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

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Date:   Fri, 20 Oct 2023 17:28:48 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     Su Hui <suhui@...china.com>
Cc:     Su Hui <suhui@...china.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        mst@...hat.com, jasowang@...hat.com
Subject: Re: [PATCH] virtio_ring: add an error code check in virtqueue_resize

If any error happens, this function should restore to the old status.

So, whether the err is true, we should goto the virtqueue_enable_after_reset().

If the err is true, that mean the resize new quuee failed, but the queue
status has restored to the old status.

We should ignore the return value of the virtuqueue_resize_xxx().

Do you find other error in the virtuqueue_resize_xxx().

Thanks.


On Fri, 20 Oct 2023 17:23:21 +0800, Su Hui <suhui@...china.com> wrote:
> virtqueue_resize_packed() or virtqueue_resize_split() can return
> error code if failed, so add a check for this.
>
> Signed-off-by: Su Hui <suhui@...china.com>
> ---
>
> I'm not sure that return directly is right or not,
> maybe there are some process should do before return.
>
>  drivers/virtio/virtio_ring.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 51d8f3299c10..cf662c3a755b 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -2759,6 +2759,9 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
>  	else
>  		err = virtqueue_resize_split(_vq, num);
>
> +	if (err)
> +		return err;
> +
>  	return virtqueue_enable_after_reset(_vq);
>  }
>  EXPORT_SYMBOL_GPL(virtqueue_resize);
> --
> 2.30.2
>