Re: [PATCH v3 2/3] media: au0828 - convert to use videobuf2

Shuah Khan
2015-01-22T16:16:08Z

Hi Prabhakar,

thanks for the review, please see in-line.

On 01/22/2015 05:41 AM, Lad, Prabhakar wrote:
> Hi Shuah,
>
> Thanks for the patch.
>
> On Tue, Jan 13, 2015 at 2:56 AM, Shuah Khan <shuahkh@osg.samsung.com> wrote:
>> Convert au0828 to use videobuf2. Tested with NTSC.
>> Tested video and vbi devices with xawtv, tvtime,
>> and vlc. Ran v4l2-compliance to ensure there are
>> no regressions. video now has no failures and vbi
>> has 3 fewer failures.
>>
>> video before:
>> test VIDIOC_G_FMT: FAIL 3 failures
>> Total: 72, Succeeded: 69, Failed: 3, Warnings: 0
>>
>> Video after:
>> Total: 72, Succeeded: 72, Failed: 0, Warnings: 18
>>
>> vbi before:
>> test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: FAIL
>> test VIDIOC_EXPBUF: FAIL
>> test USERPTR: FAIL
>> Total: 72, Succeeded: 66, Failed: 6, Warnings: 0
>>
> [Snip]
>> - init_waitqueue_head(&dma_q->wq);
>> -
>> /* submit urbs and enables IRQ */
>> for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
>> rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
>> @@ -308,16 +303,12 @@ static inline void buffer_filled(struct au0828_dev *dev,
>> struct au0828_buffer *buf)
>> {
>> /* Advice that buffer was filled */
>> - au0828_isocdbg("[%p/%d] wakeup\n", buf, buf->vb.i);
>> -
>> - buf->vb.state = VIDEOBUF_DONE;
>> - buf->vb.field_count++;
>> - v4l2_get_timestamp(&buf->vb.ts);
>> + au0828_isocdbg("[%p/%d] wakeup\n", buf, buf->top_field);
>>
>> - dev->isoc_ctl.buf = NULL;
>> -
>> - list_del(&buf->vb.queue);
>> - wake_up(&buf->vb.done);
>> + buf->vb.v4l2_buf.sequence = dev->frame_count++;
>> + buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
>> + v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
>> + vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
>> }
>>
>> static inline void vbi_buffer_filled(struct au0828_dev *dev,
>> @@ -325,16 +316,12 @@ static inline void vbi_buffer_filled(struct au0828_dev *dev,
>> struct au0828_buffer *buf)
>> {
>> /* Advice that buffer was filled */
>> - au0828_isocdbg("[%p/%d] wakeup\n", buf, buf->vb.i);
>> -
>> - buf->vb.state = VIDEOBUF_DONE;
>> - buf->vb.field_count++;
>> - v4l2_get_timestamp(&buf->vb.ts);
>> + au0828_isocdbg("[%p/%d] wakeup\n", buf, buf->top_field);
>>
>> - dev->isoc_ctl.vbi_buf = NULL;
>> -
>> - list_del(&buf->vb.queue);
>> - wake_up(&buf->vb.done);
>> + buf->vb.v4l2_buf.sequence = dev->vbi_frame_count++;
>> + buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
>> + v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
>> + vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
>> }
>>
> Why not just have one single buffer_filled function ? just check the
> queue type and assign the dev->isoc_ctl.buf/ dev->isoc_ctl.vbi_buf
> to NULL.

Yes. These two routines could be collapsed into a single. Is it okay if
I made that change in a separate patch?

