netdev - Re: [PATCH v11 05/12] vhost-vdpa: Handle the failure of vdpa

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Date:   Mon, 23 Aug 2021 14:32:04 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xie Yongji <xieyongji@...edance.com>, mst@...hat.com,
        stefanha@...hat.com, sgarzare@...hat.com, parav@...dia.com,
        hch@...radead.org, christian.brauner@...onical.com,
        rdunlap@...radead.org, willy@...radead.org,
        viro@...iv.linux.org.uk, axboe@...nel.dk, bcrl@...ck.org,
        corbet@....net, mika.penttila@...tfour.com,
        dan.carpenter@...cle.com, joro@...tes.org,
        gregkh@...uxfoundation.org, zhe.he@...driver.com,
        xiaodong.liu@...el.com, joe@...ches.com, robin.murphy@....com
Cc:     songmuchun@...edance.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 05/12] vhost-vdpa: Handle the failure of vdpa_reset()


在 2021/8/18 下午8:06, Xie Yongji 写道:
> The vdpa_reset() may fail now. This adds check to its return
> value and fail the vhost_vdpa_open().
>
> Signed-off-by: Xie Yongji <xieyongji@...edance.com>


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


> ---
>   drivers/vhost/vdpa.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index b1c91b4db0ba..d99d75ad30cc 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -116,12 +116,13 @@ static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid)
>   	irq_bypass_unregister_producer(&vq->call_ctx.producer);
>   }
>   
> -static void vhost_vdpa_reset(struct vhost_vdpa *v)
> +static int vhost_vdpa_reset(struct vhost_vdpa *v)
>   {
>   	struct vdpa_device *vdpa = v->vdpa;
>   
> -	vdpa_reset(vdpa);
>   	v->in_batch = 0;
> +
> +	return vdpa_reset(vdpa);
>   }
>   
>   static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp)
> @@ -868,7 +869,9 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep)
>   		return -EBUSY;
>   
>   	nvqs = v->nvqs;
> -	vhost_vdpa_reset(v);
> +	r = vhost_vdpa_reset(v);
> +	if (r)
> +		goto err;
>   
>   	vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL);
>   	if (!vqs) {