linux-kernel - [PATCH 5.10 138/243] pwm: img: Fix PM reference leak in img_pwm

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Date:   Mon, 19 Jul 2021 16:52:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Zou Wei <zou_wei@...wei.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 138/243] pwm: img: Fix PM reference leak in img_pwm_enable()

From: Zou Wei <zou_wei@...wei.com>

[ Upstream commit fde25294dfd8e36e4e30b693c27a86232864002a ]

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>
Signed-off-by: Thierry Reding <thierry.reding@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 a34d95ed70b2..22c002e685b3 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;
 
-- 
2.30.2