linux-kernel - [PATCH v2] clk: renesas: cpg-mssr: fix 'soc' node handling in cpg_mssr_reserved

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Message-Id: <20241031-clk-renesas-cpg-mssr-cleanup-v2-1-0010936d1154@gmail.com>
Date: Thu, 31 Oct 2024 13:43:16 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc: linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH v2] clk: renesas: cpg-mssr: fix 'soc' node handling in
 cpg_mssr_reserved_init()

A device_node reference obtained via of_find_node_by_path() requires
explicit calls to of_node_put() after it is no longer required to avoid
leaking the resource.

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

Fixes: 6aa175476490 ("clk: renesas: cpg-mssr: Ignore all clocks assigned to non-Linux system")
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/20241031-clk-renesas-cpg-mssr-cleanup-v1-0-628274ecbfcb@gmail.com
---
 drivers/clk/renesas/renesas-cpg-mssr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index 79e7a90c3b1b..bf85501709f0 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -979,7 +979,7 @@ static void __init cpg_mssr_reserved_exit(struct cpg_mssr_priv *priv)
 static int __init cpg_mssr_reserved_init(struct cpg_mssr_priv *priv,
 					 const struct cpg_mssr_info *info)
 {
-	struct device_node *soc = of_find_node_by_path("/soc");
+	struct device_node *soc __free(device_node) = of_find_node_by_path("/soc");
 	struct device_node *node;
 	uint32_t args[MAX_PHANDLE_ARGS];
 	unsigned int *ids = NULL;

---
base-commit: 86e3904dcdc7e70e3257fc1de294a1b75f3d8d04
change-id: 20241031-clk-renesas-cpg-mssr-cleanup-1933df63bc9c

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