linux-kernel - [PATCH] media: rcar-vin: Fix a reference count leak.

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Date:   Sat, 13 Jun 2020 18:04:32 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ulrich Hecht <uli+renesas@...nd.eu>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] media: rcar-vin: Fix a reference count leak.

From: Qiushi Wu <wu000273@....edu>

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code. Thus call pm_runtime_put_noidle()
if pm_runtime_get_sync() fails.

Fixes: 2a18fbec1dab ("media: rcar-vin: Move pm_runtime_{get,put} out of helpers")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/media/platform/rcar-vin/rcar-v4l2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
index f421e2584875..06808be35f98 100644
--- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
+++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
@@ -835,8 +835,10 @@ static int rvin_open(struct file *file)
 	int ret;
 
 	ret = pm_runtime_get_sync(vin->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(vin->dev);
 		return ret;
+	}
 
 	ret = mutex_lock_interruptible(&vin->lock);
 	if (ret)
-- 
2.17.1