linux-kernel - Re: 2.6.23-rc8-mm1, -rc7-mm1 kill audio on HP nx6325

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Date:	Tue, 25 Sep 2007 16:29:45 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, Andi Kleen <ak@...e.de>,
	Takashi Iwai <tiwai@...e.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.23-rc8-mm1, -rc7-mm1 kill audio on HP nx6325

On Tuesday, 25 September 2007 15:44, Thomas Gleixner wrote:
> On Tue, 2007-09-25 at 15:20 +0200, Rafael J. Wysocki wrote:
> > > The patch is correct. Instead of returning "Success" in the case of a
> > > failure of lookup_address, it now returns -EINVAL, which in turn makes
> > > the ioremap fail.
> > > 
> > > OTOH, the driver ioremap call looks straight forward. Can you apply the
> > > patch below and provide the resulting debug output please ?
> > 
> > lookup failed for 18446604438082158592
> > [--snipped some USB messages--]
> > ALSA /home/rafael/src/mm/linux-2.6.23-rc8-mm1/sound/pci/hda/hda_intel.c:1756: hda-intel: ioremap error: 2349334528 16384
> 
> Stupid me, hex formatting would have been easier to read :)
> 
> Lookup failed for 0xFFFF 8100 8C08 0000
> ioremap:          0x0000 0000 8C08 0000 length 16384
> 
> It seems, that this patch only reveals some other wreckage. The code is
> called as part of ioremap, where it adjusts the caching attributes of
> the mapping, which was setup right before change_page_attr_address() is
> called.

Hm, it looks like the first address is a kernel one and the second one is
physical, so they apparently match, which means that the lookup shouldn't fail,
if I understand this correctly.

Greetings,
Rafael
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