[PATCH 08/22] Input: drv2665 - 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/drv2665.c | 44 +++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 23 deletions(-)

diff --git a/drivers/input/misc/drv2665.c b/drivers/input/misc/drv2665.c
index f98e4d765307..77ec96c7db76 100644
--- a/drivers/input/misc/drv2665.c
+++ b/drivers/input/misc/drv2665.c
@@ -225,59 +225,57 @@ static int drv2665_probe(struct i2c_client *client)
 static int drv2665_suspend(struct device *dev)
 {
 	struct drv2665_data *haptics = dev_get_drvdata(dev);
-	int ret = 0;
+	int error;
 
-	mutex_lock(&haptics->input_dev->mutex);
+	guard(mutex)(&haptics->input_dev->mutex);
 
 	if (input_device_enabled(haptics->input_dev)) {
-		ret = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
-					 DRV2665_STANDBY, DRV2665_STANDBY);
-		if (ret) {
+		error = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
+					   DRV2665_STANDBY, DRV2665_STANDBY);
+		if (error) {
 			dev_err(dev, "Failed to set standby mode\n");
 			regulator_disable(haptics->regulator);
-			goto out;
+			return error;
 		}
 
-		ret = regulator_disable(haptics->regulator);
-		if (ret) {
+		error = regulator_disable(haptics->regulator);
+		if (error) {
 			dev_err(dev, "Failed to disable regulator\n");
 			regmap_update_bits(haptics->regmap,
 					   DRV2665_CTRL_2,
 					   DRV2665_STANDBY, 0);
+			return error;
 		}
 	}
-out:
-	mutex_unlock(&haptics->input_dev->mutex);
-	return ret;
+
+	return 0;
 }
 
 static int drv2665_resume(struct device *dev)
 {
 	struct drv2665_data *haptics = dev_get_drvdata(dev);
-	int ret = 0;
+	int error;
 
-	mutex_lock(&haptics->input_dev->mutex);
+	guard(mutex)(&haptics->input_dev->mutex);
 
 	if (input_device_enabled(haptics->input_dev)) {
-		ret = regulator_enable(haptics->regulator);
-		if (ret) {
+		error = regulator_enable(haptics->regulator);
+		if (error) {
 			dev_err(dev, "Failed to enable regulator\n");
-			goto out;
+			return error;
 		}
 
-		ret = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
-					 DRV2665_STANDBY, 0);
-		if (ret) {
+		error = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
+					   DRV2665_STANDBY, 0);
+		if (error) {
 			dev_err(dev, "Failed to unset standby mode\n");
 			regulator_disable(haptics->regulator);
-			goto out;
+			return error;
 		}
 
 	}
 
-out:
-	mutex_unlock(&haptics->input_dev->mutex);
-	return ret;
+	return 0;
 }
 
 static DEFINE_SIMPLE_DEV_PM_OPS(drv2665_pm_ops, drv2665_suspend, drv2665_resume);
-- 
2.46.0.469.g59c65b2a67-goog