Another comment:
On Sunday, November 21, 2010 21:32:52 Laurent Pinchart wrote:
> The stream mutex protects access to the struct uvc_streaming ctrl,
> cur_format and cur_frame fields as well as to the hardware probe
> control. Lock it appropriately.
>
> Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> ---
> drivers/media/video/uvc/uvc_v4l2.c | 76
> +++++++++++++++++++++++++----------
> drivers/media/video/uvc/uvc_video.c | 3 -
> drivers/media/video/uvc/uvcvideo.h | 4 +-
> 3 files changed, 57 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/media/video/uvc/uvc_v4l2.c
> b/drivers/media/video/uvc/uvc_v4l2.c
> index 07dd235..b4615e2 100644
> --- a/drivers/media/video/uvc/uvc_v4l2.c
> +++ b/drivers/media/video/uvc/uvc_v4l2.c
> @@ -226,12 +226,14 @@ static int uvc_v4l2_try_format(struct uvc_streaming
> *stream,
> * developers test their webcams with the Linux driver as well as with
> * the Windows driver).
> */
> + mutex_lock(&stream->mutex);
> if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
> probe->dwMaxVideoFrameSize =
> stream->ctrl.dwMaxVideoFrameSize;
>
> /* Probe the device. */
> ret = uvc_probe_video(stream, probe);
> + mutex_unlock(&stream->mutex);
> if (ret < 0)
> goto done;
>
> @@ -255,14 +257,21 @@ done:
> static int uvc_v4l2_get_format(struct uvc_streaming *stream,
> struct v4l2_format *fmt)
> {
> - struct uvc_format *format = stream->cur_format;
> - struct uvc_frame *frame = stream->cur_frame;
> + struct uvc_format *format;
> + struct uvc_frame *frame;
> + int ret = 0;
>
> if (fmt->type != stream->type)
> return -EINVAL;
>
> - if (format == NULL || frame == NULL)
> - return -EINVAL;
> + mutex_lock(&stream->mutex);
> + format = stream->cur_format;
> + frame = stream->cur_frame;
> +
> + if (format == NULL || frame == NULL) {
> + ret = -EINVAL;
ret is set...
> + goto done;
> + }
>
> fmt->fmt.pix.pixelformat = format->fcc;
> fmt->fmt.pix.width = frame->wWidth;
> @@ -273,6 +282,8 @@ static int uvc_v4l2_get_format(struct uvc_streaming
> *stream,
> fmt->fmt.pix.colorspace = format->colorspace;
> fmt->fmt.pix.priv = 0;
>
> +done:
> + mutex_unlock(&stream->mutex);
> return 0;
But not returned?!
> }
<snip>
--
Hans Verkuil - video4linux developer - sponsored by Cisco
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