[07/18] leds: gpio: switch to device_for_each_child_node_scoped()

Commit Message

Javier Carrasco Sept. 26, 2024, 11:20 p.m. UTC

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().

Signed-off-by: Javier Carrasco <[e-mail]>
---
 drivers/leds/leds-gpio.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

Comments

Andy Shevchenko Nov. 23, 2024, 7:35 p.m. UTC | #1

Fri, Sep 27, 2024 at 01:20:58AM +0200, Javier Carrasco kirjoitti:
> 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().

...

>  		if (IS_ERR(led.gpiod)) {
>  			dev_err_probe(dev, PTR_ERR(led.gpiod), "Failed to get GPIO '%pfw'\n",
>  				      child);
> -			fwnode_handle_put(child);
>  			return ERR_CAST(led.gpiod);

Here you may use dev_err_ptr_probe()

>  		}

Patch

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 4d1612d557c8..7d4488191241 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -148,7 +148,6 @@  struct gpio_leds_priv {
 
 static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
 {
-	struct fwnode_handle *child;
 	struct gpio_leds_priv *priv;
 	int count, used, ret;
 
@@ -162,7 +161,7 @@  static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
 	priv->num_leds = count;
 	used = 0;
 
-	device_for_each_child_node(dev, child) {
+	device_for_each_child_node_scoped(dev, child) {
 		struct gpio_led_data *led_dat = &priv->leds[used];
 		struct gpio_led led = {};
 
@@ -176,7 +175,6 @@  static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
 		if (IS_ERR(led.gpiod)) {
 			dev_err_probe(dev, PTR_ERR(led.gpiod), "Failed to get GPIO '%pfw'\n",
 				      child);
-			fwnode_handle_put(child);
 			return ERR_CAST(led.gpiod);
 		}
 
@@ -192,10 +190,9 @@  static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
 			led.panic_indicator = 1;
 
 		ret = create_gpio_led(&led, led_dat, dev, child, NULL);
-		if (ret < 0) {
-			fwnode_handle_put(child);
+		if (ret < 0)
 			return ERR_PTR(ret);
-		}
+
 		/* Set gpiod label to match the corresponding LED name. */
 		gpiod_set_consumer_name(led_dat->gpiod,
 					led_dat->cdev.dev->kobj.name);