linux-kernel - [PATCH] vb2: Return 0 when streamon and streamoff are already on/off

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Date:	Fri,  8 Nov 2013 11:08:45 +0100
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Pawel Osciak <pawel@...iak.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org (open list:VIDEOBUF2 FRAMEWORK),
	linux-kernel@...r.kernel.org (open list),
	sylvester.nawrocki@...il.com, hverkuil@...all.nl
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH] vb2: Return 0 when streamon and streamoff are already on/off

According to the doc:

If VIDIOC_STREAMON is called when streaming is already in progress,
or if VIDIOC_STREAMOFF is called when streaming is already stopped,
then the ioctl does nothing and 0 is returned.

The current implementation was returning -EINVAL instead.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 drivers/media/v4l2-core/videobuf2-core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index c979946..a3c8eff 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1695,8 +1695,8 @@ int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
 	}
 
 	if (q->streaming) {
-		dprintk(1, "streamon: already streaming\n");
-		return -EBUSY;
+		dprintk(3, "streamon successful: already streaming\n");
+		return 0;
 	}
 
 	/*
@@ -1752,8 +1752,8 @@ int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
 	}
 
 	if (!q->streaming) {
-		dprintk(1, "streamoff: not streaming\n");
-		return -EINVAL;
+		dprintk(3, "streamoff successful: not streaming\n");
+		return 0;
 	}
 
 	/*
-- 
1.8.4.rc3

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