leds: leds-lp55xx: Convert mutex lock/unlock to guard API

Convert any entry of mutex lock/unlock to guard API and simplify code.
With the use of guard API, handling for selttest functions can be
greatly simplified.

Suggested-by: Markus Elfring <[email protected]>
Signed-off-by: Christian Marangi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: Ansuel

drivers/leds/leds-lp5521.c

@@ -9,6 +9,7 @@
  *          Milo(Woogyom) Kim <[email protected]>
  */
 
+#include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/firmware.h>
 #include <linux/i2c.h>
@@ -185,9 +186,9 @@ static ssize_t lp5521_selftest(struct device *dev,
 	struct lp55xx_chip *chip = led->chip;
 	int ret;
 
-	mutex_lock(&chip->lock);
+	guard(mutex)(&chip->lock);
+
 	ret = lp5521_run_selftest(chip, buf);
-	mutex_unlock(&chip->lock);
 
 	return sysfs_emit(buf, "%s\n", ret ? "FAIL" : "OK");
 }

drivers/leds/leds-lp5523.c

@@ -9,6 +9,7 @@
  *          Milo(Woogyom) Kim <[email protected]>
  */
 
+#include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/firmware.h>
 #include <linux/i2c.h>
@@ -188,31 +189,31 @@ static ssize_t lp5523_selftest(struct device *dev,
 	int ret, pos = 0;
 	u8 status, adc, vdd, i;
 
-	mutex_lock(&chip->lock);
+	guard(mutex)(&chip->lock);
 
 	ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 	if (ret < 0)
-		goto fail;
+		return sysfs_emit(buf, "FAIL\n");
 
 	/* Check that ext clock is really in use if requested */
 	if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
 		if  ((status & LP5523_EXT_CLK_USED) == 0)
-			goto fail;
+			return sysfs_emit(buf, "FAIL\n");
 	}
 
 	/* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 	lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
 	usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 	ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 	if (ret < 0)
-		goto fail;
+		return sysfs_emit(buf, "FAIL\n");
 
 	if (!(status & LP5523_LEDTEST_DONE))
 		usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 
 	ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
 	if (ret < 0)
-		goto fail;
+		return sysfs_emit(buf, "FAIL\n");
 
 	vdd--;	/* There may be some fluctuation in measurement */
 
@@ -235,14 +236,14 @@ static ssize_t lp5523_selftest(struct device *dev,
 		usleep_range(3000, 6000);
 		ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 		if (ret < 0)
-			goto fail;
+			return sysfs_emit(buf, "FAIL\n");
 
 		if (!(status & LP5523_LEDTEST_DONE))
 			usleep_range(3000, 6000); /* Was not ready. Wait. */
 
 		ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
 		if (ret < 0)
-			goto fail;
+			return sysfs_emit(buf, "FAIL\n");
 
 		if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 			pos += sysfs_emit_at(buf, pos, "LED %d FAIL\n",
@@ -256,16 +257,8 @@ static ssize_t lp5523_selftest(struct device *dev,
 			     led->led_current);
 		led++;
 	}
-	if (pos == 0)
-		pos = sysfs_emit(buf, "OK\n");
-	goto release_lock;
-fail:
-	pos = sysfs_emit(buf, "FAIL\n");
 
-release_lock:
-	mutex_unlock(&chip->lock);
-
-	return pos;
+	return pos == 0 ? sysfs_emit(buf, "OK\n") : pos;
 }
 
 LP55XX_DEV_ATTR_ENGINE_MODE(1);

drivers/leds/leds-lp5562.c

@@ -7,6 +7,7 @@
  * Author: Milo(Woogyom) Kim <[email protected]>
  */
 
+#include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/firmware.h>
 #include <linux/i2c.h>
@@ -171,9 +172,9 @@ static int lp5562_led_brightness(struct lp55xx_led *led)
 	};
 	int ret;
 
-	mutex_lock(&chip->lock);
+	guard(mutex)(&chip->lock);
+
 	ret = lp55xx_write(chip, addr[led->chan_nr], led->brightness);
-	mutex_unlock(&chip->lock);
 
 	return ret;
 }
@@ -268,9 +269,9 @@ static ssize_t lp5562_store_pattern(struct device *dev,
 	if (mode > num_patterns || !ptn)
 		return -EINVAL;
 
-	mutex_lock(&chip->lock);
+	guard(mutex)(&chip->lock);
+
 	ret = lp5562_run_predef_led_pattern(chip, mode);
-	mutex_unlock(&chip->lock);
 
 	if (ret)
 		return ret;
@@ -320,9 +321,9 @@ static ssize_t lp5562_store_engine_mux(struct device *dev,
 		return -EINVAL;
 	}
 
-	mutex_lock(&chip->lock);
+	guard(mutex)(&chip->lock);
+
 	lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val);
-	mutex_unlock(&chip->lock);
 
 	return len;
 }

drivers/leds/leds-lp5569.c

@@ -4,6 +4,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/firmware.h>
 #include <linux/i2c.h>
@@ -396,17 +397,17 @@ static ssize_t lp5569_selftest(struct device *dev,
 	struct lp55xx_chip *chip = led->chip;
 	int i, pos = 0;
 
-	mutex_lock(&chip->lock);
+	guard(mutex)(&chip->lock);
 
 	/* Test LED Open */
 	pos = lp5569_led_open_test(led, buf);
 	if (pos < 0)
-		goto fail;
+		return sprintf(buf, "FAIL\n");
 
 	/* Test LED Shorted */
 	pos += lp5569_led_short_test(led, buf);
 	if (pos < 0)
-		goto fail;
+		return sprintf(buf, "FAIL\n");
 
 	for (i = 0; i < chip->pdata->num_channels; i++) {
 		/* Restore current */
@@ -419,16 +420,7 @@ static ssize_t lp5569_selftest(struct device *dev,
 		led++;
 	}
 
-	if (pos == 0)
-		pos = sysfs_emit(buf, "OK\n");
-	goto release_lock;
-fail:
-	pos = sysfs_emit(buf, "FAIL\n");
-
-release_lock:
-	mutex_unlock(&chip->lock);
-
-	return pos;
+	return pos == 0 ? sysfs_emit(buf, "OK\n") : pos;
 }
 
 LP55XX_DEV_ATTR_ENGINE_MODE(1);