linux-kernel - Re: [PATCH v7 22/49] media: i2c: Stop direct calls to queue num

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Date:   Tue, 19 Sep 2023 15:42:00 +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 22/49] media: i2c: 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/i2c/video-i2c.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
> index 537ebd9fa8d7..60d3e2f35afe 100644
> --- a/drivers/media/i2c/video-i2c.c
> +++ b/drivers/media/i2c/video-i2c.c
> @@ -406,7 +406,7 @@ static int queue_setup(struct vb2_queue *vq,
>  	struct video_i2c_data *data = vb2_get_drv_priv(vq);
>  	unsigned int size = data->chip->buffer_size;
>  
> -	if (vq->num_buffers + *nbuffers < 2)
> +	if (vb2_get_num_buffers(vq) + *nbuffers < 2)
>  		*nbuffers = 2;
>  
>  	if (*nplanes)

This driver sets min_buffers_needed to 1, then checks for 2 here.

Drop the check and instead set min_buffers_needed to 2.

Update the commit log accordingly.

Regards,

	Hans