linux-kernel - [PATCH 4.19 30/44] media: vb2: dont call __vb2_queue_cancel if vb2_start

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Date:   Tue, 18 Dec 2018 17:39:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: [PATCH 4.19 30/44] media: vb2: dont call __vb2_queue_cancel if vb2_start_streaming failed

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hans Verkuil <hverkuil-cisco@...all.nl>

commit 04990215dec43c424daff00d1f622167b8aafd1f upstream.

vb2_start_streaming() already rolls back the buffers, so there is no
need to call __vb2_queue_cancel(). Especially since __vb2_queue_cancel()
does too much, such as zeroing the q->queued_count value, causing vb2
to think that no buffers have been queued.

It appears that this call to __vb2_queue_cancel() is a left-over from
before commit b3379c6201bb3.

Fixes: b3379c6201bb3 ('vb2: only call start_streaming if sufficient buffers are queued')

Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Cc: <stable@...r.kernel.org>      # for v4.16 and up
Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/common/videobuf2/videobuf2-core.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -1755,10 +1755,8 @@ int vb2_core_streamon(struct vb2_queue *
 		if (ret)
 			return ret;
 		ret = vb2_start_streaming(q);
-		if (ret) {
-			__vb2_queue_cancel(q);
+		if (ret)
 			return ret;
-		}
 	}
 
 	q->streaming = 1;