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From: wu000273@umn.edu
To: kjlu@umn.edu
Cc: wu000273@umn.edu,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] media: vsp1: Fix a reference count leak.
Date: Sat, 13 Jun 2020 18:23:57 -0500	[thread overview]
Message-ID: <20200613232357.18155-1-wu000273@umn.edu> (raw)

From: Qiushi Wu <wu000273@umn.edu>

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code, causing incorrect ref count if
pm_runtime_put_noidle() is not called in error handling paths.
Thus call pm_runtime_put_noidle() if pm_runtime_get_sync() fails.

Fixes: 1e6af546ee66 ("[media] v4l: vsp1: Implement runtime PM support")
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
---
 drivers/media/platform/vsp1/vsp1_drv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c
index c650e45bb0ad..222c9e1261a0 100644
--- a/drivers/media/platform/vsp1/vsp1_drv.c
+++ b/drivers/media/platform/vsp1/vsp1_drv.c
@@ -846,8 +846,10 @@ static int vsp1_probe(struct platform_device *pdev)
 	pm_runtime_enable(&pdev->dev);
 
 	ret = pm_runtime_get_sync(&pdev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(&pdev->dev);
 		goto done;
+	}
 
 	vsp1->version = vsp1_read(vsp1, VI6_IP_VERSION);
 	pm_runtime_put_sync(&pdev->dev);
-- 
2.17.1


             reply	other threads:[~2020-06-13 23:24 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-13 23:23 wu000273 [this message]
2020-06-16  2:07 ` [PATCH] media: vsp1: Fix a reference count leak Laurent Pinchart
2020-06-16  2:09   ` Laurent Pinchart
2020-06-22 10:21     ` Hans Verkuil

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