linux-kernel - [PATCH v3] pmdomain: imx: Fix reference count leak in imx_gpc

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Message-Id: <20251210033524.34600-1-vulab@iscas.ac.cn>
Date: Wed, 10 Dec 2025 03:35:24 +0000
From: Wentao Liang <vulab@...as.ac.cn>
To: ulf.hansson@...aro.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com
Cc: linux-pm@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Wentao Liang <vulab@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH v3] pmdomain: imx: Fix reference count leak in imx_gpc_probe()

of_get_child_by_name() returns a node pointer with refcount incremented.
Use the __free() attribute to manage the pgc_node reference, ensuring
automatic of_node_put() cleanup when pgc_node goes out of scope.

This eliminates the need for explicit error handling paths and avoids
reference count leaks.

Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Cc: stable@...r.kernel.org
Signed-off-by: Wentao Liang <vulab@...as.ac.cn>

---
Change in V3:
- Ensure variable is assigned when using cleanup attribute

Change in V2:
- Use __free() attribute instead of explicit of_node_put() calls
---
 drivers/pmdomain/imx/gpc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/pmdomain/imx/gpc.c b/drivers/pmdomain/imx/gpc.c
index f18c7e6e75dd..0fb3250dbf5f 100644
--- a/drivers/pmdomain/imx/gpc.c
+++ b/drivers/pmdomain/imx/gpc.c
@@ -403,13 +403,12 @@ static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap,
 static int imx_gpc_probe(struct platform_device *pdev)
 {
 	const struct imx_gpc_dt_data *of_id_data = device_get_match_data(&pdev->dev);
-	struct device_node *pgc_node;
+	struct device_node *pgc_node __free(pgc_node)
+		= of_get_child_by_name(pdev->dev.of_node, "pgc");
 	struct regmap *regmap;
 	void __iomem *base;
 	int ret;
 
-	pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc");
-
 	/* bail out if DT too old and doesn't provide the necessary info */
 	if (!of_property_present(pdev->dev.of_node, "#power-domain-cells") &&
 	    !pgc_node)
-- 
2.34.1