macb: use random mac if stored address in EEPROM is invalid

We should use a random mac address if the EEPROM doesn't contain a valid
one. This makes life on Boards with unprogrammed EEPROM devices easier.
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/macb.c

@@ -80,8 +80,12 @@ static void __init macb_get_hwaddr(struct macb *bp)
 	addr[4] = top & 0xff;
 	addr[5] = (top >> 8) & 0xff;
 
-	if (is_valid_ether_addr(addr))
+	if (is_valid_ether_addr(addr)) {
 		memcpy(bp->dev->dev_addr, addr, sizeof(addr));
+	} else {
+		dev_info(&bp->pdev->dev, "invalid hw address, using random\n");
+		random_ether_addr(bp->dev->dev_addr);
+	}
 }
 
 static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)