FAILED: patch "[PATCH] pmdomain: imx: Fix reference count leak in imx_gpc_remove" failed to apply to 6.6-stable tree

FAILED: patch "[PATCH] pmdomain: imx: Fix reference count leak in imx_gpc_remove" failed to apply to 6.6-stable tree

[gregkh]

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x bbde14682eba21d86f5f3d6fe2d371b1f97f1e61
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025112009-appliance-symptom-7a59@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From bbde14682eba21d86f5f3d6fe2d371b1f97f1e61 Mon Sep 17 00:00:00 2001
From: Miaoqian Lin <linmq006@gmail.com>
Date: Tue, 28 Oct 2025 11:16:20 +0800
Subject: [PATCH] pmdomain: imx: Fix reference count leak in imx_gpc_remove

of_get_child_by_name() returns a node pointer with refcount incremented, we
should use of_node_put() on it when not needed anymore. Add the missing
of_node_put() to avoid refcount leak.

Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Cc: stable@vger.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/pmdomain/imx/gpc.c b/drivers/pmdomain/imx/gpc.c
index 33991f3c6b55..a34b260274f7 100644
--- a/drivers/pmdomain/imx/gpc.c
+++ b/drivers/pmdomain/imx/gpc.c
@@ -536,6 +536,8 @@ static void imx_gpc_remove(struct platform_device *pdev)
 			return;
 		}
 	}
+
+	of_node_put(pgc_node);
 }
 
 static struct platform_driver imx_gpc_driver = {

[PATCH 6.6.y 1/2] pmdomain: imx-gpc: Convert to platform remove callback returning void

[Sasha Levin]

From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

[ Upstream commit da07c5871d18157608a0d0702cb093168d79080a ]

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

In the error path emit an error message replacing the (less useful)
message by the core. Apart from the improved error message there is no
change in behaviour.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231124080623.564924-3-u.kleine-koenig@pengutronix.de
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Stable-dep-of: bbde14682eba ("pmdomain: imx: Fix reference count leak in imx_gpc_remove")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pmdomain/imx/gpc.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/pmdomain/imx/gpc.c b/drivers/pmdomain/imx/gpc.c
index 419ed15cc10c4..66703395b1795 100644
--- a/drivers/pmdomain/imx/gpc.c
+++ b/drivers/pmdomain/imx/gpc.c
@@ -512,7 +512,7 @@ static int imx_gpc_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int imx_gpc_remove(struct platform_device *pdev)
+static void imx_gpc_remove(struct platform_device *pdev)
 {
 	struct device_node *pgc_node;
 	int ret;
@@ -522,7 +522,7 @@ static int imx_gpc_remove(struct platform_device *pdev)
 	/* bail out if DT too old and doesn't provide the necessary info */
 	if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells") &&
 	    !pgc_node)
-		return 0;
+		return;
 
 	/*
 	 * If the old DT binding is used the toplevel driver needs to
@@ -532,16 +532,20 @@ static int imx_gpc_remove(struct platform_device *pdev)
 		of_genpd_del_provider(pdev->dev.of_node);
 
 		ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_PU].base);
-		if (ret)
-			return ret;
+		if (ret) {
+			dev_err(&pdev->dev, "Failed to remove PU power domain (%pe)\n",
+				ERR_PTR(ret));
+			return;
+		}
 		imx_pgc_put_clocks(&imx_gpc_domains[GPC_PGC_DOMAIN_PU]);
 
 		ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_ARM].base);
-		if (ret)
-			return ret;
+		if (ret) {
+			dev_err(&pdev->dev, "Failed to remove ARM power domain (%pe)\n",
+				ERR_PTR(ret));
+			return;
+		}
 	}
-
-	return 0;
 }
 
 static struct platform_driver imx_gpc_driver = {
@@ -550,6 +554,6 @@ static struct platform_driver imx_gpc_driver = {
 		.of_match_table = imx_gpc_dt_ids,
 	},
 	.probe = imx_gpc_probe,
-	.remove = imx_gpc_remove,
+	.remove_new = imx_gpc_remove,
 };
 builtin_platform_driver(imx_gpc_driver)
-- 
2.51.0

[PATCH 6.6.y 2/2] pmdomain: imx: Fix reference count leak in imx_gpc_remove

[Sasha Levin]

From: Miaoqian Lin <linmq006@gmail.com>

[ Upstream commit bbde14682eba21d86f5f3d6fe2d371b1f97f1e61 ]

of_get_child_by_name() returns a node pointer with refcount incremented, we
should use of_node_put() on it when not needed anymore. Add the missing
of_node_put() to avoid refcount leak.

Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Cc: stable@vger.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pmdomain/imx/gpc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pmdomain/imx/gpc.c b/drivers/pmdomain/imx/gpc.c
index 66703395b1795..d7c0301a7121b 100644
--- a/drivers/pmdomain/imx/gpc.c
+++ b/drivers/pmdomain/imx/gpc.c
@@ -546,6 +546,8 @@ static void imx_gpc_remove(struct platform_device *pdev)
 			return;
 		}
 	}
+
+	of_node_put(pgc_node);
 }
 
 static struct platform_driver imx_gpc_driver = {
-- 
2.51.0