netvsc: delay setup of VF device

When VF device is discovered, delay bring it automatically up in
order to allow userspace to some simple changes (like renaming).

Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 98b25f69..a57e376 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -723,7 +723,7 @@ struct net_device_context {
 	/* State to manage the associated VF interface. */
 	struct net_device __rcu *vf_netdev;
 	struct netvsc_vf_pcpu_stats __percpu *vf_stats;
-	struct work_struct vf_takeover;
+	struct delayed_work vf_takeover;
 
 	/* 1: allocated, serial number is valid. 0: not allocated */
 	u32 vf_alloc;