hv_netvsc: init completion during alloc

BugLink: http://bugs.launchpad.net/bugs/1650059

Move initialization to allocate where other fields are initialized.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit fd612602)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

drivers/net/hyperv/netvsc.c

@@ -164,6 +164,7 @@ static struct netvsc_device *alloc_net_device(void)
 	atomic_set(&net_device->open_cnt, 0);
 	net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
 	net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
+	init_completion(&net_device->channel_init_wait);
 
 	return net_device;
 }
@@ -1442,9 +1443,6 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
 
 	net_device->ring_size = ring_size;
 
-	/* Initialize the NetVSC channel extension */
-	init_completion(&net_device->channel_init_wait);
-
 	set_per_channel_state(device->channel, net_device->cb_buffer);
 
 	/* Open the channel */