net: thunderbolt: Unregister ThunderboltIP protocol handler when suspending

[ Upstream commit 9872760e ]

The XDomain protocol messages may start as soon as Thunderbolt control
channel is started. This means that if the other host starts sending
ThunderboltIP packets early enough they will be passed to the network
driver which then gets confused because its resume hook is not called
yet.

Fix this by unregistering the ThunderboltIP protocol handler when
suspending and registering it back on resume.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/thunderbolt.c

@@ -1282,6 +1282,7 @@ static int __maybe_unused tbnet_suspend(struct device *dev)
 		tbnet_tear_down(net, true);
 	}
 
+	tb_unregister_protocol_handler(&net->handler);
 	return 0;
 }
 
@@ -1290,6 +1291,8 @@ static int __maybe_unused tbnet_resume(struct device *dev)
 	struct tb_service *svc = tb_to_service(dev);
 	struct tbnet *net = tb_service_get_drvdata(svc);
 
+	tb_register_protocol_handler(&net->handler);
+
 	netif_carrier_off(net->dev);
 	if (netif_running(net->dev)) {
 		netif_device_attach(net->dev);