>
>> /*
>> @@ -353,8 +340,8 @@ static void au0828_copy_video(struct au0828_dev *dev,
>> if (len == 0)
>> return;
>>
>> - if (dma_q->pos + len > buf->vb.size)
>> - len = buf->vb.size - dma_q->pos;
>> + if (dma_q->pos + len > buf->length)
>> + len = buf->length - dma_q->pos;
>>
>> startread = p;
>> remain = len;
>> @@ -372,11 +359,11 @@ static void au0828_copy_video(struct au0828_dev *dev,
>> lencopy = bytesperline - currlinedone;
>> lencopy = lencopy > remain ? remain : lencopy;
>>
>> - if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
>> + if ((char *)startwrite + lencopy > (char *)outp + buf->length) {
>> au0828_isocdbg("Overflow of %zi bytes past buffer end (1)\n",
>> ((char *)startwrite + lencopy) -
>> - ((char *)outp + buf->vb.size));
>> - remain = (char *)outp + buf->vb.size - (char *)startwrite;
>> + ((char *)outp + buf->length));
>> + remain = (char *)outp + buf->length - (char *)startwrite;
>> lencopy = remain;
>> }
>> if (lencopy <= 0)
>> @@ -394,11 +381,11 @@ static void au0828_copy_video(struct au0828_dev *dev,
>> lencopy = bytesperline;
>>
>> if ((char *)startwrite + lencopy > (char *)outp +
>> - buf->vb.size) {
>> + buf->length) {
>> au0828_isocdbg("Overflow %zi bytes past buf end (2)\n",
>> ((char *)startwrite + lencopy) -
>> - ((char *)outp + buf->vb.size));
>> - lencopy = remain = (char *)outp + buf->vb.size -
>> + ((char *)outp + buf->length));
>> + lencopy = remain = (char *)outp + buf->length -
>> (char *)startwrite;
>> }
>> if (lencopy <= 0)
>> @@ -434,7 +421,11 @@ static inline void get_next_buf(struct au0828_dmaqueue *dma_q,
>> }
>>
>> /* Get the next buffer */
>> - *buf = list_entry(dma_q->active.next, struct au0828_buffer, vb.queue);
>> + *buf = list_entry(dma_q->active.next, struct au0828_buffer, list);
>> + /* Cleans up buffer - Useful for testing for frame/URB loss */
>> + list_del(&(*buf)->list);
>> + dma_q->pos = 0;
>> + (*buf)->vb_buf = (*buf)->mem;
>> dev->isoc_ctl.buf = *buf;
>>
>> return;
>> @@ -472,8 +463,8 @@ static void au0828_copy_vbi(struct au0828_dev *dev,
>>
>> bytesperline = dev->vbi_width;
>>
>> - if (dma_q->pos + len > buf->vb.size)
>> - len = buf->vb.size - dma_q->pos;
>> + if (dma_q->pos + len > buf->length)
>> + len = buf->length - dma_q->pos;
>>
>> startread = p;
>> startwrite = outp + (dma_q->pos / 2);
>> @@ -496,7 +487,6 @@ static inline void vbi_get_next_buf(struct au0828_dmaqueue *dma_q,
>> struct au0828_buffer **buf)
>> {
>> struct au0828_dev *dev = container_of(dma_q, struct au0828_dev, vbiq);
>> - char *outp;
>>
>> if (list_empty(&dma_q->active)) {
>> au0828_isocdbg("No active queue to serve\n");
>> @@ -506,13 +496,12 @@ static inline void vbi_get_next_buf(struct au0828_dmaqueue *dma_q,
>> }
>>
>> /* Get the next buffer */
>> - *buf = list_entry(dma_q->active.next, struct au0828_buffer, vb.queue);
>> + *buf = list_entry(dma_q->active.next, struct au0828_buffer, list);
>> /* Cleans up buffer - Useful for testing for frame/URB loss */
