linux-kernel - [PATCH] media: fimc-capture: Fix runtime PM imbalance on error

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Message-Id: <20200521102205.16604-1-dinghao.liu@zju.edu.cn>
Date:   Thu, 21 May 2020 18:22:04 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Kyungmin Park <kyungmin.park@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: fimc-capture: Fix runtime PM imbalance on error

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code. Thus a pairing decrement is needed on
the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/media/platform/exynos4-is/fimc-capture.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/exynos4-is/fimc-capture.c b/drivers/media/platform/exynos4-is/fimc-capture.c
index 705f182330ca..dd33b888971f 100644
--- a/drivers/media/platform/exynos4-is/fimc-capture.c
+++ b/drivers/media/platform/exynos4-is/fimc-capture.c
@@ -478,8 +478,10 @@ static int fimc_capture_open(struct file *file)
 
 	set_bit(ST_CAPT_BUSY, &fimc->state);
 	ret = pm_runtime_get_sync(&fimc->pdev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_sync(&fimc->pdev->dev);
 		goto unlock;
+	}
 
 	ret = v4l2_fh_open(file);
 	if (ret) {
-- 
2.17.1