Em Mon, 9 Apr 2018 16:20:17 +0200
Hans Verkuil <hverkuil@xxxxxxxxx> escreveu:
> From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>
> This implements the V4L2 part of the request support. The main
> change is that vb2_qbuf and vb2_prepare_buf now have a new
> media_device pointer. This required changes to several drivers
> that did not use the vb2_ioctl_qbuf/prepare_buf helper functions.
>
> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> ---
> drivers/media/common/videobuf2/videobuf2-v4l2.c | 84 ++++++++++++++++++++----
> drivers/media/platform/omap3isp/ispvideo.c | 2 +-
> drivers/media/platform/s3c-camif/camif-capture.c | 4 +-
> drivers/media/platform/s5p-mfc/s5p_mfc_dec.c | 4 +-
> drivers/media/platform/s5p-mfc/s5p_mfc_enc.c | 4 +-
> drivers/media/platform/soc_camera/soc_camera.c | 4 +-
> drivers/media/usb/uvc/uvc_queue.c | 5 +-
> drivers/media/usb/uvc/uvc_v4l2.c | 3 +-
> drivers/media/usb/uvc/uvcvideo.h | 1 +
> drivers/media/v4l2-core/v4l2-mem2mem.c | 7 +-
> drivers/staging/media/davinci_vpfe/vpfe_video.c | 3 +-
> drivers/staging/media/omap4iss/iss_video.c | 3 +-
> drivers/usb/gadget/function/uvc_queue.c | 2 +-
> include/media/videobuf2-v4l2.h | 12 +++-
> 14 files changed, 106 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> index b8d370b97cca..73c1fd4da58a 100644
> --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
> +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> @@ -25,6 +25,7 @@
> #include <linux/kthread.h>
>
> #include <media/v4l2-dev.h>
> +#include <media/v4l2-device.h>
> #include <media/v4l2-fh.h>
> #include <media/v4l2-event.h>
> #include <media/v4l2-common.h>
> @@ -40,10 +41,12 @@ module_param(debug, int, 0644);
> pr_info("vb2-v4l2: %s: " fmt, __func__, ## arg); \
> } while (0)
>
> -/* Flags that are set by the vb2 core */
> +/* Flags that are set by us */
> #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \
> V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \
> V4L2_BUF_FLAG_PREPARED | \
> + V4L2_BUF_FLAG_IN_REQUEST | \
> + V4L2_BUF_FLAG_REQUEST_FD | \
> V4L2_BUF_FLAG_TIMESTAMP_MASK)
> /* Output buffer flags that should be passed on to the driver */
> #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \
> @@ -318,13 +321,17 @@ static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b
> return 0;
> }
>
> -static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
> - const char *opname)
> +static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev,
> + struct v4l2_buffer *b,
> + const char *opname,
> + struct media_request **p_req)
> {
> + struct media_request *req;
> struct vb2_v4l2_buffer *vbuf;
> struct vb2_buffer *vb;
> int ret;
>
> + *p_req = NULL;
> if (b->type != q->type) {
> dprintk(1, "%s: invalid buffer type\n", opname);
> return -EINVAL;
> @@ -354,7 +361,38 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
>
> /* Copy relevant information provided by the userspace */
> memset(vbuf->planes, 0, sizeof(vbuf->planes[0]) * vb->num_planes);
> - return vb2_fill_vb2_v4l2_buffer(vb, b);
> + ret = vb2_fill_vb2_v4l2_buffer(vb, b);
> + if (ret)
> + return ret;
> +
> + if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD))
> + return 0;
> +
> + if (vb->state != VB2_BUF_STATE_DEQUEUED) {
> + dprintk(1, "%s: buffer is not in dequeued state\n", opname);
> + return -EINVAL;
> + }
> +
> + if (b->request_fd < 0) {
> + dprintk(1, "%s: request_fd < 0\n", opname);
> + return -EINVAL;
> + }
> +
> + req = media_request_find(mdev, b->request_fd);
> + if (IS_ERR(req)) {
> + dprintk(1, "%s: invalid request_fd\n", opname);
> + return PTR_ERR(req);
> + }
> +
> + if (req->state != MEDIA_REQUEST_STATE_IDLE) {
> + dprintk(1, "%s: request is not idle\n", opname);
> + media_request_put(req);
> + return -EBUSY;
> + }
It is accessing req->state without locking. As I said before,
IMHO, it should really be an atomic var.
