On 02/20/2015 05:38 PM, Kamil Debski wrote:
> The coda driver interprets a buffer with bytesused equal to 0 as a special
> case indicating end-of-stream. After vb2: fix bytesused == 0 handling
> (8a75ffb) patch videobuf2 modified the value of bytesused if it was 0.
> The allow_zero_bytesused flag was added to videobuf2 to keep
> backward compatibility.
>
> Signed-off-by: Kamil Debski <[email protected]>
> ---
> drivers/media/platform/coda/coda-common.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/media/platform/coda/coda-common.c
> b/drivers/media/platform/coda/coda-common.c
> index 6f32e6d..2d23f9a 100644
> --- a/drivers/media/platform/coda/coda-common.c
> +++ b/drivers/media/platform/coda/coda-common.c
> @@ -1541,6 +1541,13 @@ static int coda_queue_init(struct coda_ctx *ctx,
> struct vb2_queue *vq)
> vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
> vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> vq->lock = &ctx->dev->dev_mutex;
> + /* One of means to indicate end-of-stream for coda is to set the
s/One of means/One way/
> + * bytesused == 0. However by default videobuf2 handles videobuf
s/videobuf/bytesused/
> + * equal to 0 as a special case and changes its value to the size
> + * of the buffer. Set the allow_zero_bytesused flag, so
> + * that videobuf2 will keep the value of bytesused intact.
> + */
> + vq->allow_zero_bytesused = 1;
>
> return vb2_queue_init(vq);
> }
>
Regards,
Hans
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