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.riba...@gmail.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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