From: Feng Kan <[email protected]>
Date: Thu, 18 Dec 2014 15:39:51 -0800

> +#define NO_MAC_FOUND 0
> +#define RES_ENET_CSR 0
> +#define RES_RING_CSR 1
> +#define RES_RING_CMD 2

Don't define your own magic set of error return semantics.

For example, in the MAC address acquisition case, just verify that
you get an ETH_ALEN length value from the fetch routines and return
-ENODEV or similar if you do not.
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