linux-kernel - [PATCH 3/3] gpio: acpi: switch to device_for_each_child_node

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Message-Id: <20240928-gpio_device_for_each_child_node_scoped-v1-3-c20eff315f4f@gmail.com>
Date: Sat, 28 Sep 2024 21:47:37 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Hoan Tran <hoan@...amperecomputing.com>, 
 Serge Semin <fancer.lancer@...il.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Mika Westerberg <mika.westerberg@...ux.intel.com>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-acpi@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH 3/3] gpio: acpi: 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 a call to fwnode_handle_put() in the error path.

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 <javier.carrasco.cruz@...il.com>
---
 drivers/gpio/gpiolib-acpi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 78ecd56123a3..1f9fe50bba00 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -1315,9 +1315,8 @@ acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
 {
 	struct gpio_chip *chip = achip->chip;
-	struct fwnode_handle *fwnode;
 
-	device_for_each_child_node(chip->parent, fwnode) {
+	device_for_each_child_node_scoped(chip->parent, fwnode) {
 		unsigned long lflags;
 		enum gpiod_flags dflags;
 		struct gpio_desc *desc;
@@ -1335,7 +1334,6 @@ static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
 		ret = gpiod_hog(desc, name, lflags, dflags);
 		if (ret) {
 			dev_err(chip->parent, "Failed to hog GPIO\n");
-			fwnode_handle_put(fwnode);
 			return;
 		}
 	}

-- 
2.43.0