Also, on the changes introduced in this patch, it should be
doing the proper lock before using req (The way it is, it should
be locking the mutex - except that it won't work at IRQ),
or the entire logic should switch to some other locking type
or to use something like RCU.
> +
> + *p_req = req;
> +
> + return 0;
> }
>
> /*
> @@ -437,6 +475,9 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
> case VB2_BUF_STATE_ACTIVE:
> b->flags |= V4L2_BUF_FLAG_QUEUED;
> break;
> + case VB2_BUF_STATE_IN_REQUEST:
> + b->flags |= V4L2_BUF_FLAG_IN_REQUEST;
> + break;
> case VB2_BUF_STATE_ERROR:
> b->flags |= V4L2_BUF_FLAG_ERROR;
> /* fall through */
> @@ -455,6 +496,10 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
>
> if (vb2_buffer_in_use(q, vb))
> b->flags |= V4L2_BUF_FLAG_MAPPED;
> + if (vb->req_obj.req) {
> + b->flags |= V4L2_BUF_FLAG_REQUEST_FD;
> + b->request_fd = -1;
> + }
>
> if (!q->is_output &&
> b->flags & V4L2_BUF_FLAG_DONE &&
> @@ -533,8 +578,10 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
> }
> EXPORT_SYMBOL_GPL(vb2_reqbufs);
>
> -int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b)
> +int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev,
> + struct v4l2_buffer *b)
> {
> + struct media_request *req;
> int ret;
>
> if (vb2_fileio_is_active(q)) {
> @@ -542,9 +589,13 @@ int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b)
> return -EBUSY;
> }
>
> - ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf");
> -
> - return ret ? ret : vb2_core_prepare_buf(q, b->index, b, NULL);
> + ret = vb2_queue_or_prepare_buf(q, mdev, b, "prepare_buf", &req);
> + if (ret)
> + return ret;
> + ret = vb2_core_prepare_buf(q, b->index, b, req);
> + if (req)
> + media_request_put(req);
> + return ret;
> }
> EXPORT_SYMBOL_GPL(vb2_prepare_buf);
>
> @@ -602,8 +653,10 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
> }
> EXPORT_SYMBOL_GPL(vb2_create_bufs);
>
> -int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
> +int vb2_qbuf(struct vb2_queue *q, struct media_device *mdev,
> + struct v4l2_buffer *b)
> {
> + struct media_request *req;
> int ret;
>
> if (vb2_fileio_is_active(q)) {
> @@ -611,8 +664,13 @@ int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
> return -EBUSY;
> }
>
> - ret = vb2_queue_or_prepare_buf(q, b, "qbuf");
> - return ret ? ret : vb2_core_qbuf(q, b->index, b, NULL);
> + ret = vb2_queue_or_prepare_buf(q, mdev, b, "qbuf", &req);
> + if (ret)
> + return ret;
> + ret = vb2_core_qbuf(q, b->index, b, req);
> + if (req)
> + media_request_put(req);
> + return ret;
> }
> EXPORT_SYMBOL_GPL(vb2_qbuf);
>
> @@ -802,7 +860,7 @@ int vb2_ioctl_prepare_buf(struct file *file, void *priv,
>
> if (vb2_queue_is_busy(vdev, file))
> return -EBUSY;
> - return vb2_prepare_buf(vdev->queue, p);
> + return vb2_prepare_buf(vdev->queue, vdev->v4l2_dev->mdev, p);
> }
> EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf);
>
> @@ -821,7 +879,7 @@ int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
>
> if (vb2_queue_is_busy(vdev, file))
> return -EBUSY;
> - return vb2_qbuf(vdev->queue, p);
> + return vb2_qbuf(vdev->queue, vdev->v4l2_dev->mdev, p);
> }
> EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf);
>
> diff --git a/drivers/media/platform/omap3isp/ispvideo.c b/drivers/media/platform/omap3isp/ispvideo.c
> index bd564c2e767f..9fecbd8c6edd 100644
> --- a/drivers/media/platform/omap3isp/ispvideo.c
