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

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Message-Id: <20200613223008.11720-1-wu000273@umn.edu>
Date:   Sat, 13 Jun 2020 17:30:08 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hans.verkuil@...co.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: 90dedce9bc54 ("media: rcar-vin: add function to manipulate Gen3 chsel value")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/media/platform/rcar-vin/rcar-dma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
index 1a30cd036371..95bc9e0e8792 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -1392,8 +1392,10 @@ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel)
 	int ret;
 
 	ret = pm_runtime_get_sync(vin->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(vin->dev);
 		return ret;
+	}
 
 	/* Make register writes take effect immediately. */
 	vnmc = rvin_read(vin, VNMC_REG);
-- 
2.17.1