linux-kernel - Re: [PATCH v14 40/56] media: usb: cx231xx: Stop direct calls to queue num

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Message-ID: <43985ffc-ca34-4051-8ae3-1d52c0337918@collabora.com>
Date:   Thu, 9 Nov 2023 12:35:06 +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
Subject: Re: [PATCH v14 40/56] media: usb: cx231xx: Stop direct calls to queue
 num_buffers field

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>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@...labora.com>

> ---
>   drivers/media/usb/cx231xx/cx231xx-417.c   | 5 +++--
>   drivers/media/usb/cx231xx/cx231xx-video.c | 5 +++--
>   2 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/usb/cx231xx/cx231xx-417.c b/drivers/media/usb/cx231xx/cx231xx-417.c
> index fe4410a5e128..45973fe690b2 100644
> --- a/drivers/media/usb/cx231xx/cx231xx-417.c
> +++ b/drivers/media/usb/cx231xx/cx231xx-417.c
> @@ -1218,12 +1218,13 @@ static int queue_setup(struct vb2_queue *vq,
>   {
>   	struct cx231xx *dev = vb2_get_drv_priv(vq);
>   	unsigned int size = mpeglinesize * mpeglines;
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>   
>   	dev->ts1.ts_packet_size  = mpeglinesize;
>   	dev->ts1.ts_packet_count = mpeglines;
>   
> -	if (vq->num_buffers + *nbuffers < CX231XX_MIN_BUF)
> -		*nbuffers = CX231XX_MIN_BUF - vq->num_buffers;
> +	if (q_num_bufs + *nbuffers < CX231XX_MIN_BUF)
> +		*nbuffers = CX231XX_MIN_BUF - q_num_bufs;
>   
>   	if (*nplanes)
>   		return sizes[0] < size ? -EINVAL : 0;
> diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
> index e23b8ccd79d4..c8eb4222319d 100644
> --- a/drivers/media/usb/cx231xx/cx231xx-video.c
> +++ b/drivers/media/usb/cx231xx/cx231xx-video.c
> @@ -714,11 +714,12 @@ static int queue_setup(struct vb2_queue *vq,
>   		       unsigned int sizes[], struct device *alloc_devs[])
>   {
>   	struct cx231xx *dev = vb2_get_drv_priv(vq);
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>   
>   	dev->size = (dev->width * dev->height * dev->format->depth + 7) >> 3;
>   
> -	if (vq->num_buffers + *nbuffers < CX231XX_MIN_BUF)
> -		*nbuffers = CX231XX_MIN_BUF - vq->num_buffers;
> +	if (q_num_bufs + *nbuffers < CX231XX_MIN_BUF)
> +		*nbuffers = CX231XX_MIN_BUF - q_num_bufs;
>   
>   	if (*nplanes)
>   		return sizes[0] < dev->size ? -EINVAL : 0;