linux-kernel - Re: [PATCH v7 39/49] media: usb: hackrf: Stop direct calls to queue num

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Date:   Tue, 19 Sep 2023 16:20:10 +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 39/49] media: usb: hackrf: Stop direct calls to queue
 num_buffers field

On 14/09/2023 15:33, 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/usb/hackrf/hackrf.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/hackrf/hackrf.c b/drivers/media/usb/hackrf/hackrf.c
> index 3e535be2c520..9c0ecd5f056c 100644
> --- a/drivers/media/usb/hackrf/hackrf.c
> +++ b/drivers/media/usb/hackrf/hackrf.c
> @@ -753,12 +753,13 @@ static int hackrf_queue_setup(struct vb2_queue *vq,
>  		unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
>  {
>  	struct hackrf_dev *dev = vb2_get_drv_priv(vq);
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>  
>  	dev_dbg(dev->dev, "nbuffers=%d\n", *nbuffers);
>  
>  	/* Need at least 8 buffers */
> -	if (vq->num_buffers + *nbuffers < 8)
> -		*nbuffers = 8 - vq->num_buffers;
> +	if (q_num_bufs + *nbuffers < 8)
> +		*nbuffers = 8 - q_num_bufs;

Drop check, set min_buffers_needed to 8.

Regards,

	Hans

>  	*nplanes = 1;
>  	sizes[0] = PAGE_ALIGN(dev->buffersize);
>