>> - outp = videobuf_to_vmalloc(&(*buf)->vb);
>> - memset(outp, 0x00, (*buf)->vb.size);
>> -
>> + list_del(&(*buf)->list);
>> + dma_q->pos = 0;
>> + (*buf)->vb_buf = (*buf)->mem;
>> dev->isoc_ctl.vbi_buf = *buf;
>> -
>> return;
>> }
>>
>> @@ -548,11 +537,11 @@ static inline int au0828_isoc_copy(struct au0828_dev *dev, struct urb *urb)
>>
>> buf = dev->isoc_ctl.buf;
>> if (buf != NULL)
>> - outp = videobuf_to_vmalloc(&buf->vb);
>> + outp = vb2_plane_vaddr(&buf->vb, 0);
>>
>> vbi_buf = dev->isoc_ctl.vbi_buf;
>> if (vbi_buf != NULL)
>> - vbioutp = videobuf_to_vmalloc(&vbi_buf->vb);
>> + vbioutp = vb2_plane_vaddr(&vbi_buf->vb, 0);
>>
>> for (i = 0; i < urb->number_of_packets; i++) {
>> int status = urb->iso_frame_desc[i].status;
>> @@ -592,8 +581,8 @@ static inline int au0828_isoc_copy(struct au0828_dev *dev, struct urb *urb)
>> if (vbi_buf == NULL)
>> vbioutp = NULL;
>> else
>> - vbioutp = videobuf_to_vmalloc(
>> - &vbi_buf->vb);
>> + vbioutp = vb2_plane_vaddr(
>> + &vbi_buf->vb, 0);
>>
>> /* Video */
>> if (buf != NULL)
>> @@ -602,7 +591,7 @@ static inline int au0828_isoc_copy(struct au0828_dev *dev, struct urb *urb)
>> if (buf == NULL)
>> outp = NULL;
>> else
>> - outp = videobuf_to_vmalloc(&buf->vb);
>> + outp = vb2_plane_vaddr(&buf->vb, 0);
>>
>> /* As long as isoc traffic is arriving, keep
>> resetting the timer */
>> @@ -656,130 +645,59 @@ static inline int au0828_isoc_copy(struct au0828_dev *dev, struct urb *urb)
>> return rc;
>> }
>>
>> -static int
>> -buffer_setup(struct videobuf_queue *vq, unsigned int *count,
>> - unsigned int *size)
>> +static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
>> + unsigned int *nbuffers, unsigned int *nplanes,
>> + unsigned int sizes[], void *alloc_ctxs[])
>> {
>> - struct au0828_fh *fh = vq->priv_data;
>> - *size = (fh->dev->width * fh->dev->height * 16 + 7) >> 3;
>> -
>> - if (0 == *count)
>> - *count = AU0828_DEF_BUF;
>> + struct au0828_dev *dev = vb2_get_drv_priv(vq);
>> + unsigned long img_size = dev->height * dev->bytesperline;
>> + unsigned long size;
>>
>> - if (*count < AU0828_MIN_BUF)
>> - *count = AU0828_MIN_BUF;
>> - return 0;
>> -}
>> + size = fmt ? fmt->fmt.pix.sizeimage : img_size;
>> + if (size < img_size)
>> + return -EINVAL;
>>
>> -/* This is called *without* dev->slock held; please keep it that way */
>> -static void free_buffer(struct videobuf_queue *vq, struct au0828_buffer *buf)
>> -{
>> - struct au0828_fh *fh = vq->priv_data;
>> - struct au0828_dev *dev = fh->dev;
>> - unsigned long flags = 0;
>> - if (in_interrupt())
>> - BUG();
>> -
>> - /* We used to wait for the buffer to finish here, but this didn't work
>> - because, as we were keeping the state as VIDEOBUF_QUEUED,
>> - videobuf_queue_cancel marked it as finished for us.
>> - (Also, it could wedge forever if the hardware was misconfigured.)
>> -
>> - This should be safe; by the time we get here, the buffer isn't
>> - queued anymore. If we ever start marking the buffers as
>> - VIDEOBUF_ACTIVE, it won't be, though.
