linux-kernel - Re: [PATCH][NET] several cleanups and bugfixes for fec.c: don't munge MAC address from platform data

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Message-ID: <20191.10281.826050.193987@ipc1.ka-ro>
Date:	Wed, 7 Dec 2011 09:47:37 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	<netdev@...r.kernel.org>, Shawn Guo <shawn.guo@...aro.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH][NET] several cleanups and bugfixes for fec.c: don't
 munge MAC address from platform data

Hi,

Shawn Guo writes:
> On Tue, Dec 06, 2011 at 11:27:13AM +0100, Lothar Waßmann wrote:
> > When the MAC address is supplied via platform_data it should be OK as
> > it is and should not be modified in case of a dual FEC setup.
> > Also copying the MAC from platform_data to the single 'macaddr'
> > variable will overwrite the MAC for the first interface in case of a
> > dual FEC setup.
> 
> Hmm, I do not follow that.  If 'macaddr' holds a valid mac address,
> the code path has no chance to be hit at all.  Otherwise, 'macaddr'
> is just a place holder for copying mac address from pdata, in which
> case the mac address will be fixed up at the end of the function for
> dual FEC setup.
> 
In case of dual FEC and MAC address provided by platform_data the
first mac address will be copied to the 'macaddr' variable with no
chance for the second interface to get its mac address assigned from
platform_data too.


Lothar Waßmann
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