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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net: fec: add support of ethtool get_regs
Date: Sat, 09 May 2015 17:31:25 -0400 (EDT)
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From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Date: Sat, 9 May 2015 22:17:46 +0100

> On Sat, May 09, 2015 at 10:52:08PM +0200, Philippe Reynes wrote:
>> +static void fec_enet_get_regs(struct net_device *ndev,
>> +			      struct ethtool_regs *regs, void *regbuf)
>> +{
>> +	struct fec_enet_private *fep = netdev_priv(ndev);
>> +
>> +	memcpy_fromio(regbuf, fep->hwp, regs->len);
> 
> Using memcpy_fromio() to copy device registers is not a good idea -
> it can use a variable access size which can cause bus faults.

Agreed.