>> - */
>> - spin_lock_irqsave(&dev->slock, flags);
>> - if (dev->isoc_ctl.buf == buf)
>> - dev->isoc_ctl.buf = NULL;
>> - spin_unlock_irqrestore(&dev->slock, flags);
>> + *nplanes = 1;
>> + sizes[0] = size;
>>
>> - videobuf_vmalloc_free(&buf->vb);
>> - buf->vb.state = VIDEOBUF_NEEDS_INIT;
>> + return 0;
>> }
>>
>> static int
>> -buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
>> - enum v4l2_field field)
>> +buffer_prepare(struct vb2_buffer *vb)
>> {
>> - struct au0828_fh *fh = vq->priv_data;
>> struct au0828_buffer *buf = container_of(vb, struct au0828_buffer, vb);
>> - struct au0828_dev *dev = fh->dev;
>> - int rc = 0, urb_init = 0;
>> + struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
>>
>> - buf->vb.size = (fh->dev->width * fh->dev->height * 16 + 7) >> 3;
>> + buf->length = dev->height * dev->bytesperline;
>>
>> - if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
>> + if (vb2_plane_size(vb, 0) < buf->length) {
>> + pr_err("%s data will not fit into plane (%lu < %lu)\n",
>> + __func__, vb2_plane_size(vb, 0), buf->length);
>> return -EINVAL;
>> -
>> - buf->vb.width = dev->width;
>> - buf->vb.height = dev->height;
>> - buf->vb.field = field;
>> -
>> - if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
>> - rc = videobuf_iolock(vq, &buf->vb, NULL);
>> - if (rc < 0) {
>> - pr_info("videobuf_iolock failed\n");
>> - goto fail;
>> - }
>> }
>> -
>> - if (!dev->isoc_ctl.num_bufs)
>> - urb_init = 1;
>> -
>> - if (urb_init) {
>> - rc = au0828_init_isoc(dev, AU0828_ISO_PACKETS_PER_URB,
>> - AU0828_MAX_ISO_BUFS, dev->max_pkt_size,
>> - au0828_isoc_copy);
>> - if (rc < 0) {
>> - pr_info("au0828_init_isoc failed\n");
>> - goto fail;
>> - }
>> - }
>> -
>> - buf->vb.state = VIDEOBUF_PREPARED;
>> + vb2_set_plane_payload(&buf->vb, 0, buf->length);
>> return 0;
>> -
>> -fail:
>> - free_buffer(vq, buf);
>> - return rc;
>> }
>>
>> static void
>> -buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
>> +buffer_queue(struct vb2_buffer *vb)
>> {
>> struct au0828_buffer *buf = container_of(vb,
>> struct au0828_buffer,
>> vb);
>> - struct au0828_fh *fh = vq->priv_data;
>> - struct au0828_dev *dev = fh->dev;
>> + struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
>> struct au0828_dmaqueue *vidq = &dev->vidq;
>> + unsigned long flags = 0;
>>
>> - buf->vb.state = VIDEOBUF_QUEUED;
>> - list_add_tail(&buf->vb.queue, &vidq->active);
>> -}
>> -
>> -static void buffer_release(struct videobuf_queue *vq,
>> - struct videobuf_buffer *vb)
>> -{
>> - struct au0828_buffer *buf = container_of(vb,
>> - struct au0828_buffer,
>> - vb);
>> + buf->mem = vb2_plane_vaddr(vb, 0);
>> + buf->length = vb2_plane_size(vb, 0);
>>
>> - free_buffer(vq, buf);
>> + spin_lock_irqsave(&dev->slock, flags);
>> + list_add_tail(&buf->list, &vidq->active);
>> + spin_unlock_irqrestore(&dev->slock, flags);
>> }
>>
>> -static struct videobuf_queue_ops au0828_video_qops = {
>> - .buf_setup = buffer_setup,
>> - .buf_prepare = buffer_prepare,
>> - .buf_queue = buffer_queue,
>> - .buf_release = buffer_release,
>> -};
>> -
>> -/* ------------------------------------------------------------------
>> - V4L2 interface
