linux-kernel - [PATCH 09/18] leds: lm3697: switch to device_for_each_child_node

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Message-Id: <20240927-leds_device_for_each_child_node_scoped-v1-9-95c0614b38c8@gmail.com>
Date: Fri, 27 Sep 2024 01:21:00 +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 09/18] leds: lm3697: 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 'child_out', as an immediate return is possible.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/leds/leds-lm3697.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/leds/leds-lm3697.c b/drivers/leds/leds-lm3697.c
index 99de2a331727..7ad232780a31 100644
--- a/drivers/leds/leds-lm3697.c
+++ b/drivers/leds/leds-lm3697.c
@@ -202,7 +202,6 @@ static int lm3697_init(struct lm3697 *priv)
 
 static int lm3697_probe_dt(struct lm3697 *priv)
 {
-	struct fwnode_handle *child = NULL;
 	struct device *dev = priv->dev;
 	struct lm3697_led *led;
 	int ret = -EINVAL;
@@ -220,19 +219,18 @@ static int lm3697_probe_dt(struct lm3697 *priv)
 	if (IS_ERR(priv->regulator))
 		priv->regulator = NULL;
 
-	device_for_each_child_node(dev, child) {
+	device_for_each_child_node_scoped(dev, child) {
 		struct led_init_data init_data = {};
 
 		ret = fwnode_property_read_u32(child, "reg", &control_bank);
 		if (ret) {
 			dev_err(dev, "reg property missing\n");
-			goto child_out;
+			return ret;
 		}
 
 		if (control_bank > LM3697_CONTROL_B) {
 			dev_err(dev, "reg property is invalid\n");
-			ret = -EINVAL;
-			goto child_out;
+			return -EINVAL;
 		}
 
 		led = &priv->leds[i];
@@ -262,7 +260,7 @@ static int lm3697_probe_dt(struct lm3697 *priv)
 						    led->num_leds);
 		if (ret) {
 			dev_err(dev, "led-sources property missing\n");
-			goto child_out;
+			return ret;
 		}
 
 		for (j = 0; j < led->num_leds; j++)
@@ -286,17 +284,13 @@ static int lm3697_probe_dt(struct lm3697 *priv)
 						     &init_data);
 		if (ret) {
 			dev_err(dev, "led register err: %d\n", ret);
-			goto child_out;
+			return ret;
 		}
 
 		i++;
 	}
 
-	return ret;
-
-child_out:
-	fwnode_handle_put(child);
-	return ret;
+	return 0;
 }
 
 static int lm3697_probe(struct i2c_client *client)

-- 
2.43.0