net: team: use IFF_NO_ADDRCONF flag to prevent ipv6 addrconf

This patch is to use IFF_NO_ADDRCONF flag to prevent ipv6 addrconf
for Team port. This flag will be set in team_port_enter(), which
is called before dev_open(), and cleared in team_port_leave(),
called after dev_close() and the err path in team_port_add().

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/team/team.c

@@ -1044,6 +1044,7 @@ static int team_port_enter(struct team *team, struct team_port *port)
 			goto err_port_enter;
 		}
 	}
+	port->dev->priv_flags |= IFF_NO_ADDRCONF;
 
 	return 0;
 
@@ -1057,6 +1058,7 @@ static void team_port_leave(struct team *team, struct team_port *port)
 {
 	if (team->ops.port_leave)
 		team->ops.port_leave(team, port);
+	port->dev->priv_flags &= ~IFF_NO_ADDRCONF;
 	dev_put(team->dev);
 }