linux-kernel - Re: [PATCH v6 5/8] vdpa: min vq num of vdpa device cannot be greater than max vq num

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Message-ID: <CACGkMEsXwYhwaThy=KB3NKa1zU+a5DQuWFLuTkREHMmO0TFpGw@mail.gmail.com>
Date:   Mon, 25 Oct 2021 10:18:26 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Wu Zongyong <wuzongyong@...ux.alibaba.com>
Cc:     virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        mst <mst@...hat.com>, wei.yang1@...ux.alibaba.com
Subject: Re: [PATCH v6 5/8] vdpa: min vq num of vdpa device cannot be greater
 than max vq num

On Fri, Oct 22, 2021 at 10:44 AM Wu Zongyong
<wuzongyong@...ux.alibaba.com> wrote:
>
> Just failed to probe the vdpa device if the min virtqueue num returned
> by get_vq_num_min is greater than the max virtqueue num returned by
> get_vq_num_max.
>
> Signed-off-by: Wu Zongyong <wuzongyong@...ux.alibaba.com>

Acked-by: Jason Wang <jasowang@...hat.com>

> ---
>  drivers/vdpa/vdpa.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 1dc121a07a93..fd014ecec711 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -26,8 +26,16 @@ static int vdpa_dev_probe(struct device *d)
>  {
>         struct vdpa_device *vdev = dev_to_vdpa(d);
>         struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver);
> +       const struct vdpa_config_ops *ops = vdev->config;
> +       u32 max_num, min_num = 0;
>         int ret = 0;
>
> +       max_num = ops->get_vq_num_max(vdev);
> +       if (ops->get_vq_num_min)
> +               min_num = ops->get_vq_num_min(vdev);
> +       if (max_num < min_num)
> +               return -EINVAL;
> +
>         if (drv && drv->probe)
>                 ret = drv->probe(vdev);
>
> --
> 2.31.1
>