linux-kernel - [PATCH v2] soc: atmel: fix device_node release in atmel_soc_device

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Message-Id: <20241031-soc-atmel-soc-cleanup-v2-1-73f2d235fd98@gmail.com>
Date: Thu, 31 Oct 2024 13:33:36 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Sudeep Holla <sudeep.holla@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH v2] soc: atmel: fix device_node release in
 atmel_soc_device_init()

A device_node acquired via of_find_node_by_path() requires explicit
calls to of_node_put() when it is no longer needed to avoid leaking the
resource.

Instead of adding the missing calls to of_node_put() in all execution
paths, use the cleanup attribute for 'np' by means of the __free()
macro, which automatically calls of_node_put() when the variable goes
out of scope.

Fixes: 960ddf70cc11 ("drivers: soc: atmel: Avoid calling at91_soc_init on non AT91 SoCs")
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/20241030-soc-atmel-soc-cleanup-v1-0-32b9e0773b14@gmail.com
---
 drivers/soc/atmel/soc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/atmel/soc.c b/drivers/soc/atmel/soc.c
index 2a42b28931c9..298b542dd1c0 100644
--- a/drivers/soc/atmel/soc.c
+++ b/drivers/soc/atmel/soc.c
@@ -399,7 +399,7 @@ static const struct of_device_id at91_soc_allowed_list[] __initconst = {
 
 static int __init atmel_soc_device_init(void)
 {
-	struct device_node *np = of_find_node_by_path("/");
+	struct device_node *np __free(device_node) = of_find_node_by_path("/");
 
 	if (!of_match_node(at91_soc_allowed_list, np))
 		return 0;

---
base-commit: 86e3904dcdc7e70e3257fc1de294a1b75f3d8d04
change-id: 20241030-soc-atmel-soc-cleanup-8fcf3029bb28

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