This is a note to let you know that I've just added the patch titled

xen-netfront: enable device after manual module load

to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: xen-netfront-enable-device-after-manual-module-load.patch and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Feb 28 16:19:30 CET 2018

From: Eduardo Otubo otubo@redhat.com Date: Fri, 5 Jan 2018 09:42:16 +0100 Subject: xen-netfront: enable device after manual module load

From: Eduardo Otubo otubo@redhat.com

[ Upstream commit b707fda2df4070785d0fa8a278aa13944c5f51f8 ]

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@guest ~]# ethtool -i eth0 Cannot get driver information: No such device

[root@guest ~]# 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@redhat.com Reviewed-by: Boris Ostrovsky boris.ostrovsky@oracle.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/xen-netfront.c | 1 + 1 file changed, 1 insertion(+)

--- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -1331,6 +1331,7 @@ static struct net_device *xennet_create_

netif_carrier_off(netdev);

+ xenbus_switch_state(dev, XenbusStateInitialising); return netdev;

exit:

Patches currently in stable-queue which might be from otubo@redhat.com are

queue-4.4/xen-netfront-enable-device-after-manual-module-load.patch