linux-kernel - Re: [PATCH v14 25/56] media: pci: tw68: Stop direct calls to queue num

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Message-ID: <92b6faac-6f74-4949-a8db-45defb02df7b@collabora.com>
Date:   Thu, 9 Nov 2023 11:23:27 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     Andrzej Pietrasiewicz <andrzej.p@...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,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Subject: Re: [PATCH v14 25/56] media: pci: tw68: Stop direct calls to queue
 num_buffers field


Le 09/11/2023 à 11:13, Andrzej Pietrasiewicz a écrit :
> Hi Benjamin,
>
> 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>
>> CC: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
>> ---
>>   drivers/media/pci/tw68/tw68-video.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/media/pci/tw68/tw68-video.c 
>> b/drivers/media/pci/tw68/tw68-video.c
>> index 773a18702d36..35296c226019 100644
>> --- a/drivers/media/pci/tw68/tw68-video.c
>> +++ b/drivers/media/pci/tw68/tw68-video.c
>> @@ -360,13 +360,13 @@ static int tw68_queue_setup(struct vb2_queue *q,
>>                  unsigned int sizes[], struct device *alloc_devs[])
>>   {
>>       struct tw68_dev *dev = vb2_get_drv_priv(q);
>
> Why not
>
>     unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>
> just like in other patches in the series?

You are right, I will change it to keep the same pattern than for the other patches.

Regards,
Benjamin

>
> Regards,
>
> Andrzej
>
>> -    unsigned tot_bufs = q->num_buffers + *num_buffers;
>> +    unsigned tot_bufs = vb2_get_num_buffers(q) + *num_buffers;
>>       unsigned size = (dev->fmt->depth * dev->width * dev->height) >> 3;
>>         if (tot_bufs < 2)
>>           tot_bufs = 2;
>>       tot_bufs = tw68_buffer_count(size, tot_bufs);
>> -    *num_buffers = tot_bufs - q->num_buffers;
>> +    *num_buffers = tot_bufs - vb2_get_num_buffers(q);
>>       /*
>>        * We allow create_bufs, but only if the sizeimage is >= as the
>>        * current sizeimage. The tw68_buffer_count calculation becomes 
>> quite
>
>