netdev - Re: [PATCH RFC 1/2] vsock/virtio: fix kernel panic after device hot-unplug

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Message-ID: <20190102093939.GA24009@stefanha-x1.localdomain>
Date:   Wed, 2 Jan 2019 09:39:39 +0000
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH RFC 1/2] vsock/virtio: fix kernel panic after device
 hot-unplug

On Thu, Dec 20, 2018 at 01:15:34PM +0100, Stefano Garzarella wrote:
> diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
> index 5d3cce9e8744..9dae54698737 100644
> --- a/net/vmw_vsock/virtio_transport.c
> +++ b/net/vmw_vsock/virtio_transport.c
> @@ -75,6 +75,9 @@ static u32 virtio_transport_get_local_cid(void)
>  {
>  	struct virtio_vsock *vsock = virtio_vsock_get();
>  
> +	if (!vsock)
> +		return VMADDR_CID_ANY;
> +
>  	return vsock->guest_cid;
>  }

This looks unrelated to the rest of the patch.  Why is it necessary?

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