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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 26 May 2009 02:25:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	linuxppc-dev@...abs.org, wg@...ndegger.com,
	devicetree-discuss@...abs.org, netdev@...r.kernel.org
Subject: Re: [net-next-2.6 PATCH v2] can: SJA1000: generic OF platform bus
 driver

From: Arnd Bergmann <arnd@...db.de>
Date: Tue, 26 May 2009 10:10:30 +0100

> 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.
> 
> 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.

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.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html