netdev - Re: [net-next-2.6 PATCH v2] can: SJA1000: generic OF platform bus driver

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Message-ID: <20090526112006.GH22742@pengutronix.de>
Date:	Tue, 26 May 2009 13:20:06 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	David Miller <davem@...emloft.net>, linuxppc-dev@...abs.org,
	wg@...ndegger.com, devicetree-discuss@...abs.org,
	netdev@...r.kernel.org, Greg Ungerer <gerg@...inux.org>
Subject: Re: [net-next-2.6 PATCH v2] can: SJA1000: generic OF platform bus
	driver

On Tue, May 26, 2009 at 10:42:05AM +0100, Arnd Bergmann wrote:
> On Tuesday 26 May 2009, David Miller wrote:
> > It's such a baroque thing, there is no reason to set it at all if you
> > ask me.  It's only use is to allow ISA and similar primitive bus
> > devices to have their I/O ports changed via ifconfig.
> 
> My original comment was about the fact that sja1000 was doing
> dev->base_addr = (unsigned long)ioremap(phys_addr, size), I didn't
> even think about SIOCGIFMAP and command line overrides, but that
> surely makes it worse and the driver should be changed to
> store the virtual register address in its private data structure.
> 
> drivers/net/fec.c seems to have the same problem, which manifests
> in a number of ugly casts and direct pointer dereferences in places
> where it should do writel() or out_be32().

Ack. I'll prepare a patch for fec.c. Internally the driver already uses
a void __iomem * and writel/readl in -next. There is only one usage
left.

Sascha

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