linux-kernel - [PATCH] cpuidle: qcom_spm: Fix missing put_device() call in spm_cpuidle

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Message-Id: <20211230114203.13467-1-linmq006@gmail.com>
Date:   Thu, 30 Dec 2021 11:42:03 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linmq006@...il.com, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] cpuidle: qcom_spm: Fix missing put_device() call in spm_cpuidle_register

The reference taken by 'of_find_device_by_node()' must be released when
not needed anymore.
Add the corresponding 'put_device()' in the error handling paths.

Fixes: 60f3692 ("cpuidle: qcom_spm: Detach state machine from main SPM handling")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/cpuidle/cpuidle-qcom-spm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-qcom-spm.c b/drivers/cpuidle/cpuidle-qcom-spm.c
index 01e77913a414..6638c1de90c3 100644
--- a/drivers/cpuidle/cpuidle-qcom-spm.c
+++ b/drivers/cpuidle/cpuidle-qcom-spm.c
@@ -107,12 +107,16 @@ static int spm_cpuidle_register(struct device *cpuidle_dev, int cpu)
 		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);
-	if (!data->spm)
+	if (!data->spm) {
+		put_device(&pdev->dev);
 		return -EINVAL;
+	}
 
 	data->cpuidle_driver = qcom_spm_idle_driver;
 	data->cpuidle_driver.cpumask = (struct cpumask *)cpumask_of(cpu);
-- 
2.17.1