Hi Hans,
Thank you for the patch.
On Tuesday 25 February 2014 13:52:45 Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>
> The buf_finish op should always work, so change the return type to void.
> Update the few drivers that use it. Note that buf_finish can be called
> both when the DMA is streaming and when it isn't (during queue_cancel).
I'm not sure what branch this series is based on, but in the latest linuxtv
master branch buf_finish is only called from vb2_internal_dqbuf(), itself only
called from vb2_dqbuf() and __vb2_perform_fileio().
I would split the patch in two, one patch to change the buf_finish behaviour
inside the drivers and update the buf_finish documentation to explain when it
can be called in more details, and another one to change its return value to
void.
> Update drivers to check that where appropriate.
>
> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Acked-by: Pawel Osciak <pawel@xxxxxxxxxx>
> Reviewed-by: Pawel Osciak <pawel@xxxxxxxxxx>
> ---
> drivers/media/parport/bw-qcam.c | 6 ++++--
> drivers/media/pci/sta2x11/sta2x11_vip.c | 7 +++----
> drivers/media/platform/marvell-ccic/mcam-core.c | 3 +--
> drivers/media/usb/pwc/pwc-if.c | 16 +++++++++-------
> drivers/media/usb/uvc/uvc_queue.c | 6 +++---
> drivers/media/v4l2-core/videobuf2-core.c | 6 +-----
> drivers/staging/media/go7007/go7007-v4l2.c | 3 +--
> include/media/videobuf2-core.h | 2 +-
> 8 files changed, 23 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/media/parport/bw-qcam.c
> b/drivers/media/parport/bw-qcam.c index d12bd33..8d69bfb 100644
> --- a/drivers/media/parport/bw-qcam.c
> +++ b/drivers/media/parport/bw-qcam.c
> @@ -667,13 +667,16 @@ static void buffer_queue(struct vb2_buffer *vb)
> vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> }
>
> -static int buffer_finish(struct vb2_buffer *vb)
> +static void buffer_finish(struct vb2_buffer *vb)
> {
> struct qcam *qcam = vb2_get_drv_priv(vb->vb2_queue);
> void *vbuf = vb2_plane_vaddr(vb, 0);
> 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);
>
> @@ -691,7 +694,6 @@ static int buffer_finish(struct vb2_buffer *vb)
> if (len != size)
> vb->state = VB2_BUF_STATE_ERROR;
> vb2_set_plane_payload(vb, 0, len);
> - return 0;
> }
>
> static struct vb2_ops qcam_video_qops = {
> diff --git a/drivers/media/pci/sta2x11/sta2x11_vip.c
> b/drivers/media/pci/sta2x11/sta2x11_vip.c index e5cfb6c..bb11443 100644
> --- a/drivers/media/pci/sta2x11/sta2x11_vip.c
> +++ b/drivers/media/pci/sta2x11/sta2x11_vip.c
> @@ -327,7 +327,7 @@ static void buffer_queue(struct vb2_buffer *vb)
> }
> spin_unlock(&vip->lock);
> }
> -static int buffer_finish(struct vb2_buffer *vb)
> +static void buffer_finish(struct vb2_buffer *vb)
> {
> struct sta2x11_vip *vip = vb2_get_drv_priv(vb->vb2_queue);
> struct vip_buffer *vip_buf = to_vip_buffer(vb);
> @@ -337,9 +337,8 @@ static int buffer_finish(struct vb2_buffer *vb)
> list_del_init(&vip_buf->list);
> spin_unlock(&vip->lock);
>
> - vip_active_buf_next(vip);
> -
> - return 0;
> + 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/platform/marvell-ccic/mcam-core.c
> b/drivers/media/platform/marvell-ccic/mcam-core.c index 32fab30..8b34c48
> 100644
> --- a/drivers/media/platform/marvell-ccic/mcam-core.c
> +++ b/drivers/media/platform/marvell-ccic/mcam-core.c
> @@ -1238,7 +1238,7 @@ static int mcam_vb_sg_buf_prepare(struct vb2_buffer
> *vb) return 0;
> }
>
> -static int mcam_vb_sg_buf_finish(struct vb2_buffer *vb)
> +static void mcam_vb_sg_buf_finish(struct vb2_buffer *vb)
> {
> struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
> struct sg_table *sg_table = vb2_dma_sg_plane_desc(vb, 0);
> @@ -1246,7 +1246,6 @@ static int mcam_vb_sg_buf_finish(struct vb2_buffer
> *vb) if (sg_table)
> dma_unmap_sg(cam->dev, sg_table->sgl,
> sg_table->nents, DMA_FROM_DEVICE);
