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

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Date:   Fri,  5 Jan 2018 09:42:16 +0100
From:   Eduardo Otubo <otubo@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     netdev@...r.kernel.org, xen-devel@...ts.xenproject.org,
        jgross@...e.com, boris.ostrovsky@...cle.com, vkuznets@...hat.com,
        mgamal@...hat.com, cavery@...hat.com
Subject: [PATCH] xen-netfront: enable device after manual module load

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>
---
 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:
-- 
2.14.3