netdev - Re: [PATCH 03/10] net/fec: add mac field into platform data and consolidate fec_get

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Message-ID: <20101229115808.GF19347@freescale.com>
Date:	Wed, 29 Dec 2010 19:58:09 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	Baruch Siach <baruch@...s.co.il>, <davem@...emloft.net>,
	<gerg@...pgear.com>, <eric@...rea.com>, <bryan.wu@...onical.com>,
	<r64343@...escale.com>, <B32542@...escale.com>,
	<lw@...o-electronics.de>, <w.sang@...gutronix.de>,
	<s.hauer@...gutronix.de>, <linux-arm-kernel@...ts.infradead.org>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH 03/10] net/fec: add mac field into platform data and
 consolidate fec_get_mac

Hi Uwe,

On Wed, Dec 29, 2010 at 11:31:38AM +0100, Uwe Kleine-König wrote:
> Hello Shawn,
> 
> On Wed, Dec 29, 2010 at 06:05:21PM +0800, Shawn Guo wrote:
> > On Wed, Dec 29, 2010 at 08:53:30AM +0200, Baruch Siach wrote:
> > > Hi Shawn,
> > > In the case of dual MAC that you later add support for, the address which one 
> > > is being set? Is there a way to set both in kernel command line?
> > > 
> > The fec0 gets fec_mac and fec1 gets fec_mac + 1. The following code
> > in function fec_get_mac takes care of it.
> > 
> > 	/* Adjust MAC if using default MAC address */
> default MAC address means the address passed via cmdline?  Sounds
> confusing to me.
Will change the comment and fec_mac_default name to address
the concern.

> 
> > 	if (iap == fec_mac_default)
> > 		dev->dev_addr[ETH_ALEN-1] = fec_mac_default[ETH_ALEN-1] + fep->pdev->id;
> Can this overflow?  (I didn't check the code, so my concern might be
> completely stupid here.)
No. dev->dev_addr points to netdev_hw_addr->addr, which is a 32 bytes array.

-- 
Regards,
Shawn

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