> +++ b/drivers/media/platform/omap3isp/ispvideo.c
> @@ -940,7 +940,7 @@ isp_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
> int ret;
>
> mutex_lock(&video->queue_lock);
> - ret = vb2_qbuf(&vfh->queue, b);
> + ret = vb2_qbuf(&vfh->queue, video->video.v4l2_dev->mdev, b);
> mutex_unlock(&video->queue_lock);
>
> return ret;
> diff --git a/drivers/media/platform/s3c-camif/camif-capture.c b/drivers/media/platform/s3c-camif/camif-capture.c
> index 9ab8e7ee2e1e..fafb6da3e804 100644
> --- a/drivers/media/platform/s3c-camif/camif-capture.c
> +++ b/drivers/media/platform/s3c-camif/camif-capture.c
> @@ -941,7 +941,7 @@ static int s3c_camif_qbuf(struct file *file, void *priv,
> if (vp->owner && vp->owner != priv)
> return -EBUSY;
>
> - return vb2_qbuf(&vp->vb_queue, buf);
> + return vb2_qbuf(&vp->vb_queue, vp->vdev.v4l2_dev->mdev, buf);
> }
>
> static int s3c_camif_dqbuf(struct file *file, void *priv,
> @@ -979,7 +979,7 @@ static int s3c_camif_prepare_buf(struct file *file, void *priv,
> struct v4l2_buffer *b)
> {
> struct camif_vp *vp = video_drvdata(file);
> - return vb2_prepare_buf(&vp->vb_queue, b);
> + return vb2_prepare_buf(&vp->vb_queue, vp->vdev.v4l2_dev->mdev, b);
> }
>
> static int s3c_camif_g_selection(struct file *file, void *priv,
> diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> index 5cf4d9921264..3d863e3f5798 100644
> --- a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> @@ -632,9 +632,9 @@ static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
> return -EIO;
> }
> if (buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> - return vb2_qbuf(&ctx->vq_src, buf);
> + return vb2_qbuf(&ctx->vq_src, NULL, buf);
> else if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> - return vb2_qbuf(&ctx->vq_dst, buf);
> + return vb2_qbuf(&ctx->vq_dst, NULL, buf);
> return -EINVAL;
> }
>
> diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c b/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
> index 5c0462ca9993..ed12d5d062e8 100644
> --- a/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
> +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
> @@ -1621,9 +1621,9 @@ static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
> mfc_err("Call on QBUF after EOS command\n");
> return -EIO;
> }
> - return vb2_qbuf(&ctx->vq_src, buf);
> + return vb2_qbuf(&ctx->vq_src, NULL, buf);
> } else if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> - return vb2_qbuf(&ctx->vq_dst, buf);
> + return vb2_qbuf(&ctx->vq_dst, NULL, buf);
> }
> return -EINVAL;
> }
> diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
> index e6787abc34ae..08adf9a79420 100644
> --- a/drivers/media/platform/soc_camera/soc_camera.c
> +++ b/drivers/media/platform/soc_camera/soc_camera.c
> @@ -394,7 +394,7 @@ static int soc_camera_qbuf(struct file *file, void *priv,
> if (icd->streamer != file)
> return -EBUSY;
>
> - return vb2_qbuf(&icd->vb2_vidq, p);
> + return vb2_qbuf(&icd->vb2_vidq, NULL, p);
> }
>
> static int soc_camera_dqbuf(struct file *file, void *priv,
> @@ -430,7 +430,7 @@ static int soc_camera_prepare_buf(struct file *file, void *priv,
> {
> struct soc_camera_device *icd = file->private_data;
>
> - return vb2_prepare_buf(&icd->vb2_vidq, b);
> + return vb2_prepare_buf(&icd->vb2_vidq, NULL, b);
> }
>
> static int soc_camera_expbuf(struct file *file, void *priv,
> diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
