path: root/include/media/videobuf2-core.h
diff options
authorHans Verkuil <hans.verkuil@cisco.com>2014-09-20 16:16:35 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2014-09-21 20:57:30 -0300
commit58d75f4b1ce26324b4d809b18f94819843a98731 (patch)
tree9a8fbc40c7119ff9d6284d25d373b88fdb643312 /include/media/videobuf2-core.h
parent50394e7369d519ad0d732cb6913d2bbdf4213e2e (diff)
[media] vb2: fix VBI/poll regression
The recent conversion of saa7134 to vb2 unconvered a poll() bug that broke the teletext applications alevt and mtt. These applications expect that calling poll() without having called VIDIOC_STREAMON will cause poll() to return POLLERR. That did not happen in vb2. This patch fixes that behavior. It also fixes what should happen when poll() is called when STREAMON is called but no buffers have been queued. In that case poll() will also return POLLERR, but only for capture queues since output queues will always return POLLOUT anyway in that situation. This brings the vb2 behavior in line with the old videobuf behavior. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'include/media/videobuf2-core.h')
1 files changed, 4 insertions, 0 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 80fa7253e483..2fefcf491aa8 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -380,6 +380,9 @@ struct v4l2_fh;
* @start_streaming_called: start_streaming() was called successfully and we
* started streaming.
* @error: a fatal error occurred on the queue
+ * @waiting_for_buffers: used in poll() to check if vb2 is still waiting for
+ * buffers. Only set for capture queues if qbuf has not yet been
+ * called since poll() needs to return POLLERR in that situation.
* @fileio: file io emulator internal data, used only if emulator is active
* @threadio: thread io internal data, used only if thread is active
@@ -417,6 +420,7 @@ struct vb2_queue {
unsigned int streaming:1;
unsigned int start_streaming_called:1;
unsigned int error:1;
+ unsigned int waiting_for_buffers:1;
struct vb2_fileio_data *fileio;
struct vb2_threadio_data *threadio;

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