Em Mon, 01 Jun 2009 10:05:04 +0800 "Figo.zhang" <[email protected]> escreveu:
> bttv-driver.c,cx23885-video.c,cx88-video.c: poll method lose race condition > for capture video. > > In v2, use the clear logic.Thanks to Trent Piepho's help. > > Signed-off-by: Figo.zhang <[email protected]> > --- > drivers/media/video/bt8xx/bttv-driver.c | 20 ++++++++++++-------- > drivers/media/video/cx23885/cx23885-video.c | 15 +++++++++++---- > drivers/media/video/cx88/cx88-video.c | 15 +++++++++++---- > 3 files changed, 34 insertions(+), 16 deletions(-) > > diff --git a/drivers/media/video/bt8xx/bttv-driver.c > b/drivers/media/video/bt8xx/bttv-driver.c > index 23b7499..8d20528 100644 > --- a/drivers/media/video/bt8xx/bttv-driver.c > +++ b/drivers/media/video/bt8xx/bttv-driver.c > @@ -3152,6 +3152,7 @@ static unsigned int bttv_poll(struct file *file, > poll_table *wait) > struct bttv_fh *fh = file->private_data; > struct bttv_buffer *buf; > enum v4l2_field field; > + unsigned int rc = POLLERR; > > if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) { > if (!check_alloc_btres(fh->btv,fh,RESOURCE_VBI)) > @@ -3160,9 +3161,10 @@ static unsigned int bttv_poll(struct file *file, > poll_table *wait) > } > > if (check_btres(fh,RESOURCE_VIDEO_STREAM)) { > + mutex_lock(&fh->cap.vb_lock); > /* streaming capture */ > if (list_empty(&fh->cap.stream)) > - return POLLERR; > + return done; Here, you're keeping the mutex locked. Maybe you wanted to do a "goto done" ? > buf = list_entry(fh->cap.stream.next,struct > bttv_buffer,vb.stream); > } else { > /* read() capture */ > @@ -3170,16 +3172,16 @@ static unsigned int bttv_poll(struct file *file, > poll_table *wait) > if (NULL == fh->cap.read_buf) { > /* need to capture a new frame */ > if (locked_btres(fh->btv,RESOURCE_VIDEO_STREAM)) > - goto err; > + goto done; > fh->cap.read_buf = videobuf_sg_alloc(fh->cap.msize); > if (NULL == fh->cap.read_buf) > - goto err; > + goto done; > fh->cap.read_buf->memory = V4L2_MEMORY_USERPTR; > field = videobuf_next_field(&fh->cap); > if (0 != > fh->cap.ops->buf_prepare(&fh->cap,fh->cap.read_buf,field)) { > kfree (fh->cap.read_buf); > fh->cap.read_buf = NULL; > - goto err; > + goto done; > } > fh->cap.ops->buf_queue(&fh->cap,fh->cap.read_buf); > fh->cap.read_off = 0; > @@ -3191,11 +3193,13 @@ static unsigned int bttv_poll(struct file *file, > poll_table *wait) > poll_wait(file, &buf->vb.done, wait); > if (buf->vb.state == VIDEOBUF_DONE || > buf->vb.state == VIDEOBUF_ERROR) > - return POLLIN|POLLRDNORM; > - return 0; > -err: > + rc = POLLIN|POLLRDNORM; > + else > + rc = 0; > + > +done: > mutex_unlock(&fh->cap.vb_lock); > - return POLLERR; > + return rc; > } > > static int bttv_open(struct file *file) > diff --git a/drivers/media/video/cx23885/cx23885-video.c > b/drivers/media/video/cx23885/cx23885-video.c > index 68068c6..f542493 100644 > --- a/drivers/media/video/cx23885/cx23885-video.c > +++ b/drivers/media/video/cx23885/cx23885-video.c > @@ -796,6 +796,7 @@ static unsigned int video_poll(struct file *file, > { > struct cx23885_fh *fh = file->private_data; > struct cx23885_buffer *buf; > + unsigned int rc = POLLERR; > > if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) { > if (!res_get(fh->dev, fh, RESOURCE_VBI)) > @@ -803,23 +804,29 @@ static unsigned int video_poll(struct file *file, > return videobuf_poll_stream(file, &fh->vbiq, wait); > } > > + mutex_lock(&fh->vidq.vb_lock); > if (res_check(fh, RESOURCE_VIDEO)) { > /* streaming capture */ > if (list_empty(&fh->vidq.stream)) > - return POLLERR; > + goto done; > buf = list_entry(fh->vidq.stream.next, > struct cx23885_buffer, vb.stream); > } else { > /* read() capture */ > buf = (struct cx23885_buffer *)fh->vidq.read_buf; > if (NULL == buf) > - return POLLERR; > + goto done; > } > poll_wait(file, &buf->vb.done, wait); > if (buf->vb.state == VIDEOBUF_DONE || > buf->vb.state == VIDEOBUF_ERROR) > - return POLLIN|POLLRDNORM; > - return 0; > + rc = POLLIN|POLLRDNORM; > + else > + rc = 0; > + > +done: > + mutex_unlock(&fh->vidq.vb_lock); > + return rc; > } > > static int video_release(struct file *file) > diff --git a/drivers/media/video/cx88/cx88-video.c > b/drivers/media/video/cx88/cx88-video.c > index b993d42..b1ca54b 100644 > --- a/drivers/media/video/cx88/cx88-video.c > +++ b/drivers/media/video/cx88/cx88-video.c > @@ -869,6 +869,7 @@ video_poll(struct file *file, struct poll_table_struct > *wait) > { > struct cx8800_fh *fh = file->private_data; > struct cx88_buffer *buf; > + unsigned int rc = POLLERR; > > if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) { > if (!res_get(fh->dev,fh,RESOURCE_VBI)) > @@ -876,22 +877,28 @@ video_poll(struct file *file, struct poll_table_struct > *wait) > return videobuf_poll_stream(file, &fh->vbiq, wait); > } > > + mutex_lock(&fh->vidq.vb_lock); > if (res_check(fh,RESOURCE_VIDEO)) { > /* streaming capture */ > if (list_empty(&fh->vidq.stream)) > - return POLLERR; > + goto done; > buf = list_entry(fh->vidq.stream.next,struct > cx88_buffer,vb.stream); > } else { > /* read() capture */ > buf = (struct cx88_buffer*)fh->vidq.read_buf; > if (NULL == buf) > - return POLLERR; > + goto done; > } > poll_wait(file, &buf->vb.done, wait); > if (buf->vb.state == VIDEOBUF_DONE || > buf->vb.state == VIDEOBUF_ERROR) > - return POLLIN|POLLRDNORM; > - return 0; > + rc = POLLIN|POLLRDNORM; > + else > + rc = 0; > + > +done: > + mutex_unlock(&fh->vidq.vb_lock); > + return rc; > } > > static int video_release(struct file *file) > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Cheers, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
