linux-kernel - [PATCH 1/2] cpuidle: qcom-spm: fix device and OF node leaks at probe

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Message-ID: <20250908152213.30621-2-johan@kernel.org>
Date: Mon,  8 Sep 2025 17:22:12 +0200
From: Johan Hovold <johan@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>,
	linux-arm-msm@...r.kernel.org,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan@...nel.org>
Subject: [PATCH 1/2] cpuidle: qcom-spm: fix device and OF node leaks at probe

Make sure to drop the reference to the saw device taken by
of_find_device_by_node() after retrieving its driver data during
probe().

Also drop the reference to the CPU node sooner to avoid leaking it in
case there is no saw node or device.

Fixes: 60f3692b5f0b ("cpuidle: qcom_spm: Detach state machine from main SPM handling")
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/cpuidle/cpuidle-qcom-spm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-qcom-spm.c b/drivers/cpuidle/cpuidle-qcom-spm.c
index 5f386761b156..f60a4cf53642 100644
--- a/drivers/cpuidle/cpuidle-qcom-spm.c
+++ b/drivers/cpuidle/cpuidle-qcom-spm.c
@@ -96,20 +96,23 @@ static int spm_cpuidle_register(struct device *cpuidle_dev, int cpu)
 		return -ENODEV;
 
 	saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
+	of_node_put(cpu_node);
 	if (!saw_node)
 		return -ENODEV;
 
 	pdev = of_find_device_by_node(saw_node);
 	of_node_put(saw_node);
-	of_node_put(cpu_node);
 	if (!pdev)
 		return -ENODEV;
 
 	data = devm_kzalloc(cpuidle_dev, sizeof(*data), GFP_KERNEL);
-	if (!data)
+	if (!data) {
+		put_device(&pdev->dev);
 		return -ENOMEM;
+	}
 
 	data->spm = dev_get_drvdata(&pdev->dev);
+	put_device(&pdev->dev);
 	if (!data->spm)
 		return -EINVAL;
 
-- 
2.49.1