net: ibm: emac: remove mii_bus with devm

Switching to devm management of mii_bus allows to remove
mdiobus_unregister calls and thus avoids needing a mii_bus global struct
member.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20240912024903.6201-5-rosenp@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ibm/emac/core.c

@@ -2581,6 +2581,7 @@ static const struct mii_phy_ops emac_dt_mdio_phy_ops = {
 static int emac_dt_mdio_probe(struct emac_instance *dev)
 {
 	struct device_node *mii_np;
+	struct mii_bus *bus;
 	int res;
 
 	mii_np = of_get_child_by_name(dev->ofdev->dev.of_node, "mdio");
@@ -2594,23 +2595,23 @@ static int emac_dt_mdio_probe(struct emac_instance *dev)
 		goto put_node;
 	}
 
-	dev->mii_bus = devm_mdiobus_alloc(&dev->ofdev->dev);
-	if (!dev->mii_bus) {
+	bus = devm_mdiobus_alloc(&dev->ofdev->dev);
+	if (!bus) {
 		res = -ENOMEM;
 		goto put_node;
 	}
 
-	dev->mii_bus->priv = dev->ndev;
-	dev->mii_bus->parent = dev->ndev->dev.parent;
-	dev->mii_bus->name = "emac_mdio";
-	dev->mii_bus->read = &emac_mii_bus_read;
-	dev->mii_bus->write = &emac_mii_bus_write;
-	dev->mii_bus->reset = &emac_mii_bus_reset;
-	snprintf(dev->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev->ofdev->name);
-	res = of_mdiobus_register(dev->mii_bus, mii_np);
+	bus->priv = dev->ndev;
+	bus->parent = dev->ndev->dev.parent;
+	bus->name = "emac_mdio";
+	bus->read = &emac_mii_bus_read;
+	bus->write = &emac_mii_bus_write;
+	bus->reset = &emac_mii_bus_reset;
+	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", dev->ofdev->name);
+	res = devm_of_mdiobus_register(&dev->ofdev->dev, bus, mii_np);
 	if (res) {
 		dev_err(&dev->ofdev->dev, "cannot register MDIO bus %s (%d)",
-			dev->mii_bus->name, res);
+			bus->name, res);
 	}
 
  put_node:
@@ -2656,8 +2657,6 @@ static int emac_dt_phy_probe(struct emac_instance *dev)
 		res = emac_dt_mdio_probe(dev);
 		if (!res) {
 			res = emac_dt_phy_connect(dev, phy_handle);
-			if (res)
-				mdiobus_unregister(dev->mii_bus);
 		}
 	}
 
@@ -2697,10 +2696,8 @@ static int emac_init_phy(struct emac_instance *dev)
 
 			res = of_phy_register_fixed_link(np);
 			dev->phy_dev = of_phy_find_device(np);
-			if (res || !dev->phy_dev) {
-				mdiobus_unregister(dev->mii_bus);
+			if (res || !dev->phy_dev)
 				return res ? res : -EINVAL;
-			}
 			emac_adjust_link(dev->ndev);
 			put_device(&dev->phy_dev->mdio.dev);
 		}
@@ -3265,9 +3262,6 @@ static void emac_remove(struct platform_device *ofdev)
 	if (dev->phy_dev)
 		phy_disconnect(dev->phy_dev);
 
-	if (dev->mii_bus)
-		mdiobus_unregister(dev->mii_bus);
-
 	busy_phy_map &= ~(1 << dev->phy.address);
 	DBG(dev, "busy_phy_map now %#x" NL, busy_phy_map);
 

drivers/net/ethernet/ibm/emac/core.h

@@ -189,7 +189,6 @@ struct emac_instance {
 	struct mutex			mdio_lock;
 
 	/* Device-tree based phy configuration */
-	struct mii_bus			*mii_bus;
 	struct phy_device		*phy_dev;
 
 	/* ZMII infos if any */