linux-kernel - [PATCH 08/18] leds: lm3532: switch to device_for_each_child_node

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Message-Id: <20240927-leds_device_for_each_child_node_scoped-v1-8-95c0614b38c8@gmail.com>
Date: Fri, 27 Sep 2024 01:20:59 +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 08/18] leds: lm3532: 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-lm3532.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/leds/leds-lm3532.c b/drivers/leds/leds-lm3532.c
index 54b5650877f7..24dc8ad27bb3 100644
--- a/drivers/leds/leds-lm3532.c
+++ b/drivers/leds/leds-lm3532.c
@@ -551,7 +551,6 @@ static void gpio_set_low_action(void *data)
 
 static int lm3532_parse_node(struct lm3532_data *priv)
 {
-	struct fwnode_handle *child = NULL;
 	struct lm3532_led *led;
 	int control_bank;
 	u32 ramp_time;
@@ -587,7 +586,7 @@ static int lm3532_parse_node(struct lm3532_data *priv)
 	else
 		priv->runtime_ramp_down = lm3532_get_ramp_index(ramp_time);
 
-	device_for_each_child_node(priv->dev, child) {
+	device_for_each_child_node_scoped(priv->dev, child) {
 		struct led_init_data idata = {
 			.fwnode = child,
 			.default_label = ":",
@@ -599,7 +598,7 @@ static int lm3532_parse_node(struct lm3532_data *priv)
 		ret = fwnode_property_read_u32(child, "reg", &control_bank);
 		if (ret) {
 			dev_err(&priv->client->dev, "reg property missing\n");
-			goto child_out;
+			return ret;
 		}
 
 		if (control_bank > LM3532_CONTROL_C) {
@@ -613,7 +612,7 @@ static int lm3532_parse_node(struct lm3532_data *priv)
 					       &led->mode);
 		if (ret) {
 			dev_err(&priv->client->dev, "ti,led-mode property missing\n");
-			goto child_out;
+			return ret;
 		}
 
 		if (fwnode_property_present(child, "led-max-microamp") &&
@@ -647,7 +646,7 @@ static int lm3532_parse_node(struct lm3532_data *priv)
 						    led->num_leds);
 		if (ret) {
 			dev_err(&priv->client->dev, "led-sources property missing\n");
-			goto child_out;
+			return ret;
 		}
 
 		led->priv = priv;
@@ -657,23 +656,20 @@ static int lm3532_parse_node(struct lm3532_data *priv)
 		if (ret) {
 			dev_err(&priv->client->dev, "led register err: %d\n",
 				ret);
-			goto child_out;
+			return ret;
 		}
 
 		ret = lm3532_init_registers(led);
 		if (ret) {
 			dev_err(&priv->client->dev, "register init err: %d\n",
 				ret);
-			goto child_out;
+			return ret;
 		}
 
 		i++;
 	}
-	return 0;
 
-child_out:
-	fwnode_handle_put(child);
-	return ret;
+	return 0;
 }
 
 static int lm3532_probe(struct i2c_client *client)

-- 
2.43.0