path: root/Documentation/video4linux
diff options
authorHans Verkuil <>2014-04-17 02:47:21 -0300
committerMauro Carvalho Chehab <>2014-04-23 10:12:51 -0300
commite37559b22c63b557d242bfa1a07ab1b8f7d5d9f1 (patch)
treec74ed6e62e384350c04c35bfdc7fdf34c82fcdb3 /Documentation/video4linux
parentac9687a2e6abd7d87af413d1a8eb78f947921464 (diff)
[media] vb2: stop_streaming should return void
The vb2 core ignores any return code from the stop_streaming op. And there really isn't anything it can do anyway in case of an error. So change the return type to void and update any drivers that implement it. The int return gave drivers the idea that this operation could actually fail, but that's really not the case. The pwc amd sdr-msi3101 drivers both had this construction: if (mutex_lock_interruptible(&s->v4l2_lock)) return -ERESTARTSYS; This has been updated to just call mutex_lock(). The stop_streaming op expects this to really stop streaming and I very much doubt this will work reliably if stop_streaming just returns without really stopping the DMA. Signed-off-by: Hans Verkuil <> Acked-by: Pawel Osciak <> Acked-by: Sakari Ailus <> Signed-off-by: Mauro Carvalho Chehab <>
Diffstat (limited to 'Documentation/video4linux')
1 files changed, 1 insertions, 2 deletions
diff --git a/Documentation/video4linux/v4l2-pci-skeleton.c b/Documentation/video4linux/v4l2-pci-skeleton.c
index 80251dc2c6cf..53dd346586f6 100644
--- a/Documentation/video4linux/v4l2-pci-skeleton.c
+++ b/Documentation/video4linux/v4l2-pci-skeleton.c
@@ -269,7 +269,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
* Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
* and passed on to the vb2 framework marked as STATE_ERROR.
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
struct skeleton *skel = vb2_get_drv_priv(vq);
@@ -277,7 +277,6 @@ static int stop_streaming(struct vb2_queue *vq)
/* Release all active buffers */
return_all_buffers(skel, VB2_BUF_STATE_ERROR);
- return 0;