linux-kernel - Re: [Regression] PCI resources allocation problem on HP nx6325

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Message-Id: <200908132128.31439.elendil@planet.nl>
Date:	Thu, 13 Aug 2009 21:28:29 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	mano@...rinelk.homelinux.net, rjw@...k.pl, willy@...ux.intel.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	akpm@...ux-foundation.org, andrew.patterson@...com
Subject: Re: [Regression] PCI resources allocation problem on HP nx6325

Linus Torvalds wrote:
> I'm not going to do anything about it right now, since clearly we've
> not changed any actual behavior from before. But if you remind me after
> 2.6.31 is out, I'll look at perhaps making a better
> "pci_claim_resource()" that actually iterates over the different parent
> resources and doesn't just try to find one (and then fail if that
> particular one doesn't work out).

Just for your information, this issue also affects my (old) Toshiba
Satellite A40.

With pre-2.6.31 kernels I always had the following in dmesg:
pci 0000:00:1d.0: BAR 4: can't allocate resource
pci 0000:00:1d.1: BAR 4: can't allocate resource
[...]
pnp 00:08: io resource (0x10-0x1f) overlaps 0000:00:1d.0 BAR 4 (0x0-0x1f), disabling
pnp 00:08: io resource (0x10-0x1f) overlaps 0000:00:1d.1 BAR 4 (0x0-0x1f), disabling

I was very happy to see that for 2.6.31-rc2 those messages were gone.

But with .31-rc5 they are back again, with added "address space collision":
pci 0000:00:1d.0: BAR 4: address space collision on of device [0xcfe0-0xcfff]
pci 0000:00:1d.0: BAR 4: can't allocate resource
pci 0000:00:1d.1: BAR 4: address space collision on of device [0xcf80-0xcf9f]
pci 0000:00:1d.1: BAR 4: can't allocate resource
[...]
pnp 00:08: io resource (0x10-0x1f) overlaps 0000:00:1d.0 BAR 4 (0x0-0x1f), disabling
pnp 00:08: io resource (0x10-0x1f) overlaps 0000:00:1d.1 BAR 4 (0x0-0x1f), disabling

It's never resulted in things not working, but it would still be nice if
it got solved. Please let me know if you'd like anything tested.

Cheers,
FJP
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