linux-kernel - [PATCH 14/18] leds: pwm: switch to device_for_each_child_node

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Message-Id: <20240927-leds_device_for_each_child_node_scoped-v1-14-95c0614b38c8@gmail.com>
Date: Fri, 27 Sep 2024 01:21:05 +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 14/18] leds: pwm: 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().

After switching to the scoped variant, there is no longer need for a
jump to 'err_child_out', as an immediate return is possible.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/leds/leds-pwm.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
index e1b414b40353..7961dca0db2f 100644
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c
@@ -140,21 +140,18 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
 
 static int led_pwm_create_fwnode(struct device *dev, struct led_pwm_priv *priv)
 {
-	struct fwnode_handle *fwnode;
 	struct led_pwm led;
 	int ret;
 
-	device_for_each_child_node(dev, fwnode) {
+	device_for_each_child_node_scoped(dev, fwnode) {
 		memset(&led, 0, sizeof(led));
 
 		ret = fwnode_property_read_string(fwnode, "label", &led.name);
 		if (ret && is_of_node(fwnode))
 			led.name = to_of_node(fwnode)->name;
 
-		if (!led.name) {
-			ret = -EINVAL;
-			goto err_child_out;
-		}
+		if (!led.name)
+			return -EINVAL;
 
 		led.active_low = fwnode_property_read_bool(fwnode,
 							   "active-low");
@@ -165,14 +162,10 @@ static int led_pwm_create_fwnode(struct device *dev, struct led_pwm_priv *priv)
 
 		ret = led_pwm_add(dev, priv, &led, fwnode);
 		if (ret)
-			goto err_child_out;
+			return ret;
 	}
 
 	return 0;
-
-err_child_out:
-	fwnode_handle_put(fwnode);
-	return ret;
 }
 
 static int led_pwm_probe(struct platform_device *pdev)

-- 
2.43.0