> - return 0;
> }
>
> static void mcam_vb_sg_buf_cleanup(struct vb2_buffer *vb)
> diff --git a/drivers/media/usb/pwc/pwc-if.c b/drivers/media/usb/pwc/pwc-if.c
> index abf365a..b9c9f10 100644
> --- a/drivers/media/usb/pwc/pwc-if.c
> +++ b/drivers/media/usb/pwc/pwc-if.c
> @@ -614,17 +614,19 @@ static int buffer_prepare(struct vb2_buffer *vb)
> return 0;
> }
>
> -static int buffer_finish(struct vb2_buffer *vb)
> +static void buffer_finish(struct vb2_buffer *vb)
> {
> struct pwc_device *pdev = vb2_get_drv_priv(vb->vb2_queue);
> struct pwc_frame_buf *buf = container_of(vb, struct pwc_frame_buf, vb);
>
> - /*
> - * Application has called dqbuf and is getting back a buffer we've
> - * filled, take the pwc data we've stored in buf->data and decompress
> - * it into a usable format, storing the result in the vb2_buffer
> - */
> - return pwc_decompress(pdev, buf);
> + if (vb->state == VB2_BUF_STATE_DONE) {
> + /*
> + * Application has called dqbuf and is getting back a buffer we've
> + * filled, take the pwc data we've stored in buf->data and decompress
> + * it into a usable format, storing the result in the vb2_buffer
> + */
> + pwc_decompress(pdev, buf);
> + }
> }
>
> static void buffer_cleanup(struct vb2_buffer *vb)
> diff --git a/drivers/media/usb/uvc/uvc_queue.c
> b/drivers/media/usb/uvc/uvc_queue.c index cd962be..db5984e 100644
> --- a/drivers/media/usb/uvc/uvc_queue.c
> +++ b/drivers/media/usb/uvc/uvc_queue.c
> @@ -104,15 +104,15 @@ static void uvc_buffer_queue(struct vb2_buffer *vb)
> spin_unlock_irqrestore(&queue->irqlock, flags);
> }
>
> -static int uvc_buffer_finish(struct vb2_buffer *vb)
> +static void uvc_buffer_finish(struct vb2_buffer *vb)
> {
> struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
> struct uvc_streaming *stream =
> 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);
> - return 0;
> + if (vb2_is_streaming(vb->vb2_queue))
> + 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 8f1578b..59bfd85 100644
> --- a/drivers/media/v4l2-core/videobuf2-core.c
> +++ b/drivers/media/v4l2-core/videobuf2-core.c
> @@ -1783,11 +1783,7 @@ static int vb2_internal_dqbuf(struct vb2_queue *q,
> struct v4l2_buffer *b, bool n if (ret < 0)
> return ret;
>
> - ret = call_vb_qop(vb, buf_finish, vb);
> - if (ret) {
> - dprintk(1, "dqbuf: buffer finish failed\n");
> - return ret;
> - }
> + call_vb_qop(vb, buf_finish, vb);
>
> switch (vb->state) {
> case VB2_BUF_STATE_DONE:
> diff --git a/drivers/staging/media/go7007/go7007-v4l2.c
> b/drivers/staging/media/go7007/go7007-v4l2.c index edc52e2..3a01576 100644
> --- a/drivers/staging/media/go7007/go7007-v4l2.c
> +++ b/drivers/staging/media/go7007/go7007-v4l2.c
> @@ -470,7 +470,7 @@ static int go7007_buf_prepare(struct vb2_buffer *vb)
> return 0;
> }
>
> -static int go7007_buf_finish(struct vb2_buffer *vb)
> +static void go7007_buf_finish(struct vb2_buffer *vb)
> {
> struct vb2_queue *vq = vb->vb2_queue;
> struct go7007 *go = vb2_get_drv_priv(vq);
> @@ -483,7 +483,6 @@ static int go7007_buf_finish(struct vb2_buffer *vb)
> V4L2_BUF_FLAG_PFRAME);
> buf->flags |= frame_type_flag;
> buf->field = V4L2_FIELD_NONE;
> - return 0;
> }
>
> static int go7007_start_streaming(struct vb2_queue *q, unsigned int count)
> diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
> index f04eb28..f443ce0 100644
> --- a/include/media/videobuf2-core.h
> +++ b/include/media/videobuf2-core.h
> @@ -311,7 +311,7 @@ struct vb2_ops {
>
> int (*buf_init)(struct vb2_buffer *vb);
> int (*buf_prepare)(struct vb2_buffer *vb);
> - int (*buf_finish)(struct vb2_buffer *vb);
> + void (*buf_finish)(struct vb2_buffer *vb);
> void (*buf_cleanup)(struct vb2_buffer *vb);
>
> int (*start_streaming)(struct vb2_queue *q, unsigned int count);
--
Regards,
Laurent Pinchart
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