>> - ------------------------------------------------------------------*/
>> -
>> static int au0828_i2s_init(struct au0828_dev *dev)
>> {
>> /* Enable i2s mode */
>> @@ -828,7 +746,7 @@ static int au0828_analog_stream_enable(struct au0828_dev *d)
>> return 0;
>> }
>>
>> -int au0828_analog_stream_disable(struct au0828_dev *d)
>> +static int au0828_analog_stream_disable(struct au0828_dev *d)
>> {
>> dprintk(1, "au0828_analog_stream_disable called\n");
>> au0828_writereg(d, AU0828_SENSORCTRL_100, 0x0);
>> @@ -861,78 +779,141 @@ static int au0828_stream_interrupt(struct au0828_dev *dev)
>> return 0;
>> }
>>
>> -/*
>> - * au0828_release_resources
>> - * unregister v4l2 devices
>> - */
>> -void au0828_analog_unregister(struct au0828_dev *dev)
>> +int au0828_start_analog_streaming(struct vb2_queue *vq, unsigned int count)
>> {
>> - dprintk(1, "au0828_release_resources called\n");
>> - mutex_lock(&au0828_sysfs_lock);
>> + struct au0828_dev *dev = vb2_get_drv_priv(vq);
>> + int rc = 0;
>>
>> - if (dev->vdev)
>> - video_unregister_device(dev->vdev);
>> - if (dev->vbi_dev)
>> - video_unregister_device(dev->vbi_dev);
>> + dprintk(1, "au0828_start_analog_streaming called %d\n",
>> + dev->streaming_users);
>>
>> - mutex_unlock(&au0828_sysfs_lock);
>> -}
>> + if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
>> + dev->frame_count = 0;
>> + else
>> + dev->vbi_frame_count = 0;
>> +
>> + if (dev->streaming_users == 0) {
>> + /* If we were doing ac97 instead of i2s, it would go here...*/
>> + au0828_i2s_init(dev);
>> + rc = au0828_init_isoc(dev, AU0828_ISO_PACKETS_PER_URB,
>> + AU0828_MAX_ISO_BUFS, dev->max_pkt_size,
>> + au0828_isoc_copy);
>> + if (rc < 0) {
>> + pr_info("au0828_init_isoc failed\n");
>> + return rc;
>> + }
>>
>> + if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
>> + v4l2_device_call_all(&dev->v4l2_dev, 0, video,
>> + s_stream, 1);
>> + dev->vid_timeout_running = 1;
>> + mod_timer(&dev->vid_timeout, jiffies + (HZ / 10));
>> + } else if (vq->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
>> + dev->vbi_timeout_running = 1;
>> + mod_timer(&dev->vbi_timeout, jiffies + (HZ / 10));
>> + }
>> + }
>> + dev->streaming_users++;
>> + return rc;
>> +}
>>
>> -/* Usage lock check functions */
>> -static int res_get(struct au0828_fh *fh, unsigned int bit)
>> +static void au0828_stop_streaming(struct vb2_queue *vq)
>> {
>> - struct au0828_dev *dev = fh->dev;
>> + struct au0828_dev *dev = vb2_get_drv_priv(vq);
>> + struct au0828_dmaqueue *vidq = &dev->vidq;
>> + unsigned long flags = 0;
>> + int i;
>>
>> - if (fh->resources & bit)
>> - /* have it already allocated */
>> - return 1;
>> + dprintk(1, "au0828_stop_streaming called %d\n", dev->streaming_users);
>>
>> - /* is it free? */
>> - if (dev->resources & bit) {
>> - /* no, someone else uses it */
>> - return 0;
>> + if (dev->streaming_users-- == 1)
>> + au0828_uninit_isoc(dev);
>> +
>> + spin_lock_irqsave(&dev->slock, flags);
>> + if (dev->isoc_ctl.buf != NULL) {
>> + vb2_buffer_done(&dev->isoc_ctl.buf->vb, VB2_BUF_STATE_ERROR);
>> + dev->isoc_ctl.buf = NULL;
>> }
>> - /* it's free, grab it */
>> - fh->resources |= bit;
>> - dev->resources |= bit;
