linux-kernel - Re: [PATCH] vduse: Cleanup the old kernel states after reset failure

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Date:   Tue, 7 Sep 2021 11:33:45 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xie Yongji <xieyongji@...edance.com>
Cc:     mst <mst@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vduse: Cleanup the old kernel states after reset failure

On Mon, Sep 6, 2021 at 10:22 PM Xie Yongji <xieyongji@...edance.com> wrote:
>
> We should cleanup the old kernel states e.g. interrupt callback
> no matter whether the userspace handle the reset correctly or not
> since virtio-vdpa can't handle the reset failure now.
>
> Otherwise, the old state might be used after reset which might
> break something, e.g. the old interrupt callback might be triggered
> by userspace after reset, which can break the virtio device driver.
>
> Signed-off-by: Xie Yongji <xieyongji@...edance.com>
> ---
>  drivers/vdpa/vdpa_user/vduse_dev.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 59a93e5b967a..61695521066c 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -665,13 +665,11 @@ static void vduse_vdpa_set_config(struct vdpa_device *vdpa, unsigned int offset,
>  static int vduse_vdpa_reset(struct vdpa_device *vdpa)
>  {
>         struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> -
> -       if (vduse_dev_set_status(dev, 0))
> -               return -EIO;
> +       int ret = vduse_dev_set_status(dev, 0);
>
>         vduse_dev_reset(dev);
>
> -       return 0;
> +       return ret;
>  }
>
>  static u32 vduse_vdpa_get_generation(struct vdpa_device *vdpa)
> --
> 2.11.0
>

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