critical section.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
 drivers/input/misc/max8997_haptic.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/input/misc/max8997_haptic.c b/drivers/input/misc/max8997_haptic.c
index 11cac4b7dddc..2853455daef2 100644
--- a/drivers/input/misc/max8997_haptic.c
+++ b/drivers/input/misc/max8997_haptic.c
@@ -153,19 +153,19 @@ static void max8997_haptic_enable(struct max8997_haptic *chip)
 {
 	int error;
 
-	mutex_lock(&chip->mutex);
+	guard(mutex)(&chip->mutex);
 
 	error = max8997_haptic_set_duty_cycle(chip);
 	if (error) {
 		dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
-		goto out;
+		return;
 	}
 
 	if (!chip->enabled) {
 		error = regulator_enable(chip->regulator);
 		if (error) {
 			dev_err(chip->dev, "Failed to enable regulator\n");
-			goto out;
+			return;
 		}
 		max8997_haptic_configure(chip);
 		if (chip->mode == MAX8997_EXTERNAL_MODE) {
@@ -173,19 +173,16 @@ static void max8997_haptic_enable(struct max8997_haptic *chip)
 			if (error) {
 				dev_err(chip->dev, "Failed to enable PWM\n");
 				regulator_disable(chip->regulator);
-				goto out;
+				return;
 			}
 		}
 		chip->enabled = true;
 	}
-
-out:
-	mutex_unlock(&chip->mutex);
 }
 
 static void max8997_haptic_disable(struct max8997_haptic *chip)
 {
-	mutex_lock(&chip->mutex);
+	guard(mutex)(&chip->mutex);
 
 	if (chip->enabled) {
 		chip->enabled = false;
@@ -194,8 +191,6 @@ static void max8997_haptic_disable(struct max8997_haptic *chip)
 			pwm_disable(chip->pwm);
 		regulator_disable(chip->regulator);
 	}
-
-	mutex_unlock(&chip->mutex);
 }
 
 static void max8997_haptic_play_effect_work(struct work_struct *work)
-- 
2.46.0.469.g59c65b2a67-goog