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Message-ID: <ae494e9e-63da-4644-8653-b29d76021907@xs4all.nl>
Date:   Wed, 18 Oct 2023 12:32:14 +0200
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Subject: Re: [PATCH v12 39/56] media: usb: Stop direct calls to queue
 num_buffers field
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To:     Benjamin Gaignard <benjamin.gaignard@collabora.com>,
        mchehab@kernel.org, tfiga@chromium.org, m.szyprowski@samsung.com,
        ming.qian@nxp.com, ezequiel@vanguardiasur.com.ar,
        p.zabel@pengutronix.de, gregkh@linuxfoundation.org,
        nicolas.dufresne@collabora.com
Cc:     linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org,
        linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev,
        kernel@collabora.com
References: <20231017144756.34719-1-benjamin.gaignard@collabora.com>
 <20231017144756.34719-40-benjamin.gaignard@collabora.com>
From:   Hans Verkuil <hverkuil-cisco@xs4all.nl>
In-Reply-To: <20231017144756.34719-40-benjamin.gaignard@collabora.com>
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Subject line doesn't mention 'airspy:'

Regards,

	Hans

On 17/10/2023 16:47, Benjamin Gaignard wrote:
> 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
> futur.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> ---
>  drivers/media/usb/airspy/airspy.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/airspy/airspy.c b/drivers/media/usb/airspy/airspy.c
> index 462eb8423506..e24e655fb1db 100644
> --- a/drivers/media/usb/airspy/airspy.c
> +++ b/drivers/media/usb/airspy/airspy.c
> @@ -482,12 +482,13 @@ static int airspy_queue_setup(struct vb2_queue *vq,
>  		unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
>  {
>  	struct airspy *s = vb2_get_drv_priv(vq);
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>  
>  	dev_dbg(s->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;
>  	*nplanes = 1;
>  	sizes[0] = PAGE_ALIGN(s->buffersize);
>