netdev - Re: [PATCH] net: eth: xgene: change APM X-Gene SoC platform ethernet to support ACPI

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Message-Id: <20141219.123107.1080751255468272638.davem@davemloft.net>
Date:	Fri, 19 Dec 2014 12:31:07 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	fkan@....com
Cc:	netdev@...r.kernel.org, patches@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: eth: xgene: change APM X-Gene SoC platform
 ethernet to support ACPI

From: Feng Kan <fkan@....com>
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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