net: init perm_addr in register_netdevice()

Benefit from the fact that dev->addr_assign_type is set to NET_ADDR_PERM
in case the device has permanent address.

This also fixes the problem that many drivers do not set perm_addr at
all.
Signed-off-by: NJiri Pirko <jiri@resnulli.us>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -6004,6 +6004,13 @@ int register_netdevice(struct net_device *dev)
 	list_netdevice(dev);
 	add_device_randomness(dev->dev_addr, dev->addr_len);
 
+	/* If the device has permanent device address, driver should
+	 * set dev_addr and also addr_assign_type should be set to
+	 * NET_ADDR_PERM (default value).
+	 */
+	if (dev->addr_assign_type == NET_ADDR_PERM)
+		memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
+
 	/* Notify protocols, that a new device appeared. */
 	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
 	ret = notifier_to_errno(ret);