linux-kernel - Re: [PATCH v11 41/56] media: cedrus: Stop direct calls to queue num

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Message-ID: <e13a2d7b-3288-4899-9469-bf9ea821e35d@collabora.com>
Date:   Tue, 17 Oct 2023 11:59:20 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     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 v11 41/56] media: cedrus: Stop direct calls to queue
 num_buffers field


Le 17/10/2023 à 10:54, Paul Kocialkowski a écrit :
> Hi Benjamin,
>
> On Thu 12 Oct 23, 13:46, Benjamin Gaignard wrote:
>> Use vb2_get_num_buffers() and queue max_num_buffers field
>> to avoid using queue num_buffer field directly.
> Thanks for the patch, this is indeed a nice cleanup and safer usage.
> Maybe the commit message needs to reflect why this change is welcome,
> not just what is being changed.

I will add this comment in the commit message:
This allows us to change how the number of buffers is computed in the futur.

>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>> CC: Maxime Ripard <mripard@...nel.org>
>> CC: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
>> ---
>>   drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 8 ++++++--
>>   drivers/staging/media/sunxi/cedrus/cedrus_h265.c | 9 +++++++--
>>   2 files changed, 13 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..95e490532a87 100644
>> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
>> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
>> @@ -653,8 +653,12 @@ 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;
> Please add a newline here to be consistent with the other block being changed.
>
> With this change and the commit log reworked, you can consider this:
> Acked-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

That will be done for the next version.

Thanks,

Benjamin

>
> Thanks!
>
> Paul
>
>> +		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,
>> -- 
>> 2.39.2
>>