linux-kernel - [PATCH 07/18] leds: gpio: switch to device_for_each_child_node

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Message-Id: <20240927-leds_device_for_each_child_node_scoped-v1-7-95c0614b38c8@gmail.com>
Date: Fri, 27 Sep 2024 01:20:58 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Gene Chen <gene_chen@...htek.com>, 
 Jacek Anaszewski <jacek.anaszewski@...il.com>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Chen-Yu Tsai <wens@...e.org>, 
 Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 linux-sunxi@...ts.linux.dev, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH 07/18] leds: gpio: switch to
 device_for_each_child_node_scoped()

Switch to device_for_each_child_node_scoped() to simplify the code by
removing the need for calls to fwnode_handle_put() in the error paths.

This also prevents possible memory leaks if new error paths are added
without the required call to fwnode_handle_put().

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/leds/leds-gpio.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 4d1612d557c8..7d4488191241 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -148,7 +148,6 @@ struct gpio_leds_priv {
 
 static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
 {
-	struct fwnode_handle *child;
 	struct gpio_leds_priv *priv;
 	int count, used, ret;
 
@@ -162,7 +161,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
 	priv->num_leds = count;
 	used = 0;
 
-	device_for_each_child_node(dev, child) {
+	device_for_each_child_node_scoped(dev, child) {
 		struct gpio_led_data *led_dat = &priv->leds[used];
 		struct gpio_led led = {};
 
@@ -176,7 +175,6 @@ static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
 		if (IS_ERR(led.gpiod)) {
 			dev_err_probe(dev, PTR_ERR(led.gpiod), "Failed to get GPIO '%pfw'\n",
 				      child);
-			fwnode_handle_put(child);
 			return ERR_CAST(led.gpiod);
 		}
 
@@ -192,10 +190,9 @@ static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
 			led.panic_indicator = 1;
 
 		ret = create_gpio_led(&led, led_dat, dev, child, NULL);
-		if (ret < 0) {
-			fwnode_handle_put(child);
+		if (ret < 0)
 			return ERR_PTR(ret);
-		}
+
 		/* Set gpiod label to match the corresponding LED name. */
 		gpiod_set_consumer_name(led_dat->gpiod,
 					led_dat->cdev.dev->kobj.name);

-- 
2.43.0