HID: cp2112: use lock guards

Simplify the code by using the lock guards from linux/cleanup.h
throughout the driver.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

Author: Bartosz Golaszewski

drivers/hid/hid-cp2112.c

@@ -187,7 +187,7 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 	u8 *buf = dev->in_out_buffer;
 	int ret;
 
-	mutex_lock(&dev->lock);
+	guard(mutex)(&dev->lock);
 
 	ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
 				 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
@@ -196,7 +196,7 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 		hid_err(hdev, "error requesting GPIO config: %d\n", ret);
 		if (ret >= 0)
 			ret = -EIO;
-		goto exit;
+		return ret;
 	}
 
 	buf[1] &= ~BIT(offset);
@@ -209,14 +209,10 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 		hid_err(hdev, "error setting GPIO config: %d\n", ret);
 		if (ret >= 0)
 			ret = -EIO;
-		goto exit;
+		return ret;
 	}
 
-	ret = 0;
-
-exit:
-	mutex_unlock(&dev->lock);
-	return ret;
+	return 0;
 }
 
 static void cp2112_gpio_set_unlocked(struct cp2112_device *dev,
@@ -244,7 +240,7 @@ static void cp2112_gpio_set(struct gpio_chip *chip, unsigned int offset,
 
 	guard(mutex)(&dev->lock);
 
-	return cp2112_gpio_set_unlocked(dev, offset, value);
+	cp2112_gpio_set_unlocked(dev, offset, value);
 }
 
 static int cp2112_gpio_get_all(struct gpio_chip *chip)
@@ -254,23 +250,17 @@ static int cp2112_gpio_get_all(struct gpio_chip *chip)
 	u8 *buf = dev->in_out_buffer;
 	int ret;
 
-	mutex_lock(&dev->lock);
+	guard(mutex)(&dev->lock);
 
 	ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf,
 				 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT,
 				 HID_REQ_GET_REPORT);
 	if (ret != CP2112_GPIO_GET_LENGTH) {
 		hid_err(hdev, "error requesting GPIO values: %d\n", ret);
-		ret = ret < 0 ? ret : -EIO;
-		goto exit;
+		return ret < 0 ? ret : -EIO;
 	}
 
-	ret = buf[1];
-
-exit:
-	mutex_unlock(&dev->lock);
-
-	return ret;
+	return buf[1];
 }
 
 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset)
@@ -292,14 +282,14 @@ static int cp2112_gpio_direction_output(struct gpio_chip *chip,
 	u8 *buf = dev->in_out_buffer;
 	int ret;
 
-	mutex_lock(&dev->lock);
+	guard(mutex)(&dev->lock);
 
 	ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
 				 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
 				 HID_REQ_GET_REPORT);
 	if (ret != CP2112_GPIO_CONFIG_LENGTH) {
 		hid_err(hdev, "error requesting GPIO config: %d\n", ret);
-		goto fail;
+		return ret < 0 ? ret : -EIO;
 	}
 
 	buf[1] |= 1 << offset;
@@ -310,7 +300,7 @@ static int cp2112_gpio_direction_output(struct gpio_chip *chip,
 				 HID_REQ_SET_REPORT);
 	if (ret < 0) {
 		hid_err(hdev, "error setting GPIO config: %d\n", ret);
-		goto fail;
+		return ret;
 	}
 
 	/*
@@ -319,13 +309,7 @@ static int cp2112_gpio_direction_output(struct gpio_chip *chip,
 	 */
 	cp2112_gpio_set_unlocked(dev, offset, value);
 
-	mutex_unlock(&dev->lock);
-
 	return 0;
-
-fail:
-	mutex_unlock(&dev->lock);
-	return ret < 0 ? ret : -EIO;
 }
 
 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number,