> index fecccb5e7628..8964e16f2b22 100644
> --- a/drivers/media/usb/uvc/uvc_queue.c
> +++ b/drivers/media/usb/uvc/uvc_queue.c
> @@ -300,12 +300,13 @@ int uvc_create_buffers(struct uvc_video_queue *queue,
> return ret;
> }
>
> -int uvc_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
> +int uvc_queue_buffer(struct uvc_video_queue *queue,
> + struct media_device *mdev, struct v4l2_buffer *buf)
> {
> int ret;
>
> mutex_lock(&queue->mutex);
> - ret = vb2_qbuf(&queue->queue, buf);
> + ret = vb2_qbuf(&queue->queue, mdev, buf);
> mutex_unlock(&queue->mutex);
>
> return ret;
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index bd32914259ae..3da5fdc002ac 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -751,7 +751,8 @@ static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
> if (!uvc_has_privileges(handle))
> return -EBUSY;
>
> - return uvc_queue_buffer(&stream->queue, buf);
> + return uvc_queue_buffer(&stream->queue,
> + stream->vdev.v4l2_dev->mdev, buf);
> }
>
> static int uvc_ioctl_expbuf(struct file *file, void *fh,
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index be5cf179228b..bc9ed18f043c 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -680,6 +680,7 @@ int uvc_query_buffer(struct uvc_video_queue *queue,
> int uvc_create_buffers(struct uvc_video_queue *queue,
> struct v4l2_create_buffers *v4l2_cb);
> int uvc_queue_buffer(struct uvc_video_queue *queue,
> + struct media_device *mdev,
> struct v4l2_buffer *v4l2_buf);
> int uvc_export_buffer(struct uvc_video_queue *queue,
> struct v4l2_exportbuffer *exp);
> diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
> index c4f963d96a79..438f1b869319 100644
> --- a/drivers/media/v4l2-core/v4l2-mem2mem.c
> +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
> @@ -20,6 +20,7 @@
> #include <media/videobuf2-v4l2.h>
> #include <media/v4l2-mem2mem.h>
> #include <media/v4l2-dev.h>
> +#include <media/v4l2-device.h>
> #include <media/v4l2-fh.h>
> #include <media/v4l2-event.h>
>
> @@ -388,11 +389,12 @@ EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
> int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
> struct v4l2_buffer *buf)
> {
> + struct video_device *vdev = video_devdata(file);
> struct vb2_queue *vq;
> int ret;
>
> vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
> - ret = vb2_qbuf(vq, buf);
> + ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
> if (!ret)
> v4l2_m2m_try_schedule(m2m_ctx);
>
> @@ -413,11 +415,12 @@ EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
> int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
> struct v4l2_buffer *buf)
> {
> + struct video_device *vdev = video_devdata(file);
> struct vb2_queue *vq;
> int ret;
>
> vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
> - ret = vb2_prepare_buf(vq, buf);
> + ret = vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
> if (!ret)
> v4l2_m2m_try_schedule(m2m_ctx);
>
> diff --git a/drivers/staging/media/davinci_vpfe/vpfe_video.c b/drivers/staging/media/davinci_vpfe/vpfe_video.c
> index 588743a6fd8a..00bf28e830d4 100644
> --- a/drivers/staging/media/davinci_vpfe/vpfe_video.c
> +++ b/drivers/staging/media/davinci_vpfe/vpfe_video.c
> @@ -1426,7 +1426,8 @@ static int vpfe_qbuf(struct file *file, void *priv,
> return -EACCES;
> }
>
> - return vb2_qbuf(&video->buffer_queue, p);
> + return vb2_qbuf(&video->buffer_queue,
> + video->video_dev.v4l2_dev->mdev, p);
> }
>
> /*
