net: thunderbolt: Unregister ThunderboltIP protocol handler when suspending

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>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/thunderbolt.c b/drivers/net/thunderbolt.c
index c48c3a1eb1f8..fcf31335a8b6 100644
--- a/drivers/net/thunderbolt.c
+++ b/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);