linux-kernel - [PATCH 1/3] gpio: dwapb: switch to device_for_each_child_node

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Message-Id: <20240928-gpio_device_for_each_child_node_scoped-v1-1-c20eff315f4f@gmail.com>
Date: Sat, 28 Sep 2024 21:47:35 +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 1/3] gpio: dwapb: 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/gpio-dwapb.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 798235791f70..bd374fc27174 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -571,7 +571,6 @@ static void dwapb_get_irq(struct device *dev, struct fwnode_handle *fwnode,
 
 static struct dwapb_platform_data *dwapb_gpio_get_pdata(struct device *dev)
 {
-	struct fwnode_handle *fwnode;
 	struct dwapb_platform_data *pdata;
 	struct dwapb_port_property *pp;
 	int nports;
@@ -592,7 +591,7 @@ static struct dwapb_platform_data *dwapb_gpio_get_pdata(struct device *dev)
 	pdata->nports = nports;
 
 	i = 0;
-	device_for_each_child_node(dev, fwnode)  {
+	device_for_each_child_node_scoped(dev, fwnode)  {
 		pp = &pdata->properties[i++];
 		pp->fwnode = fwnode;
 
@@ -600,7 +599,6 @@ static struct dwapb_platform_data *dwapb_gpio_get_pdata(struct device *dev)
 		    pp->idx >= DWAPB_MAX_PORTS) {
 			dev_err(dev,
 				"missing/invalid port index for port%d\n", i);
-			fwnode_handle_put(fwnode);
 			return ERR_PTR(-EINVAL);
 		}
 

-- 
2.43.0