linux-kernel - [PATCH][next] drivers: video: Simplify device_node cleanup using _

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Message-ID: <20240418194302.1466-1-shresthprasad7@gmail.com>
Date: Fri, 19 Apr 2024 01:13:02 +0530
From: Shresth Prasad <shresthprasad7@...il.com>
To: lee@...nel.org,
	daniel.thompson@...aro.org,
	jingoohan1@...il.com,
	deller@....de
Cc: dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	javier.carrasco.cruz@...il.com,
	Shresth Prasad <shresthprasad7@...il.com>,
	Julia Lawall <julia.lawall@...ia.fr>
Subject: [PATCH][next] drivers: video: Simplify device_node cleanup using __free

Add `__free` function attribute to `np` device_node pointer
initialisation and remove of_node_put cleanup for this pointer.

The `__free` attribute is used for scope based cleanup instead of
manually freeing the resource using `of_node_put`, making cleanup
simpler and safer.

Suggested-by: Julia Lawall <julia.lawall@...ia.fr>
Signed-off-by: Shresth Prasad <shresthprasad7@...il.com>
---
 drivers/video/backlight/sky81452-backlight.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
index eb18c6eb0ff0..3c5d8125080c 100644
--- a/drivers/video/backlight/sky81452-backlight.c
+++ b/drivers/video/backlight/sky81452-backlight.c
@@ -182,7 +182,7 @@ static const struct attribute_group sky81452_bl_attr_group = {
 static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
 							struct device *dev)
 {
-	struct device_node *np = of_node_get(dev->of_node);
+	struct device_node *np __free(device_node) = of_node_get(dev->of_node);
 	struct sky81452_bl_platform_data *pdata;
 	int num_entry;
 	unsigned int sources[6];
@@ -194,10 +194,8 @@ static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
 	}
 
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
-	if (!pdata) {
-		of_node_put(np);
+	if (!pdata)
 		return ERR_PTR(-ENOMEM);
-	}
 
 	of_property_read_string(np, "name", &pdata->name);
 	pdata->ignore_pwm = of_property_read_bool(np, "skyworks,ignore-pwm");
@@ -217,7 +215,6 @@ static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
 					num_entry);
 		if (ret < 0) {
 			dev_err(dev, "led-sources node is invalid.\n");
-			of_node_put(np);
 			return ERR_PTR(-EINVAL);
 		}
 
@@ -237,7 +234,6 @@ static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
 	if (ret < 0)
 		pdata->boost_current_limit = 2750;
 
-	of_node_put(np);
 	return pdata;
 }
 #else
-- 
2.44.0