Bug 12758

Summary: ACPI exception with 2.6.29-rc6
Product: ACPI Reporter: Rafael J. Wysocki (rjw)
Component: ACPICA-CoreAssignee: Len Brown (lenb)
Status: CLOSED CODE_FIX    
Severity: normal CC: acpi-bugzilla
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.29-rc6 Subsystem:
Regression: Yes Bisected commit-id:
Bug Depends on:    
Bug Blocks: 12398    
Attachments: Here comes the output of "acpidump"
revert offending patch from 2.6.29-rc6

Description Rafael J. Wysocki 2009-02-23 14:34:41 UTC 
Subject    : ACPI exception with 2.6.29-rc6
Submitter  : Heinz Diehl <htd@fancy-poultry.org>
Date       : 2009-02-23 16:46
References : http://marc.info/?l=linux-kernel&m=123540758700861&w=4

This entry is being used for tracking a regression from 2.6.28.  Please don't
close it until the problem is fixed in the mainline.
Comment 1 Heinz Diehl 2009-02-24 06:47:59 UTC 
Created attachment 20350 [details]
Here comes the output of "acpidump"
Comment 2 Len Brown 2009-02-25 15:03:55 UTC 
Created attachment 20368 [details]
revert offending patch from 2.6.29-rc6

Thanks for the acpidump.

The DSDT does indeed defines an opregion covering the ELCR:

    OperationRegion (ELCR, SystemIO, 0x04D0, 0x02)
    Field (ELCR, ByteAcc, NoLock, Preserve)
    {
        ELC1,   8,
        ELC2,   8
    }

However, no AML in the system actually references this opregion,
so the Linux warning is a false positive.

Bob Moore pointed out that if we checked our illegal IO port
address list at run-time rather than init-time, then we'd not
have any warnings on this box; and he volunteered to put that
check into upstream ACPICA.

So I'll delete the init-time check from Linux (we've lived without
it from pre-history until 2.6.29-rc) and we'll test the run-time
ACPICA address validation when it becomes available.
Comment 3 Rafael J. Wysocki 2009-03-07 14:11:14 UTC 
On Wednesday 04 March 2009, Zhang Rui wrote:
> On Wed, 2009-03-04 at 03:22 +0800, Rafael J. Wysocki wrote:
> 
> > Bug-Entry       : http://bugzilla.kernel.org/show_bug.cgi?id=12758
> > Subject         : ACPI exception with 2.6.29-rc6
> > Submitter       : Heinz Diehl <htd@fancy-poultry.org>
> > Date            : 2009-02-23 16:46 (9 days old)
> > References      : http://marc.info/?l=linux-kernel&m=123540758700861&w=4
> > 
> Handled by: Len Brown <len.brown@intel.com>
> Patch-available:
> http://bugzilla.kernel.org/attachment.cgi?id=20368&action=view

Handled-By : Len Brown <lenb@kernel.org>
Patch : http://bugzilla.kernel.org/attachment.cgi?id=20368&action=view
Comment 4 Len Brown 2009-03-17 10:00:14 UTC 
shipped upstream on top of 2.6.29-rc8-git2
closed.