linux-kernel - Re: [Xen-devel] [PATCH] xen-netfront: enable device after manual module load

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Date:   Mon, 8 Jan 2018 10:03:55 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Eduardo Otubo <otubo@...hat.com>, linux-kernel@...r.kernel.org
Cc:     jgross@...e.com, netdev@...r.kernel.org,
        xen-devel@...ts.xenproject.org, mgamal@...hat.com,
        cavery@...hat.com, vkuznets@...hat.com
Subject: Re: [Xen-devel] [PATCH] xen-netfront: enable device after manual
 module load

On 01/05/2018 03:42 AM, Eduardo Otubo wrote:
> When loading the module after unloading it, the network interface would
> not be enabled and thus wouldn't have a backend counterpart and unable
> to be used by the guest.
>
> The guest would face errors like:
>
>   [root@...st ~]# ethtool -i eth0
>   Cannot get driver information: No such device
>
>   [root@...st ~]# ifconfig eth0
>   eth0: error fetching interface information: Device not found
>
> This patch initializes the state of the netfront device whenever it is
> loaded manually, this state would communicate the netback to create its
> device and establish the connection between them.
>
> Signed-off-by: Eduardo Otubo <otubo@...hat.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

Should this go to stable trees as well?

-boris

> ---
>  drivers/net/xen-netfront.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index c5a34671abda..9bd7ddeeb6a5 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -1326,6 +1326,7 @@ static struct net_device *xennet_create_dev(struct xenbus_device *dev)
>  
>  	netif_carrier_off(netdev);
>  
> +	xenbus_switch_state(dev, XenbusStateInitialising);
>  	return netdev;
>  
>   exit: