Patch "xen-netfront: enable device after manual module load" has been added to the 4.4-stable tree

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;a=summary

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 <[email protected]> know about it.

From: Eduardo Otubo <[email protected]>
Date: Fri, 5 Jan 2018 09:42:16 +0100
Subject: xen-netfront: enable device after manual module load

From: Eduardo Otubo <[email protected]>

[ 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.

---
 drivers/net/xen-netfront.c |    1 +
 1 file changed, 1 insertion(+)

@@ -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 [email protected] are

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