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

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Date:	Tue, 25 Sep 2007 15:44:03 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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.

	tglx


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