linux-kernel - [PATCH 06/18] leds: el15203000: switch to device_for_each_child_node

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Message-Id: <20240927-leds_device_for_each_child_node_scoped-v1-6-95c0614b38c8@gmail.com>
Date: Fri, 27 Sep 2024 01:20:57 +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 06/18] leds: el15203000: 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-el15203000.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/leds/leds-el15203000.c b/drivers/leds/leds-el15203000.c
index d40194a3029f..e26d1654bd0d 100644
--- a/drivers/leds/leds-el15203000.c
+++ b/drivers/leds/leds-el15203000.c
@@ -237,22 +237,20 @@ static int el15203000_pattern_clear(struct led_classdev *ldev)
 static int el15203000_probe_dt(struct el15203000 *priv)
 {
 	struct el15203000_led	*led = priv->leds;
-	struct fwnode_handle	*child;
 	int			ret;
 
-	device_for_each_child_node(priv->dev, child) {
+	device_for_each_child_node_scoped(priv->dev, child) {
 		struct led_init_data init_data = {};
 
 		ret = fwnode_property_read_u32(child, "reg", &led->reg);
 		if (ret) {
 			dev_err(priv->dev, "LED without ID number");
-			goto err_child_out;
+			return ret;
 		}
 
 		if (led->reg > U8_MAX) {
 			dev_err(priv->dev, "LED value %d is invalid", led->reg);
-			ret = -EINVAL;
-			goto err_child_out;
+			return -EINVAL;
 		}
 
 		led->priv			  = priv;
@@ -274,17 +272,13 @@ static int el15203000_probe_dt(struct el15203000 *priv)
 			dev_err(priv->dev,
 				"failed to register LED device %s, err %d",
 				led->ldev.name, ret);
-			goto err_child_out;
+			return ret;
 		}
 
 		led++;
 	}
 
 	return 0;
-
-err_child_out:
-	fwnode_handle_put(child);
-	return ret;
 }
 
 static int el15203000_probe(struct spi_device *spi)

-- 
2.43.0