linux-kernel - Re: [Bug #11550] pnp: Huge number of "io resource overlap" messages

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Message-Id: <200809271716.39119.elendil@planet.nl>
Date:	Sat, 27 Sep 2008 17:16:37 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Rene Herman <rene.herman@...access.nl>,
	linux-kernel@...r.kernel.org, Rene Herman <rene.herman@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Matthew Wilcox <matthew@....cx>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, bugme-daemon@...zilla.kernel.org
Subject: Re: [Bug #11550] pnp: Huge number of "io resource overlap" messages

On Friday 26 September 2008, Bjorn Helgaas wrote:
> Here's another approach based on section 3.5 of the PCI Firmware spec.
> It says:
>
>   Since not all devices may be configured prior to the operating
>   system handoff, the operating system needs to know whether a
>   specific BAR register has been configured by firmware. The operating
>   system makes the determination by checking the I/O Enable, and
>   Memory Enable bits in the device's command register, and Expansion
>   ROM BAR enable bits. If the enable bit is set, then the corresponding
>   resource register has been configured.
>
> So instead of checking whether the BAR contains zero, the patch below
> checks the I/O, Mem, and ROM BAR enable bits to determine whether a
> BAR is enabled.

That seems to nicely match what the BIOS setting does on my laptop.

> Frans, I'm sorry to trouble you again, but could you test this and
> make sure it takes care of the "resource overlap" messages you saw?

No problem at all. Works correctly (applied on top of current git).
I don't see any unexpected changes in the dmesg output, so:

Tested-by: Frans Pop <elendil@...net.nl>

Cheers,
FJP
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