Re: [RFC PATCH] PCI-E broken on PPC (regression)

[Jesse Barnes <jbarnes@virtuousgeek.org>]

On Wed, 27 Jan 2010 16:01:21 -0800 (PST)
David Miller <davem@davemloft.net> wrote:

> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Date: Thu, 28 Jan 2010 09:00:12 +1100
> 
> > On Wed, 2010-01-27 at 08:26 -0800, Jesse Barnes wrote:
> >> 
> >> Thanks Ben.  Any refactoring we need to handle this stuff better is
> >> fine with me too.  I guess on some platforms calling pci_setup_device
> >> may cause problems with special platform devices? 
> > 
> > Well, we don't call pci_setup_device() because part of the deal is to
> > avoid all of that config space reading that it does :-) Especially in
> > the case of some of the IBM EADS bridges which don't let you access
> > everything we may want.
> 
> Same problem on sparc64, it's not safe to poke config space
> arbitrarily.  Some PCI controllers even have bugs which cause them to
> hang if you try to access some parts of the host controller's PCI
> config space.

Ok, that's what I thought.  We'll need to make these functions
available then...

-- 
Jesse Barnes, Intel Open Source Technology Center