linux-kernel - [PATCH -next] pwm: img: Fix PM reference leak in img_pwm

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Message-ID: <1620791837-16138-1-git-send-email-zou_wei@huawei.com>
Date:   Wed, 12 May 2021 11:57:17 +0800
From:   Zou Wei <zou_wei@...wei.com>
To:     <thierry.reding@...il.com>, <u.kleine-koenig@...gutronix.de>,
        <lee.jones@...aro.org>
CC:     <linux-pwm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Zou Wei <zou_wei@...wei.com>
Subject: [PATCH -next] pwm: img: Fix PM reference leak in img_pwm_enable()

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zou Wei <zou_wei@...wei.com>
---
 drivers/pwm/pwm-img.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c
index cc37054..11b16ec 100644
--- a/drivers/pwm/pwm-img.c
+++ b/drivers/pwm/pwm-img.c
@@ -156,7 +156,7 @@ static int img_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	struct img_pwm_chip *pwm_chip = to_img_pwm_chip(chip);
 	int ret;
 
-	ret = pm_runtime_get_sync(chip->dev);
+	ret = pm_runtime_resume_and_get(chip->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.6.2