Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index ad9db65..b23fc41 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/export.h>
 #include <linux/kref.h>
 #include <linux/list.h>
@@ -23,7 +24,6 @@
 
 	const struct sfp_upstream_ops *upstream_ops;
 	void *upstream;
-	struct net_device *netdev;
 	struct phy_device *phydev;
 
 	bool registered;
@@ -347,9 +347,10 @@
 				return ret;
 		}
 	}
+	bus->socket_ops->attach(bus->sfp);
 	if (bus->started)
 		bus->socket_ops->start(bus->sfp);
-	bus->netdev->sfp_bus = bus;
+	bus->upstream_ops->attach(bus->upstream, bus);
 	bus->registered = true;
 	return 0;
 }
@@ -358,10 +359,11 @@
 {
 	const struct sfp_upstream_ops *ops = bus->upstream_ops;
 
-	bus->netdev->sfp_bus = NULL;
 	if (bus->registered) {
+		bus->upstream_ops->detach(bus->upstream, bus);
 		if (bus->started)
 			bus->socket_ops->stop(bus->sfp);
+		bus->socket_ops->detach(bus->sfp);
 		if (bus->phydev && ops && ops->disconnect_phy)
 			ops->disconnect_phy(bus->upstream);
 	}
@@ -440,13 +442,11 @@
 {
 	bus->upstream_ops = NULL;
 	bus->upstream = NULL;
-	bus->netdev = NULL;
 }
 
 /**
  * sfp_register_upstream() - Register the neighbouring device
  * @fwnode: firmware node for the SFP bus
- * @ndev: network device associated with the interface
  * @upstream: the upstream private data
  * @ops: the upstream's &struct sfp_upstream_ops
  *
@@ -457,7 +457,7 @@
  * On error, returns %NULL.
  */
 struct sfp_bus *sfp_register_upstream(struct fwnode_handle *fwnode,
-				      struct net_device *ndev, void *upstream,
+				      void *upstream,
 				      const struct sfp_upstream_ops *ops)
 {
 	struct sfp_bus *bus = sfp_bus_get(fwnode);
@@ -467,7 +467,6 @@
 		rtnl_lock();
 		bus->upstream_ops = ops;
 		bus->upstream = upstream;
-		bus->netdev = ndev;
 
 		if (bus->sfp) {
 			ret = sfp_register_bus(bus);
@@ -589,7 +588,7 @@
 		bus->sfp = sfp;
 		bus->socket_ops = ops;
 
-		if (bus->netdev) {
+		if (bus->upstream_ops) {
 			ret = sfp_register_bus(bus);
 			if (ret)
 				sfp_socket_clear(bus);
@@ -609,7 +608,7 @@
 void sfp_unregister_socket(struct sfp_bus *bus)
 {
 	rtnl_lock();
-	if (bus->netdev)
+	if (bus->upstream_ops)
 		sfp_unregister_bus(bus);
 	sfp_socket_clear(bus);
 	rtnl_unlock();