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

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Message-ID: <20150509211746.GY2067@n2100.arm.linux.org.uk>
Date:	Sat, 9 May 2015 22:17:46 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Philippe Reynes <tremyfr@...il.com>
Cc:	davem@...emloft.net, B38611@...escale.com, Frank.Li@...escale.com,
	LW@...O-electronics.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: fec: add support of ethtool get_regs

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.

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