netdev - Re: [PATCH] vdpa: Avoid duplicate call to vp_vdpa get

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Date:   Fri, 5 Nov 2021 10:48:37 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eugenio Pérez <eperezma@...hat.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>, kvm <kvm@...r.kernel.org>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] vdpa: Avoid duplicate call to vp_vdpa get_status

On Fri, Nov 5, 2021 at 3:58 AM Eugenio Pérez <eperezma@...hat.com> wrote:
>
> It has no sense to call get_status twice, since we already have a
> variable for that.
>
> Signed-off-by: Eugenio Pérez <eperezma@...hat.com>

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

> ---
>  drivers/vhost/vdpa.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index 01c59ce7e250..10676ea0348b 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -167,13 +167,13 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
>         status_old = ops->get_status(vdpa);
>
>         /*
>          * Userspace shouldn't remove status bits unless reset the
>          * status to 0.
>          */
> -       if (status != 0 && (ops->get_status(vdpa) & ~status) != 0)
> +       if (status != 0 && (status_old & ~status) != 0)
>                 return -EINVAL;
>
>         if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
>                 for (i = 0; i < nvqs; i++)
>                         vhost_vdpa_unsetup_vq_irq(v, i);
>
> --
> 2.27.0
>