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

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Message-Id: <200802141401.24723.bjorn.helgaas@hp.com>
Date:	Thu, 14 Feb 2008 14:01:24 -0700
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Robert Hancock <hancockr@...w.ca>,
	Andrew Morton <akpm@...ux-foundation.org>, avuton@...il.com,
	yakui.zhao@...el.com, shaohua.li@...el.com, trenn@...e.de,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	alsa-devel@...a-project.org
Subject: Re: a7839e96 (PNP: increase max resources) breaks my ALSA intel8x0 sound card

On Thursday 14 February 2008 01:26:59 pm Linus Torvalds wrote:
> 
> On Thu, 14 Feb 2008, Bjorn Helgaas wrote:
> 
> > On Thursday 14 February 2008 12:42:52 pm Linus Torvalds wrote:
> > > 
> > > It *shouldn't* fail.
> > > 
> > > Things should fail only when two different drivers have requested the same 
> > > region. NOT when something tells the system that a region _exists_.
> > 
> > The sound driver doesn't fail because two different drivers have
> > requested the same region; it fails because PNP told us a region
> > exists, and the sound region crosses the edge of the PNP region.
> 
> Right, and that was a bug.
> 
> It *shouldn't* fail. The PnP resource should be inserted _after_ the 
> PCI region has been inserted, and _that_ should fail, since the PnP region 
> is crap and cannot be inserted "half-way".

That means the PNP system driver has to be registered after the PCI
driver.  We can't guarantee that, especially if the sound driver is
a module.

Bjorn
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