phylib: move to dynamic allocation of struct mii_bus

This patch introduces mdiobus_alloc() and mdiobus_free(), and
makes all mdio bus drivers use these functions to allocate their
struct mii_bus'es dynamically.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Andy Fleming <afleming@freescale.com>
diff --git a/drivers/net/fs_enet/mii-bitbang.c b/drivers/net/fs_enet/mii-bitbang.c
index 2774252..49b6645 100644
--- a/drivers/net/fs_enet/mii-bitbang.c
+++ b/drivers/net/fs_enet/mii-bitbang.c
@@ -218,9 +218,9 @@
 out_unmap_regs:
 	iounmap(bitbang->dir);
 out_free_bus:
-	kfree(new_bus);
-out_free_priv:
 	free_mdio_bitbang(new_bus);
+out_free_priv:
+	kfree(bitbang);
 out:
 	return ret;
 }
@@ -231,12 +231,11 @@
 	struct bb_info *bitbang = bus->priv;
 
 	mdiobus_unregister(bus);
-	free_mdio_bitbang(bus);
 	dev_set_drvdata(&ofdev->dev, NULL);
 	kfree(bus->irq);
+	free_mdio_bitbang(bus);
 	iounmap(bitbang->dir);
 	kfree(bitbang);
-	kfree(bus);
 
 	return 0;
 }