> diff --git a/drivers/staging/media/omap4iss/iss_video.c b/drivers/staging/media/omap4iss/iss_video.c
> index a3a83424a926..a35d1004b522 100644
> --- a/drivers/staging/media/omap4iss/iss_video.c
> +++ b/drivers/staging/media/omap4iss/iss_video.c
> @@ -805,9 +805,10 @@ iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
> static int
> iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
> {
> + struct iss_video *video = video_drvdata(file);
> struct iss_video_fh *vfh = to_iss_video_fh(fh);
>
> - return vb2_qbuf(&vfh->queue, b);
> + return vb2_qbuf(&vfh->queue, video->video.v4l2_dev->mdev, b);
> }
>
> static int
> diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c
> index 9e33d5206d54..f2497cb96abb 100644
> --- a/drivers/usb/gadget/function/uvc_queue.c
> +++ b/drivers/usb/gadget/function/uvc_queue.c
> @@ -166,7 +166,7 @@ int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
> unsigned long flags;
> int ret;
>
> - ret = vb2_qbuf(&queue->queue, buf);
> + ret = vb2_qbuf(&queue->queue, NULL, buf);
> if (ret < 0)
> return ret;
>
> diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
> index 097bf3e6951d..cf312ab4e7e8 100644
> --- a/include/media/videobuf2-v4l2.h
> +++ b/include/media/videobuf2-v4l2.h
> @@ -79,6 +79,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
> * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel
> *
> * @q: pointer to &struct vb2_queue with videobuf2 queue.
> + * @mdev: pointer to &struct media_device, may be NULL.
> * @b: buffer structure passed from userspace to
> * &v4l2_ioctl_ops->vidioc_prepare_buf handler in driver
> *
> @@ -90,15 +91,19 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
> * #) verifies the passed buffer,
> * #) calls &vb2_ops->buf_prepare callback in the driver (if provided),
> * in which driver-specific buffer initialization can be performed.
> + * #) if @b->request_fd is non-zero and @mdev->ops->req_queue is set,
> + * then bind the prepared buffer to the request.
> *
> * The return values from this function are intended to be directly returned
> * from &v4l2_ioctl_ops->vidioc_prepare_buf handler in driver.
> */
> -int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
> +int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev,
> + struct v4l2_buffer *b);
>
> /**
> * vb2_qbuf() - Queue a buffer from userspace
> * @q: pointer to &struct vb2_queue with videobuf2 queue.
> + * @mdev: pointer to &struct media_device, may be NULL.
> * @b: buffer structure passed from userspace to
> * &v4l2_ioctl_ops->vidioc_qbuf handler in driver
> *
> @@ -107,6 +112,8 @@ int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
> * This function:
> *
> * #) verifies the passed buffer;
> + * #) if @b->request_fd is non-zero and @mdev->ops->req_queue is set,
> + * then bind the buffer to the request.
> * #) if necessary, calls &vb2_ops->buf_prepare callback in the driver
> * (if provided), in which driver-specific buffer initialization can
> * be performed;
> @@ -116,7 +123,8 @@ int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
> * The return values from this function are intended to be directly returned
> * from &v4l2_ioctl_ops->vidioc_qbuf handler in driver.
> */
> -int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
> +int vb2_qbuf(struct vb2_queue *q, struct media_device *mdev,
> + struct v4l2_buffer *b);
>
> /**
> * vb2_expbuf() - Export a buffer as a file descriptor
Thanks,
Mauro
