linux-kernel - Re: [PATCH V14 3/4] ptp: Added a clock driver for the IXP46x.

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Message-Id: <201104180856.04186.arnd@arndb.de>
Date:	Mon, 18 Apr 2011 08:56:03 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Christoph Lameter <cl@...ux.com>,
	David Miller <davem@...emloft.net>,
	John Stultz <john.stultz@...aro.org>,
	Krzysztof Halasa <khc@...waw.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Rodolfo Giometti <giometti@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Mike Frysinger <vapier@...too.org>,
	Paul Mackerras <paulus@...ba.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH V14 3/4] ptp: Added a clock driver for the IXP46x.

On Monday 18 April 2011, Richard Cochran wrote:
> +static void ixp_rx_timestamp(struct port *port, struct sk_buff *skb)
> +{
> +       struct skb_shared_hwtstamps *shhwtstamps;
> +       struct ixp46x_ts_regs *regs;
> +       u64 ns;
> +       u32 ch, hi, lo, val;
> +       u16 uid, seq;
> +
> +       if (!port->hwts_rx_en)
> +               return;
> +
> +       ch = PORT2CHANNEL(port);
> +
> +       regs = (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
> +
> +       val = __raw_readl(&regs->channel[ch].ch_event);
> +
> +       if (!(val & RX_SNAPSHOT_LOCKED))
> +               return;
> +
> +       lo = __raw_readl(&regs->channel[ch].src_uuid_lo);
> +       hi = __raw_readl(&regs->channel[ch].src_uuid_hi);
> +

I guess you should use readl(), not __raw_readl() here. The __raw_* functions
are not meant for device drivers.

	Arnd
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