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

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Date:	Tue, 26 May 2009 19:40:43 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linuxppc-dev@...abs.org,
	Linux Netdev List <netdev@...r.kernel.org>,
	devicetree-discuss@...abs.org
Subject: Re: [net-next-2.6 PATCH v2] can: SJA1000: generic OF platform bus
 driver

On Tue, 2009-05-26 at 10:10 +0100, Arnd Bergmann wrote:
> On Monday 25 May 2009, Wolfgang Grandegger wrote:
> > > Right, that makes sense. However, most drivers use the field to store the
> > > physical address, not the iomap token. Maybe there should be a new field
> > > in struct sja1000_priv for the virtual address, but that would be a change
> > > to the base driver, not just to the OF portion.
> > 
> > Is that common practice? If yes, I will add a member to store the
> > virtual address to struct sja1000_priv.
> 
> I grepped through the network driver for usage of ->base_addr, and
> it's somewhat inconsistent. The majority of the users use it for
> a physical address, but there are also a few that use it for the
> __iomem token.

In addition, iirc, it's not big enough to hold >32 bit physical
addresses on 32-bit platforms no ?

Ben.

> Casts between unsigned long and qualified (__iomem, __user, const, ...)
> pointers do not cause a warning, but can easily lead to bugs when
> another user casts to an unqualified pointer.
> 
> 	Arnd <><
> 
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