[PATCH 09/22] Input: drv2667 - use guard notation when acquiring mutex

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

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@gmail.com>
---
 drivers/input/misc/drv2667.c | 44 +++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 23 deletions(-)

diff --git a/drivers/input/misc/drv2667.c b/drivers/input/misc/drv2667.c
index ad49845374b9..906292625f84 100644
--- a/drivers/input/misc/drv2667.c
+++ b/drivers/input/misc/drv2667.c
@@ -402,59 +402,57 @@ static int drv2667_probe(struct i2c_client *client)
 static int drv2667_suspend(struct device *dev)
 {
 	struct drv2667_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, DRV2667_CTRL_2,
-					 DRV2667_STANDBY, DRV2667_STANDBY);
-		if (ret) {
+		error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
+					   DRV2667_STANDBY, DRV2667_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,
 					   DRV2667_CTRL_2,
 					   DRV2667_STANDBY, 0);
+			return error;
 		}
 	}
-out:
-	mutex_unlock(&haptics->input_dev->mutex);
-	return ret;
+
+	return 0;
 }
 
 static int drv2667_resume(struct device *dev)
 {
 	struct drv2667_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, DRV2667_CTRL_2,
-					 DRV2667_STANDBY, 0);
-		if (ret) {
+		error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
+					   DRV2667_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(drv2667_pm_ops, drv2667_suspend, drv2667_resume);
-- 
2.46.0.469.g59c65b2a67-goog