linux-kernel - [PATCH 13/18] leds: pca963x: switch to device_for_each_child_node

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Message-Id: <20240927-leds_device_for_each_child_node_scoped-v1-13-95c0614b38c8@gmail.com>
Date: Fri, 27 Sep 2024 01:21:04 +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 13/18] leds: pca963x: 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', as an immediate return is possible.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/leds/leds-pca963x.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
index b53905da3592..050e93b04884 100644
--- a/drivers/leds/leds-pca963x.c
+++ b/drivers/leds/leds-pca963x.c
@@ -306,7 +306,6 @@ static int pca963x_register_leds(struct i2c_client *client,
 	struct pca963x_chipdef *chipdef = chip->chipdef;
 	struct pca963x_led *led = chip->leds;
 	struct device *dev = &client->dev;
-	struct fwnode_handle *child;
 	bool hw_blink;
 	s32 mode2;
 	u32 reg;
@@ -338,7 +337,7 @@ static int pca963x_register_leds(struct i2c_client *client,
 	if (ret < 0)
 		return ret;
 
-	device_for_each_child_node(dev, child) {
+	device_for_each_child_node_scoped(dev, child) {
 		struct led_init_data init_data = {};
 		char default_label[32];
 
@@ -346,8 +345,7 @@ static int pca963x_register_leds(struct i2c_client *client,
 		if (ret || reg >= chipdef->n_leds) {
 			dev_err(dev, "Invalid 'reg' property for node %pfw\n",
 				child);
-			ret = -EINVAL;
-			goto err;
+			return -EINVAL;
 		}
 
 		led->led_num = reg;
@@ -369,16 +367,13 @@ static int pca963x_register_leds(struct i2c_client *client,
 		if (ret) {
 			dev_err(dev, "Failed to register LED for node %pfw\n",
 				child);
-			goto err;
+			return ret;
 		}
 
 		++led;
 	}
 
 	return 0;
-err:
-	fwnode_handle_put(child);
-	return ret;
 }
 
 static int pca963x_suspend(struct device *dev)

-- 
2.43.0