提交 9c0863b1 编写于 作者: H Hans Verkuil 提交者: Mauro Carvalho Chehab

[media] vb2: call buf_finish from __queue_cancel

If a queue was canceled, then the buf_finish op was never called for the
pending buffers. So add this call to queue_cancel. Before calling buf_finish
set the buffer state to PREPARED, which is the correct state. That way the
states DONE and ERROR will only be seen in buf_finish if streaming is in
progress.

Since buf_finish can now be called from non-streaming state we need to
adapt the handful of drivers that actually need to know this.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Acked-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>
上级 1a179481
......@@ -674,6 +674,9 @@ static void buffer_finish(struct vb2_buffer *vb)
int size = vb->vb2_queue->plane_sizes[0];
int len;
if (!vb2_is_streaming(vb->vb2_queue))
return;
mutex_lock(&qcam->lock);
parport_claim_or_block(qcam->pdev);
......
......@@ -337,7 +337,8 @@ static void buffer_finish(struct vb2_buffer *vb)
list_del_init(&vip_buf->list);
spin_unlock(&vip->lock);
vip_active_buf_next(vip);
if (vb2_is_streaming(vb->vb2_queue))
vip_active_buf_next(vip);
}
static int start_streaming(struct vb2_queue *vq, unsigned int count)
......
......@@ -113,7 +113,8 @@ static void uvc_buffer_finish(struct vb2_buffer *vb)
container_of(queue, struct uvc_streaming, queue);
struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf);
uvc_video_clock_update(stream, &vb->v4l2_buf, buf);
if (vb->state == VB2_BUF_STATE_DONE)
uvc_video_clock_update(stream, &vb->v4l2_buf, buf);
}
static void uvc_wait_prepare(struct vb2_queue *vq)
......
......@@ -1929,9 +1929,22 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
/*
* Reinitialize all buffers for next use.
* Make sure to call buf_finish for any queued buffers. Normally
* that's done in dqbuf, but that's not going to happen when we
* cancel the whole queue. Note: this code belongs here, not in
* __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical
* call to __fill_v4l2_buffer() after buf_finish(). That order can't
* be changed, so we can't move the buf_finish() to __vb2_dqbuf().
*/
for (i = 0; i < q->num_buffers; ++i)
__vb2_dqbuf(q->bufs[i]);
for (i = 0; i < q->num_buffers; ++i) {
struct vb2_buffer *vb = q->bufs[i];
if (vb->state != VB2_BUF_STATE_DEQUEUED) {
vb->state = VB2_BUF_STATE_PREPARED;
call_vb_qop(vb, buf_finish, vb);
}
__vb2_dqbuf(vb);
}
}
static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
......
......@@ -276,7 +276,15 @@ struct vb2_buffer {
* in driver; optional
* @buf_finish: called before every dequeue of the buffer back to
* userspace; drivers may perform any operations required
* before userspace accesses the buffer; optional
* before userspace accesses the buffer; optional. The
* buffer state can be one of the following: DONE and
* ERROR occur while streaming is in progress, and the
* PREPARED state occurs when the queue has been canceled
* and all pending buffers are being returned to their
* default DEQUEUED state. Typically you only have to do
* something if the state is VB2_BUF_STATE_DONE, since in
* all other cases the buffer contents will be ignored
* anyway.
* @buf_cleanup: called once before the buffer is freed; drivers may
* perform any additional cleanup; optional
* @start_streaming: called once to enter 'streaming' state; the driver may
......
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