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

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Date:	Tue, 6 Dec 2011 14:44:44 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Baruch Siach <baruch@...s.co.il>
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,

Baruch Siach writes:
> Hi Lothar,
> 
> 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.
> > 
> > Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
> > ---
> >  drivers/net/ethernet/freescale/fec.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
> > index e2b5ce6..11534b9 100644
> > --- a/drivers/net/ethernet/freescale/fec.c
> > +++ b/drivers/net/ethernet/freescale/fec.c
> > @@ -818,7 +818,7 @@ static void __inline__ fec_get_mac(struct net_device *ndev)
> >  			iap = (unsigned char *)FEC_FLASHMAC;
> >  #else
> >  		if (pdata)
> > -			memcpy(iap, pdata->mac, ETH_ALEN);
> > +			iap = (unsigned char *)&pdata->mac;
> 
> Since pdata might point to __initdata struct, you must hold a copy of its 
> content.
> 
No. platform_data must be present during the life time of a driver
using it and thus must never be __initdata!


Lothar Waßmann
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