linux-kernel - Re: [PATCH v14 35/56] media: cedrus: Stop direct calls to queue num

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Date:   Thu, 9 Nov 2023 15:14:33 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Andrzej Pietrasiewicz <andrzej.p@...labora.com>
Cc:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, nicolas.dufresne@...labora.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com, Maxime Ripard <mripard@...nel.org>
Subject: Re: [PATCH v14 35/56] media: cedrus: Stop direct calls to queue
 num_buffers field

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@...labora.com>
> > Acked-by: Paul Kocialkowski <paul.kocialkowski@...tlin.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@...labora.com>
> 
> > CC: Maxime Ripard <mripard@...nel.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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