linux-kernel - Re: a7839e96 (PNP: increase max resources) breaks my ALSA intel8x0 sound card

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Date:	Mon, 28 Jan 2008 09:15:23 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Avuton Olrich <avuton@...il.com>,
	Zhao Yakui <yakui.zhao@...el.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thomas Renninger <trenn@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Linux-Kernel," <linux-kernel@...r.kernel.org>,
	Alsa-Devel <alsa-devel@...a-project.org>
Subject: Re: a7839e96 (PNP: increase max resources) breaks my ALSA intel8x0
	sound card


On Mon, 2008-01-28 at 08:50 +1100, Linus Torvalds wrote:
> 
> On Sun, 27 Jan 2008, Avuton Olrich wrote:
> >
> > With v2.6.24 my second ALSA sound device stopped working.
> 
> Hmm. Why is PnP ACPI called before PCI probing? That seems to be the 
> problem here - we should *never* have any firmware allocation block known 
> hardware BARs, they should only be blocking new dynamic allocations.
> 
> Hmm. I wonder if the problem is that ACPIPnP marks the regions busy. That 
> would be wrong. They shouldn't be busy, they should just "exist".
> 
> A busy region will stop a "request_region()" (incorrect for this case - 
> thats' not what the PnP resurce allocation should be all about), but an 
> *existing* resource will just stop a new resource being dynamically 
> assigned to that address (not not stop a known resource from using it).
> 
> So maybe the ACPIPnP allocation is doen at the right moment, just doing 
> the wrong thing..
This is because the region is declaimed in motherboard device. That is
BIOS thinks the region is reserved for motherboard. Maybe we should
blacklist the system too.

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