Re: [PATCH v14 35/56] media: cedrus: Stop direct calls to queue num_buffers field

Paul Kocialkowski
2023-11-09T14:14:48Z

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Hi Andrej,

On Thu 09 Nov 23, 12:27, Andrzej Pietrasiewicz wrote:
> Hi Paul,
>
> W dniu 31.10.2023 o 17:30, Benjamin Gaignard pisze:
> > Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
> > This allows us to change how the number of buffers is computed in the
> > future.
> >
> > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> > Acked-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
>
> Given you've alaredy A-b, would you be ok with adding this sentence:
>
> "While at it, check the return value of vb2_get_buffer()."
>
> to the commit message body?

Not only do I agree, but because this is done in a function returning void,
you could even:

if (WARN_ON(!vb))
continue;

so that it doesn't go completely unnoticed.

What do you think?

Cheers,

Paul

> @Benjamin:
>
> With this change, you can add my
>
> Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
>
> > CC: Maxime Ripard <mripard@kernel.org>
> > ---
> > drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 9 +++++++--
> > drivers/staging/media/sunxi/cedrus/cedrus_h265.c | 9 +++++++--
> > 2 files changed, 14 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > index dfb401df138a..3e2843ef6cce 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > @@ -653,8 +653,13 @@ static void cedrus_h264_stop(struct cedrus_ctx *ctx)
> > vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
> > - for (i = 0; i < vq->num_buffers; i++) {
> > - buf = vb2_to_cedrus_buffer(vb2_get_buffer(vq, i));
> > + for (i = 0; i < vb2_get_num_buffers(vq); i++) {
> > + struct vb2_buffer *vb = vb2_get_buffer(vq, i);
> > +
> > + if (!vb)
> > + continue;
> > +
> > + buf = vb2_to_cedrus_buffer(vb);
> > if (buf->codec.h264.mv_col_buf_size > 0) {
> > dma_free_attrs(dev->dev,
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> > index fc9297232456..52e94c8f2f01 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> > @@ -869,8 +869,13 @@ static void cedrus_h265_stop(struct cedrus_ctx *ctx)
> > vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
> > - for (i = 0; i < vq->num_buffers; i++) {
> > - buf = vb2_to_cedrus_buffer(vb2_get_buffer(vq, i));
> > + for (i = 0; i < vb2_get_num_buffers(vq); i++) {
> > + struct vb2_buffer *vb = vb2_get_buffer(vq, i);
> > +
> > + if (!vb)
> > + continue;
> > +
> > + buf = vb2_to_cedrus_buffer(vb);
> > if (buf->codec.h265.mv_col_buf_size > 0) {
> > dma_free_attrs(dev->dev,
>

--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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