>> - dprintk(1, "res: get %d\n", bit);
>> + while (!list_empty(&vidq->active)) {
>> + struct au0828_buffer *buf;
>>
>> - return 1;
>> -}
>> + buf = list_entry(vidq->active.next, struct au0828_buffer, list);
>> + vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
>> + list_del(&buf->list);
>> + }
>>
>> -static int res_check(struct au0828_fh *fh, unsigned int bit)
>> -{
>> - return fh->resources & bit;
>> -}
>> + v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
>>
>> -static int res_locked(struct au0828_dev *dev, unsigned int bit)
>> -{
>> - return dev->resources & bit;
>> + for (i = 0; i < AU0828_MAX_INPUT; i++) {
>> + if (AUVI_INPUT(i).audio_setup == NULL)
>> + continue;
>> + (AUVI_INPUT(i).audio_setup)(dev, 0);
>> + }
>> + spin_unlock_irqrestore(&dev->slock, flags);
>> +
>> + dev->vid_timeout_running = 0;
>> + del_timer_sync(&dev->vid_timeout);
>> }
>>
>> -static void res_free(struct au0828_fh *fh, unsigned int bits)
>> +void au0828_stop_vbi_streaming(struct vb2_queue *vq)
>> {
>> - struct au0828_dev *dev = fh->dev;
>> + struct au0828_dev *dev = vb2_get_drv_priv(vq);
>> + struct au0828_dmaqueue *vbiq = &dev->vbiq;
>> + unsigned long flags = 0;
>> +
>> + dprintk(1, "au0828_stop_vbi_streaming called %d\n",
>> + dev->streaming_users);
>> +
>> + if (dev->streaming_users-- == 1)
>> + au0828_uninit_isoc(dev);
>>
>> - BUG_ON((fh->resources & bits) != bits);
>> + spin_lock_irqsave(&dev->slock, flags);
>> + if (dev->isoc_ctl.vbi_buf != NULL) {
>> + vb2_buffer_done(&dev->isoc_ctl.vbi_buf->vb,
>> + VB2_BUF_STATE_ERROR);
>> + dev->isoc_ctl.vbi_buf = NULL;
>> + }
>> + while (!list_empty(&vbiq->active)) {
>> + struct au0828_buffer *buf;
>> +
>> + buf = list_entry(vbiq->active.next, struct au0828_buffer, list);
>> + list_del(&buf->list);
>> + vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
>> + }
>> + spin_unlock_irqrestore(&dev->slock, flags);
>>
>> - fh->resources &= ~bits;
>> - dev->resources &= ~bits;
>> - dprintk(1, "res: put %d\n", bits);
>> + dev->vbi_timeout_running = 0;
>> + del_timer_sync(&dev->vbi_timeout);
>> }
>>
>> -static int get_ressource(struct au0828_fh *fh)
>> +static struct vb2_ops au0828_video_qops = {
>> + .queue_setup = queue_setup,
>> + .buf_prepare = buffer_prepare,
>> + .buf_queue = buffer_queue,
>> + .start_streaming = au0828_start_analog_streaming,
>> + .stop_streaming = au0828_stop_streaming,
>> + .wait_prepare = vb2_ops_wait_prepare,
>> + .wait_finish = vb2_ops_wait_finish,
>> +};
>> +
>> +/* ------------------------------------------------------------------
>> + V4L2 interface
>> + ------------------------------------------------------------------*/
>> +/*
>> + * au0828_analog_unregister
>> + * unregister v4l2 devices
>> + */
>> +void au0828_analog_unregister(struct au0828_dev *dev)
>> {
>> - switch (fh->type) {
>> - case V4L2_BUF_TYPE_VIDEO_CAPTURE:
>> - return AU0828_RESOURCE_VIDEO;
>> - case V4L2_BUF_TYPE_VBI_CAPTURE:
>> - return AU0828_RESOURCE_VBI;
>> - default:
>> - BUG();
>> - return 0;
>> - }
>> + dprintk(1, "au0828_analog_unregister called\n");
>> + mutex_lock(&au0828_sysfs_lock);
>> +
>> + if (dev->vdev)
>> + video_unregister_device(dev->vdev);
