[11/18] leds: max77650: switch to device_for_each_child_node_scoped()

Commit Message

Javier Carrasco Sept. 26, 2024, 11:21 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().

After switching to the scoped variant, there is no longer need for a
jump to 'err_node_out', as an immediate return is possible.

Signed-off-by: Javier Carrasco <[e-mail]>
---
 drivers/leds/leds-max77650.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

Comments

Bartosz Golaszewski Sept. 27, 2024, 6:36 a.m. UTC | #1

On Fri, Sep 27, 2024 at 1:21 AM Javier Carrasco
<[e-mail]> wrote:
>
> 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_node_out', as an immediate return is possible.
>
> Signed-off-by: Javier Carrasco <[e-mail]>
> ---

Acked-by: Bartosz Golaszewski <[e-mail]>

Patch

diff --git a/drivers/leds/leds-max77650.c b/drivers/leds/leds-max77650.c
index 1eeac56b0014..f8c47078a3bb 100644
--- a/drivers/leds/leds-max77650.c
+++ b/drivers/leds/leds-max77650.c
@@ -62,7 +62,6 @@  static int max77650_led_brightness_set(struct led_classdev *cdev,
 
 static int max77650_led_probe(struct platform_device *pdev)
 {
-	struct fwnode_handle *child;
 	struct max77650_led *leds, *led;
 	struct device *dev;
 	struct regmap *map;
@@ -84,14 +83,12 @@  static int max77650_led_probe(struct platform_device *pdev)
 	if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS)
 		return -ENODEV;
 
-	device_for_each_child_node(dev, child) {
+	device_for_each_child_node_scoped(dev, child) {
 		struct led_init_data init_data = {};
 
 		rv = fwnode_property_read_u32(child, "reg", &reg);
-		if (rv || reg >= MAX77650_LED_NUM_LEDS) {
-			rv = -EINVAL;
-			goto err_node_put;
-		}
+		if (rv || reg >= MAX77650_LED_NUM_LEDS)
+			return -EINVAL;
 
 		led = &leds[reg];
 		led->map = map;
@@ -108,23 +105,20 @@  static int max77650_led_probe(struct platform_device *pdev)
 		rv = devm_led_classdev_register_ext(dev, &led->cdev,
 						    &init_data);
 		if (rv)
-			goto err_node_put;
+			return rv;
 
 		rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
 		if (rv)
-			goto err_node_put;
+			return rv;
 
 		rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT);
 		if (rv)
-			goto err_node_put;
+			return rv;
 	}
 
 	return regmap_write(map,
 			    MAX77650_REG_CNFG_LED_TOP,
 			    MAX77650_LED_TOP_DEFAULT);
-err_node_put:
-	fwnode_handle_put(child);
-	return rv;
 }
 
 static const struct of_device_id max77650_led_of_match[] = {