struct net_device *dev;
        struct eth_plat_info *plat = pdev->dev.platform_data;
        u32 regs_phys;
-       char phy_id[BUS_ID_SIZE];
+       char phy_id[MII_BUS_ID_SIZE + 3];
        int err;
 
        if (!(dev = alloc_etherdev(sizeof(struct port))))
        __raw_writel(DEFAULT_CORE_CNTRL, &port->regs->core_control);
        udelay(50);
 
-       snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT, "0", plat->phy);
+       snprintf(phy_id, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, "0", plat->phy);
        port->phydev = phy_connect(dev, phy_id, &ixp4xx_adjust_link, 0,
                                   PHY_INTERFACE_MODE_MII);
        if ((err = IS_ERR(port->phydev)))