linux-kernel - [PATCH v2] leds: max5970: fix unreleased fwnode

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Message-Id: <20241031-max5970-of_node_put-v2-1-0ffe1f1d3bc9@gmail.com>
Date: Thu, 31 Oct 2024 17:30:30 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>, 
 Patrick Rudolph <patrick.rudolph@...ements.com>, 
 Naresh Solanki <Naresh.Solanki@...ements.com>
Cc: linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH v2] leds: max5970: fix unreleased fwnode_handle in probe
 function

An object initialized via device_get_named_child_node() requires calls
to fwnode_handle_put() when it is no longer required to avoid leaking
memory.

Add the automatic cleanup facility for 'led_node' to ensure that
fwnode_handle_put() is called in all execution paths.

Fixes: 736214b4b02a ("leds: max5970: Add support for max5970")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
Changes in v2:
- Squash patches for mainline solution without intermediate steps.
- Link to v1: https://lore.kernel.org/r/20241019-max5970-of_node_put-v1-0-e6ce4af4119b@gmail.com
---
 drivers/leds/leds-max5970.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/leds-max5970.c b/drivers/leds/leds-max5970.c
index 56a584311581..285074c53b23 100644
--- a/drivers/leds/leds-max5970.c
+++ b/drivers/leds/leds-max5970.c
@@ -45,7 +45,7 @@ static int max5970_led_set_brightness(struct led_classdev *cdev,
 
 static int max5970_led_probe(struct platform_device *pdev)
 {
-	struct fwnode_handle *led_node, *child;
+	struct fwnode_handle *child;
 	struct device *dev = &pdev->dev;
 	struct regmap *regmap;
 	struct max5970_led *ddata;
@@ -55,7 +55,8 @@ static int max5970_led_probe(struct platform_device *pdev)
 	if (!regmap)
 		return -ENODEV;
 
-	led_node = device_get_named_child_node(dev->parent, "leds");
+	struct fwnode_handle *led_node __free(fwnode_handle) =
+		device_get_named_child_node(dev->parent, "leds");
 	if (!led_node)
 		return -ENODEV;
 

---
base-commit: f9f24ca362a4d84dd8aeb4b8f3ec28cb6c43dd06
change-id: 20241019-max5970-of_node_put-939b004f57d2

Best regards,
-- 
Javier Carrasco <javier.carrasco.cruz@...il.com>