From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
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: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Acked-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/media/parport/bw-qcam.c | 3 +++
drivers/media/pci/sta2x11/sta2x11_vip.c | 3 ++-
drivers/media/usb/uvc/uvc_queue.c | 3 ++-
drivers/media/v4l2-core/videobuf2-core.c | 17 +++++++++++++++--
include/media/videobuf2-core.h | 10 +++++++++-
5 files changed, 31 insertions(+), 5 deletions(-)
diff --git a/drivers/media/parport/bw-qcam.c b/drivers/media/parport/bw-qcam.c
index 0166aef..8d69bfb 100644
--- a/drivers/media/parport/bw-qcam.c
+++ b/drivers/media/parport/bw-qcam.c
@@ -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);
diff --git a/drivers/media/pci/sta2x11/sta2x11_vip.c b/drivers/media/pci/sta2x11/sta2x11_vip.c
index e66556c..bb11443 100644
--- a/drivers/media/pci/sta2x11/sta2x11_vip.c
+++ b/drivers/media/pci/sta2x11/sta2x11_vip.c
@@ -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)
diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index cca2c6e..ab9f96e 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -111,7 +111,8 @@ 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)
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 59bfd85..f42520b 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1878,9 +1878,22 @@ 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)
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index f443ce0..3cb0bcf 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -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
--
1.9.0
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