linux-kernel - Re: [PATCH] PCI: nVidia's MCP61 ethernet card needs quirk for wrong class

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Message-ID: <20071001171543.GA6653@kroah.com>
Date:	Mon, 1 Oct 2007 10:15:43 -0700
From:	Greg KH <greg@...ah.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Jiri Kosina <jkosina@...e.cz>, Jeff Garzik <jgarzik@...ox.com>,
	Ayaz Abdulla <aabdulla@...dia.com>,
	linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: nVidia's MCP61 ethernet card needs quirk for
	wrong class

On Mon, Oct 01, 2007 at 11:03:38AM -0600, Matthew Wilcox wrote:
> On Mon, Oct 01, 2007 at 09:25:46AM -0700, Greg KH wrote:
> > For config items, we don't want to modify them in any way, we just want
> > to pass-through the data direct from the device.  Look at the sysfs and
> > proc files for pci config spaces.  They are returning binary data stored
> > in the device directly.  We do not want to have to start modifying that
> > data directly just to handle messed up devices like this.
> 
> Nobody's talking about changing the raw pci data.  What we're talking
> about is changing the value read out of
> 
> $ cat /sys/bus/pci/devices/0000\:00\:00.0/class 
> 0x060000

I know, but the next request will be to also fix up those raw values as
someone will have a tool that only uses them :)

> We do tweak at least some of the other similar values (vendor, for sure)
> to work around bugs; not sure we have an example for changing the class
> value yet.
> 
> pciutils knows that the kernel has potentially fixed up the values in
> the individual files, and to trust those over the raw data.

Ah, cool, I didn't realize that pciutils handled this kind of mismatch.
That's good to know.

thanks,

greg k-h
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