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

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Message-ID: <083e43d9-452a-4b11-b7f1-f75992bc795e@collabora.com>
Date:   Thu, 9 Nov 2023 12:27:11 +0100
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     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
Cc:     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,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Maxime Ripard <mripard@...nel.org>
Subject: Re: [PATCH v14 35/56] media: cedrus: Stop direct calls to queue
 num_buffers field

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?

@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,