linux-kernel - Re: [PATCH] virtio_ring: add an error code check in virtqueue

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Message-ID: <1698029596.5404413-3-xuanzhuo@linux.alibaba.com>
Date:   Mon, 23 Oct 2023 10:53:16 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     Su Hui <suhui@...china.com>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH] virtio_ring: add an error code check in virtqueue_resize

On Mon, 23 Oct 2023 10:51:59 +0800, Su Hui <suhui@...china.com> wrote:
> On 2023/10/23 10:26, Xuan Zhuo wrote:
> >>>> Well, what are the cases where it can happen practically?
> >>> Device error. Such as vp_active_vq()
> >>>
> >>> Thanks.
> >> Hmm interesting. OK. But do callers know to recover?
> >
> > No.
> >
> > So I think WARN + broken is suitable.
> >
> > Thanks.
> Sorry for the late, is the following code okay?
>
> @@ -2739,7 +2739,7 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
>                       void (*recycle)(struct virtqueue *vq, void *buf))
>   {
>          struct vring_virtqueue *vq = to_vvq(_vq);
> -       int err;
> +       int err, err_reset;
>
>          if (num > vq->vq.num_max)
>                  return -E2BIG;
> @@ -2759,7 +2759,15 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
>          else
>                  err = virtqueue_resize_split(_vq, num);
>
> -       return virtqueue_enable_after_reset(_vq);
> +       err_reset = virtqueue_enable_after_reset(_vq);
> +
> +       if (err) {

No err.

err is not important.
You can remove that.

Thanks.


> +               vq->broken = true;
> +               WARN_ON(err_reset);
> +               return err;
> +       }
> +
> +       return err_reset;
>   }
>
> Thanks.
> Su Hui
>