pinctrl: tb10x: Simplify locking with guard()

Simplify error handling (less code in error case) over locks with
guard().

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

Author: krzk

drivers/pinctrl/pinctrl-tb10x.c

@@ -607,7 +607,7 @@ static int tb10x_gpio_request_enable(struct pinctrl_dev *pctl,
 	int muxmode = -1;
 	int i;
 
-	mutex_lock(&state->mutex);
+	guard(mutex)(&state->mutex);
 
 	/*
 	 * Figure out to which port the requested GPIO belongs and how to
@@ -642,7 +642,6 @@ static int tb10x_gpio_request_enable(struct pinctrl_dev *pctl,
 					 * Error: The requested pin is already
 					 * used for something else.
 					 */
-					mutex_unlock(&state->mutex);
 					return -EBUSY;
 				}
 				break;
@@ -667,8 +666,6 @@ static int tb10x_gpio_request_enable(struct pinctrl_dev *pctl,
 	if (muxport >= 0)
 		tb10x_pinctrl_set_config(state, muxport, muxmode);
 
-	mutex_unlock(&state->mutex);
-
 	return 0;
 }
 
@@ -695,34 +692,28 @@ static int tb10x_pctl_set_mux(struct pinctrl_dev *pctl,
 	if (grp->port < 0)
 		return 0;
 
-	mutex_lock(&state->mutex);
+	guard(mutex)(&state->mutex);
 
 	/*
 	 * Check if the requested function is compatible with previously
 	 * requested functions.
 	 */
 	if (state->ports[grp->port].count
-			&& (state->ports[grp->port].mode != grp->mode)) {
-		mutex_unlock(&state->mutex);
+			&& (state->ports[grp->port].mode != grp->mode))
 		return -EBUSY;
-	}
 
 	/*
 	 * Check if the requested function is compatible with previously
 	 * requested GPIOs.
 	 */
 	for (i = 0; i < grp->pincnt; i++)
-		if (test_bit(grp->pins[i], state->gpios)) {
-			mutex_unlock(&state->mutex);
+		if (test_bit(grp->pins[i], state->gpios))
 			return -EBUSY;
-		}
 
 	tb10x_pinctrl_set_config(state, grp->port, grp->mode);
 
 	state->ports[grp->port].count++;
 
-	mutex_unlock(&state->mutex);
-
 	return 0;
 }