linux-kernel - Re: PCI resources allocation problem on Toshiba Satellite A40

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Date:	Fri, 14 Aug 2009 03:40:58 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Frans Pop <elendil@...net.nl>
Cc:	torvalds@...ux-foundation.org, 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: PCI resources allocation problem on Toshiba Satellite A40

Frans Pop wrote:
> 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.

The commit that resulted in the messages disappearing was:
commit a76117dfd687ec4be0a9a05214f3009cc5f73a42
Author: Matthew Wilcox <willy@...ux.intel.com>
Date:   Wed Jun 17 16:33:35 2009 -0400
    x86: Use pci_claim_resource

> 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

The commit that caused the messages to return is:
commit 79896cf42f6a96d7e14f2dc3473443d68d74031d
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Sun Aug 2 14:04:19 2009 -0700
    Make pci_claim_resource() use request_resource() rather than insert_resource()

The affected devices are the two USB UHCI controllers.

Cheers,
FJP


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