[PATCH] media: rkvdec: Fix .buf_prepare
andrzej.p at collabora.com
Wed May 5 12:17:08 UTC 2021
W dniu 04.05.2021 o 13:56, Ezequiel Garcia pisze:
> Hi Andrzej,
> Thanks a lot for picking this up.
> On Tue, 2021-05-04 at 13:37 +0200, Andrzej Pietrasiewicz wrote:
>> From: Ezequiel Garcia <ezequiel at collabora.com>
>> The driver should only set the payload on .buf_prepare if the
>> buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
>> set by userspace then v4l2-core will set it to buffer length.
>> Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
>> Signed-off-by: Ezequiel Garcia <ezequiel at collabora.com>
>> Signed-off-by: Adrian Ratiu <adrian.ratiu at collabora.com>
>> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p at collabora.com>
>> @Hans: I haven't had anyone complain about the issue. The fix is needed for
>> the rkvdec vp9 work, so I think 5.14 is fine.
>> drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
>> 1 file changed, 9 insertions(+), 1 deletion(-)
>> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
>> index d821661d30f3..ef2166043127 100644
>> --- a/drivers/staging/media/rkvdec/rkvdec.c
>> +++ b/drivers/staging/media/rkvdec/rkvdec.c
>> @@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
>> if (vb2_plane_size(vb, i) < sizeimage)
>> return -EINVAL;
>> - vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt.sizeimage);
>> + /*
>> + * Buffer bytesused is written by driver for CAPTURE buffers.
>> + * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
>> + * it to buffer length).
>> + */
>> + if (!V4L2_TYPE_IS_OUTPUT(vq->type))
> Please use V4L2_TYPE_IS_CAPTURE here.
> Also, why is this change needed in rkvdec, but not in cedrus
> or hantro?
As a matter of fact I think it is needed in all three, because later on,
whenever a driver uses vb2_get_plane_payload(), without such a patch it
will get an invalid number and write that to a hardware register, causing
I will respond with a v2 series.
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