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>

drivers/net/phy/mdio_bus.c

@@ -35,6 +35,18 @@
 #include <asm/irq.h>
 #include <asm/uaccess.h>
 
+/**
+ * mdiobus_alloc - allocate a mii_bus structure
+ *
+ * Description: called by a bus driver to allocate an mii_bus
+ * structure to fill in.
+ */
+struct mii_bus *mdiobus_alloc(void)
+{
+	return kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
+}
+EXPORT_SYMBOL(mdiobus_alloc);
+
 /**
  * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
  * @bus: target mii_bus
@@ -87,6 +99,18 @@ void mdiobus_unregister(struct mii_bus *bus)
 }
 EXPORT_SYMBOL(mdiobus_unregister);
 
+/**
+ * mdiobus_free - free a struct mii_bus
+ * @bus: mii_bus to free
+ *
+ * This function frees the mii_bus.
+ */
+void mdiobus_free(struct mii_bus *bus)
+{
+	kfree(bus);
+}
+EXPORT_SYMBOL(mdiobus_free);
+
 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
 {
 	struct phy_device *phydev;