net: stmmac: use xpcs_create_mdiodev()

Use the new xpcs_create_mdiodev() creator, which simplifies the
creation and destruction of the mdio device associated with xpcs.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c

@@ -491,7 +491,6 @@ int stmmac_mdio_reset(struct mii_bus *bus)
 int stmmac_xpcs_setup(struct mii_bus *bus)
 {
 	struct net_device *ndev = bus->priv;
-	struct mdio_device *mdiodev;
 	struct stmmac_priv *priv;
 	struct dw_xpcs *xpcs;
 	int mode, addr;
@@ -501,16 +500,10 @@ int stmmac_xpcs_setup(struct mii_bus *bus)
 
 	/* Try to probe the XPCS by scanning all addresses. */
 	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
-		mdiodev = mdio_device_create(bus, addr);
-		if (IS_ERR(mdiodev))
+		xpcs = xpcs_create_mdiodev(bus, addr, mode);
+		if (IS_ERR(xpcs))
 			continue;
 
-		xpcs = xpcs_create(mdiodev, mode);
-		if (IS_ERR_OR_NULL(xpcs)) {
-			mdio_device_free(mdiodev);
-			continue;
-		}
-
 		priv->hw->xpcs = xpcs;
 		break;
 	}
@@ -669,10 +662,8 @@ int stmmac_mdio_unregister(struct net_device *ndev)
 	if (!priv->mii)
 		return 0;
 
-	if (priv->hw->xpcs) {
-		mdio_device_free(priv->hw->xpcs->mdiodev);
+	if (priv->hw->xpcs)
 		xpcs_destroy(priv->hw->xpcs);
-	}
 
 	mdiobus_unregister(priv->mii);
 	priv->mii->priv = NULL;