>> + if (dev->vbi_dev)
>> + video_unregister_device(dev->vbi_dev);
>> +
>> + mutex_unlock(&au0828_sysfs_lock);
>> }
>>
>> /* This function ensures that video frames continue to be delivered even if
>> @@ -950,8 +931,8 @@ static void au0828_vid_buffer_timeout(unsigned long data)
>>
>> buf = dev->isoc_ctl.buf;
>> if (buf != NULL) {
>> - vid_data = videobuf_to_vmalloc(&buf->vb);
>> - memset(vid_data, 0x00, buf->vb.size); /* Blank green frame */
>> + vid_data = vb2_plane_vaddr(&buf->vb, 0);
>> + memset(vid_data, 0x00, buf->length); /* Blank green frame */
>> buffer_filled(dev, dma_q, buf);
>> }
>> get_next_buf(dma_q, &buf);
>> @@ -974,8 +955,8 @@ static void au0828_vbi_buffer_timeout(unsigned long data)
>>
>> buf = dev->isoc_ctl.vbi_buf;
>> if (buf != NULL) {
>> - vbi_data = videobuf_to_vmalloc(&buf->vb);
>> - memset(vbi_data, 0x00, buf->vb.size);
>> + vbi_data = vb2_plane_vaddr(&buf->vb, 0);
>> + memset(vbi_data, 0x00, buf->length);
>> vbi_buffer_filled(dev, dma_q, buf);
>> }
>> vbi_get_next_buf(dma_q, &buf);
>> @@ -985,105 +966,65 @@ static void au0828_vbi_buffer_timeout(unsigned long data)
>> spin_unlock_irqrestore(&dev->slock, flags);
>> }
>>
>> -
>> static int au0828_v4l2_open(struct file *filp)
>> {
>> - int ret = 0;
>> - struct video_device *vdev = video_devdata(filp);
>> struct au0828_dev *dev = video_drvdata(filp);
>> - struct au0828_fh *fh;
>> - int type;
>> -
>> - switch (vdev->vfl_type) {
>> - case VFL_TYPE_GRABBER:
>> - type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
>> - break;
>> - case VFL_TYPE_VBI:
>> - type = V4L2_BUF_TYPE_VBI_CAPTURE;
>> - break;
>> - default:
>> - return -EINVAL;
>> - }
>> -
>> - fh = kzalloc(sizeof(struct au0828_fh), GFP_KERNEL);
>> - if (NULL == fh) {
>> - dprintk(1, "Failed allocate au0828_fh struct!\n");
>> - return -ENOMEM;
>> - }
>> + int ret = 0;
>>
> No need to assign it to zero.

Yes. Looks like there are a few other routines that zero out
ret. If you want to see all of those cleaned up, I can do a
separate patch cleaning all these instances. If not I can send
patch v4? Please let me know your preference.

>
>> - fh->type = type;
>> - fh->dev = dev;
>> - v4l2_fh_init(&fh->fh, vdev);
>> - filp->private_data = fh;
>> + dprintk(1,
>> + "%s called std_set %d dev_state %d stream users %d users %d\n",
>> + __func__, dev->std_set_in_tuner_core, dev->dev_state,
>> + dev->streaming_users, dev->users);
>>
>> - if (mutex_lock_interruptible(&dev->lock)) {
>> - kfree(fh);
>> + if (mutex_lock_interruptible(&dev->lock))
>> return -ERESTARTSYS;
>> +
>> + ret = v4l2_fh_open(filp);
>> + if (ret) {
>> + au0828_isocdbg("%s: v4l2_fh_open() returned error %d\n",
>> + __func__, ret);
>> + mutex_unlock(&dev->lock);
>> + return ret;
>> }
>> +
>> if (dev->users == 0) {
>
> you can use v4l2_fh_is_singular_file() and get rid of users member ?

Please see Devin's response on this. I have been debugging the change
I made to use v4l2_fh_is_singular_file() instead of users and seeing
problem with reset stream and couldn't really figure out why until
Devin explained it.

thanks,
-- Shuah

--
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@osg.samsung.com | (970) 217-8978