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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Seung-Woo Kim <sw0312.kim@samsung.com>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Mauro Carvalho Chehab <mchehab@kernel.org>
Subject: [PATCH 4.9 37/97] media: exynos4-is: Fix recursive locking in isp_video_release()
Date:   Wed, 22 Jan 2020 10:28:41 +0100
Message-Id: <20200122092802.518015494@linuxfoundation.org>
In-Reply-To: <20200122092755.678349497@linuxfoundation.org>
References: <20200122092755.678349497@linuxfoundation.org>
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From: Seung-Woo Kim <sw0312.kim@samsung.com>

commit 704c6c80fb471d1bb0ef0d61a94617d1d55743cd upstream.

>From isp_video_release(), &isp->video_lock is held and subsequent
vb2_fop_release() tries to lock vdev->lock which is same with the
previous one. Replace vb2_fop_release() with _vb2_fop_release() to
fix the recursive locking.

Fixes: 1380f5754cb0 ("[media] videobuf2: Add missing lock held on vb2_fop_release")
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/platform/exynos4-is/fimc-isp-video.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/platform/exynos4-is/fimc-isp-video.c
+++ b/drivers/media/platform/exynos4-is/fimc-isp-video.c
@@ -316,7 +316,7 @@ static int isp_video_release(struct file
 		ivc->streaming = 0;
 	}
 
-	vb2_fop_release(file);
+	_vb2_fop_release(file, NULL);
 
 	if (v4l2_fh_is_singular_file(file)) {
 		fimc_pipeline_call(&ivc->ve, close);