pinctrl: aw9523: Simplify locking with guard()

Simplify error handling (less gotos) over locks with guard() which also
removes possibility (at least by reading the code) of returning
uninitialized rc/ret value in aw9523_pconf_set() and
aw9523_gpio_get_multiple() functions.

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

Author: krzk

drivers/pinctrl/pinctrl-aw9523.c

@@ -291,14 +291,14 @@ static int aw9523_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 	unsigned int mask, val;
 	int i, rc;
 
-	mutex_lock(&awi->i2c_lock);
+	guard(mutex)(&awi->i2c_lock);
 	for (i = 0; i < num_configs; i++) {
 		param = pinconf_to_config_param(configs[i]);
 		arg = pinconf_to_config_argument(configs[i]);
 
 		rc = aw9523_pcfg_param_to_reg(param, pin, &reg);
 		if (rc)
-			goto end;
+			return rc;
 
 		switch (param) {
 		case PIN_CONFIG_LEVEL:
@@ -307,7 +307,7 @@ static int aw9523_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 						AW9523_REG_CONF_STATE(pin),
 						BIT(regbit), 0);
 			if (rc)
-				goto end;
+				return rc;
 
 			/* Then, fall through to config output level */
 			fallthrough;
@@ -323,10 +323,9 @@ static int aw9523_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 			break;
 		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 			/* Open-Drain is supported only on port 0 */
-			if (pin >= AW9523_PINS_PER_PORT) {
-				rc = -ENOTSUPP;
-				goto end;
-			}
+			if (pin >= AW9523_PINS_PER_PORT)
+				return -ENOTSUPP;
+
 			mask = AW9523_GCR_GPOMD_MASK;
 			val = 0;
 			break;
@@ -341,17 +340,15 @@ static int aw9523_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 			val = AW9523_GCR_GPOMD_MASK;
 			break;
 		default:
-			rc = -ENOTSUPP;
-			goto end;
+			return -ENOTSUPP;
 		}
 
 		rc = regmap_update_bits(awi->regmap, reg, mask, val);
 		if (rc)
-			goto end;
+			return rc;
 	}
-end:
-	mutex_unlock(&awi->i2c_lock);
-	return rc;
+
+	return 0;
 }
 
 static const struct pinconf_ops aw9523_pinconf_ops = {
@@ -599,14 +596,14 @@ static int aw9523_gpio_get_multiple(struct gpio_chip *chip,
 	u8 m, state = 0;
 	int ret;
 
-	mutex_lock(&awi->i2c_lock);
+	guard(mutex)(&awi->i2c_lock);
 
 	/* Port 0 (gpio 0-7) */
 	m = *mask;
 	if (m) {
 		ret = _aw9523_gpio_get_multiple(awi, 0, &state, m);
 		if (ret)
-			goto out;
+			return ret;
 	}
 	*bits = state;
 
@@ -616,13 +613,12 @@ static int aw9523_gpio_get_multiple(struct gpio_chip *chip,
 		ret = _aw9523_gpio_get_multiple(awi, AW9523_PINS_PER_PORT,
 						&state, m);
 		if (ret)
-			goto out;
+			return ret;
 
 		*bits |= (state << 8);
 	}
-out:
-	mutex_unlock(&awi->i2c_lock);
-	return ret;
+
+	return 0;
 }
 
 static int aw9523_gpio_set_multiple(struct gpio_chip *chip,
@@ -632,30 +628,28 @@ static int aw9523_gpio_set_multiple(struct gpio_chip *chip,
 	struct aw9523 *awi = gpiochip_get_data(chip);
 	u8 mask_lo, mask_hi, bits_lo, bits_hi;
 	unsigned int reg;
-	int ret = 0;
+	int ret;
 
 	mask_lo = *mask;
 	mask_hi = *mask >> 8;
 	bits_lo = *bits;
 	bits_hi = *bits >> 8;
 
-	mutex_lock(&awi->i2c_lock);
+	guard(mutex)(&awi->i2c_lock);
 	if (mask_hi) {
 		reg = AW9523_REG_OUT_STATE(AW9523_PINS_PER_PORT);
 		ret = regmap_write_bits(awi->regmap, reg, mask_hi, bits_hi);
 		if (ret)
-			goto out;
+			return ret;
 	}
 	if (mask_lo) {
 		reg = AW9523_REG_OUT_STATE(0);
 		ret = regmap_write_bits(awi->regmap, reg, mask_lo, bits_lo);
 		if (ret)
-			goto out;
+			return ret;
 	}
 
-out:
-	mutex_unlock(&awi->i2c_lock);
-	return ret;
+	return 0;
 }
 
 static int aw9523_gpio_set(struct gpio_chip *chip, unsigned int offset,
@@ -695,16 +689,15 @@ static int aw9523_direction_output(struct gpio_chip *chip,
 	u8 regbit = offset % AW9523_PINS_PER_PORT;
 	int ret;
 
-	mutex_lock(&awi->i2c_lock);
+	guard(mutex)(&awi->i2c_lock);
 	ret = regmap_update_bits(awi->regmap, AW9523_REG_OUT_STATE(offset),
 				 BIT(regbit), value ? BIT(regbit) : 0);
 	if (ret)
-		goto end;
+		return ret;
 
 	ret = regmap_update_bits(awi->regmap, AW9523_REG_CONF_STATE(offset),
 				 BIT(regbit), 0);
-end:
-	mutex_unlock(&awi->i2c_lock);
+
 	return ret;
 }