linux-kernel - Re: [PATCH v7 23/49] media: pci: cx18: Stop direct calls to queue num

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Date:   Tue, 19 Sep 2023 15:42:57 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
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,
        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 v7 23/49] media: pci: cx18: Stop direct calls to queue
 num_buffers field

On 14/09/2023 15:32, Benjamin Gaignard wrote:
> Use vb2_get_num_buffers() to avoid using queue num_buffer field directly.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
>  drivers/media/pci/cx18/cx18-streams.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/pci/cx18/cx18-streams.c b/drivers/media/pci/cx18/cx18-streams.c
> index 597472754c4c..a7a7e006b3be 100644
> --- a/drivers/media/pci/cx18/cx18-streams.c
> +++ b/drivers/media/pci/cx18/cx18-streams.c
> @@ -105,6 +105,7 @@ static int cx18_queue_setup(struct vb2_queue *vq,
>  			    unsigned int sizes[], struct device *alloc_devs[])
>  {
>  	struct cx18_stream *s = vb2_get_drv_priv(vq);
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>  	struct cx18 *cx = s->cx;
>  	unsigned int szimage;
>  
> @@ -121,8 +122,8 @@ static int cx18_queue_setup(struct vb2_queue *vq,
>  	 * Let's request at least three buffers: two for the
>  	 * DMA engine and one for userspace.
>  	 */
> -	if (vq->num_buffers + *nbuffers < 3)
> -		*nbuffers = 3 - vq->num_buffers;
> +	if (q_num_bufs + *nbuffers < 3)
> +		*nbuffers = 3 - q_num_bufs;

>From what I can see, this driver already sets min_buffers_needed to 3,
so this check can just be dropped.

	Hans

>  
>  	if (*nplanes) {
>  		if (*nplanes != 1 || sizes[0] < szimage)