linux-kernel - [PATCH V3] leds: sc27xx: Move mutex

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Date:   Fri, 13 Oct 2023 10:20:10 +0800
From:   Chunyan Zhang <chunyan.zhang@...soc.com>
To:     Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>
CC:     <linux-leds@...r.kernel.org>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH V3] leds: sc27xx: Move mutex_init() down

Move the mutex_init() to avoid redundant mutex_destroy() calls after
that for each time the probe fails.

Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
Rebased onto linux-next.

V3: Move the mutex_init() before sc27xx_led_register(), in case it maybe
used right after led registerd.

V2: Move the mutex_init() to the end of .probe() instead of adding mutex_destroy().
---
 drivers/leds/leds-sc27xx-bltc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/leds-sc27xx-bltc.c b/drivers/leds/leds-sc27xx-bltc.c
index af1f00a2f328..f04db793e8d6 100644
--- a/drivers/leds/leds-sc27xx-bltc.c
+++ b/drivers/leds/leds-sc27xx-bltc.c
@@ -296,7 +296,6 @@ static int sc27xx_led_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	platform_set_drvdata(pdev, priv);
-	mutex_init(&priv->lock);
 	priv->base = base;
 	priv->regmap = dev_get_regmap(dev->parent, NULL);
 	if (!priv->regmap) {
@@ -309,13 +308,11 @@ static int sc27xx_led_probe(struct platform_device *pdev)
 		err = of_property_read_u32(child, "reg", &reg);
 		if (err) {
 			of_node_put(child);
-			mutex_destroy(&priv->lock);
 			return err;
 		}
 
 		if (reg >= SC27XX_LEDS_MAX || priv->leds[reg].active) {
 			of_node_put(child);
-			mutex_destroy(&priv->lock);
 			return -EINVAL;
 		}
 
@@ -323,6 +320,8 @@ static int sc27xx_led_probe(struct platform_device *pdev)
 		priv->leds[reg].active = true;
 	}
 
+	mutex_init(&priv->lock);
+
 	err = sc27xx_led_register(dev, priv);
 	if (err)
 		mutex_destroy(&priv->lock);
-- 
2.41.0