[PATCH v3 08/15] [media] vb2: add .buffer_queued() to notify queueing in the driver

[Gustavo Padovan <gustavo@padovan.org>]

From: Gustavo Padovan <gustavo.padovan@collabora.com>

With the upcoming explicit synchronization support to V4L2 we need a
way to notify userspace when buffers are queued to the driver - buffers
with fences attached to it can only be queued once the fence signal, so
the queueing to the driver might be deferred.

Yet, userspace still wants to be notified, so the buffer_queued() callback
was added to vb2_buf_ops for that purpose.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
---
 include/media/videobuf2-core.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 41cda762ff0a..5ed8d3402474 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -415,6 +415,8 @@ struct vb2_ops {
  *			will return an error.
  * @copy_timestamp:	copy the timestamp from a userspace structure to
  *			the vb2_buffer struct.
+ * @buffer_queued:	VB2 uses this to notify the VB2-client that the buffer
+ *			was queued to the driver.
  */
 struct vb2_buf_ops {
 	int (*verify_planes_array)(struct vb2_buffer *vb, const void *pb);
@@ -422,6 +424,7 @@ struct vb2_buf_ops {
 	int (*fill_vb2_buffer)(struct vb2_buffer *vb, const void *pb,
 				struct vb2_plane *planes);
 	void (*copy_timestamp)(struct vb2_buffer *vb, const void *pb);
+	void (*buffer_queued)(struct vb2_buffer *vb);
 };
 
 /**
-- 
2.13.5