linux-kernel - Re: [PATCH] net: fec: add support of ethtool get

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Message-ID: <554E8735.302@gmail.com>
Date:	Sun, 10 May 2015 00:16:21 +0200
From:	Philippe Reynes <tremyfr@...il.com>
To:	Fabio Estevam <festevam@...il.com>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Duan Fugang-B38611 <B38611@...escale.com>,
	Frank Li <Frank.Li@...escale.com>,
	Lothar Waßmann <LW@...o-electronics.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: fec: add support of ethtool get_regs

Hi Fabio,

On 09/05/15 23:59, Fabio Estevam wrote:
> Philippe,
>
> On Sat, May 9, 2015 at 6:17 PM, Russell King - ARM Linux
> <linux@....linux.org.uk>  wrote:
>
>> Using memcpy_fromio() to copy device registers is not a good idea -
>> it can use a variable access size which can cause bus faults.
>
> An example on how memcpy_fromio() can be avoided in get_regs:
> drivers/net/ethernet/samsung/sxgbe/sxgbe_ethtool.c

Thanks for pointing me this example. I've already send a patch,
and I've used drivers/net/ethernet/freescale/gianfar_ethtool.c
as example. I hope it's a good example too.

> Regards,
>
> Fabio Estevam

Regards,
Philippe
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