linux-kernel - [PATCH 18/18] leds: rgb: mt6370: switch to device_for_each_child_node

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Message-Id: <20240927-leds_device_for_each_child_node_scoped-v1-18-95c0614b38c8@gmail.com>
Date: Fri, 27 Sep 2024 01:21:09 +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 18/18] leds: rgb: mt6370: 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 'fwnode_release', as an immediate return is possible. Given that
the loop is called in the probe function, and it already uses
dev_err_probe(), the common "dev_err() + return" has been updated as
well.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/leds/rgb/leds-mt6370-rgb.c | 37 +++++++++++--------------------------
 1 file changed, 11 insertions(+), 26 deletions(-)

diff --git a/drivers/leds/rgb/leds-mt6370-rgb.c b/drivers/leds/rgb/leds-mt6370-rgb.c
index 359ef00498b4..fe76e8e27f9c 100644
--- a/drivers/leds/rgb/leds-mt6370-rgb.c
+++ b/drivers/leds/rgb/leds-mt6370-rgb.c
@@ -905,7 +905,6 @@ static int mt6370_leds_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct mt6370_priv *priv;
-	struct fwnode_handle *child;
 	size_t count;
 	unsigned int i = 0;
 	int ret;
@@ -936,37 +935,27 @@ static int mt6370_leds_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to allocate regmap field\n");
 
-	device_for_each_child_node(dev, child) {
+	device_for_each_child_node_scoped(dev, child) {
 		struct mt6370_led *led = priv->leds + i++;
 		struct led_init_data init_data = { .fwnode = child };
 		u32 reg, color;
 
 		ret = fwnode_property_read_u32(child, "reg", &reg);
-		if (ret) {
-			dev_err(dev, "Failed to parse reg property\n");
-			goto fwnode_release;
-		}
+		if (ret)
+			dev_err_probe(dev, ret, "Failed to parse reg property\n");
 
-		if (reg >= MT6370_MAX_LEDS) {
-			ret = -EINVAL;
-			dev_err(dev, "Error reg property number\n");
-			goto fwnode_release;
-		}
+		if (reg >= MT6370_MAX_LEDS)
+			return dev_err_probe(dev, -EINVAL, "Error reg property number\n");
 
 		ret = fwnode_property_read_u32(child, "color", &color);
-		if (ret) {
-			dev_err(dev, "Failed to parse color property\n");
-			goto fwnode_release;
-		}
+		if (ret)
+			return dev_err_probe(dev, ret, "Failed to parse color property\n");
 
 		if (color == LED_COLOR_ID_RGB || color == LED_COLOR_ID_MULTI)
 			reg = MT6370_VIRTUAL_MULTICOLOR;
 
-		if (priv->leds_active & BIT(reg)) {
-			ret = -EINVAL;
-			dev_err(dev, "Duplicate reg property\n");
-			goto fwnode_release;
-		}
+		if (priv->leds_active & BIT(reg))
+			return dev_err_probe(dev, -EINVAL, "Duplicate reg property\n");
 
 		priv->leds_active |= BIT(reg);
 
@@ -975,18 +964,14 @@ static int mt6370_leds_probe(struct platform_device *pdev)
 
 		ret = mt6370_init_led_properties(dev, led, &init_data);
 		if (ret)
-			goto fwnode_release;
+			return ret;
 
 		ret = mt6370_led_register(dev, led, &init_data);
 		if (ret)
-			goto fwnode_release;
+			return ret;
 	}
 
 	return 0;
-
-fwnode_release:
-	fwnode_handle_put(child);
-	return ret;
 }
 
 static const struct of_device_id mt6370_rgbled_device_table[] = {

-- 
2.43.0