From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755054Ab1LGIrw (ORCPT ); Wed, 7 Dec 2011 03:47:52 -0500 Received: from mail.karo-electronics.de ([81.173.242.67]:65394 "EHLO mail.karo-electronics.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754901Ab1LGIrv (ORCPT ); Wed, 7 Dec 2011 03:47:51 -0500 Message-ID: <20191.10282.826634.821906@ipc1.ka-ro> Date: Wed, 7 Dec 2011 09:47:38 +0100 From: =?utf-8?Q?Lothar_Wa=C3=9Fmann?= To: Shawn Guo Cc: Baruch Siach , , Shawn Guo , , Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH][NET] several cleanups and bugfixes for fec.c: don't munge MAC address from platform data In-Reply-To: <20111207085702.GE5550@S2100-06.ap.freescale.net> References: <55b78c1766da5b0d0d679f5eae3fb9fc74a6ceef.1323163127.git.LW@KARO-electronics.de> <20111206124857.GB14048@sapphire.tkos.co.il> <20190.7244.156557.313315@ipc1.ka-ro> <20111207085702.GE5550@S2100-06.ap.freescale.net> X-Mailer: VM 8.0.9 under Emacs 22.2.1 (i486-pc-linux-gnu) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Shawn Guo writes: > On Tue, Dec 06, 2011 at 02:44:44PM +0100, Lothar Waßmann wrote: > > 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 > > > > --- > > > > 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. > > > > > As iap will anyway be copied to ndev->dev_addr after that, it may still > be fine to take this patch, for obviously for different reason. > > > No. platform_data must be present during the life time of a driver > > using it and thus must never be __initdata! > > > Then we need to fix a lot of imx/mxc platform codes, mach-mx28evk.c > is the one for this case. > Nope. The platform_data provided there is only a template that is copied to kmalloc'ed memory by the mxs_add...() functions. With actual platform_data in init memory no driver built as module would work. Lothar Waßmann -- ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Geschäftsführer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info@karo-electronics.de ___________________________________________________________