RE: [PATCH 01/15] ACPICA: Disassembler: Enhance resource descriptor detection

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> -----Original Message-----
> From: Linda Knippers [mailto:linda.knippers@xxxxxxx]
> Sent: Tuesday, June 13, 2017 6:42 AM
> To: Rafael J. Wysocki <rafael@xxxxxxxxxx>
> Cc: Moore, Robert <robert.moore@xxxxxxxxx>; Zheng, Lv
> <lv.zheng@xxxxxxxxx>; Wysocki, Rafael J <rafael.j.wysocki@xxxxxxxxx>;
> Rafael J . Wysocki <rjw@xxxxxxxxxxxxx>; Brown, Len
> <len.brown@xxxxxxxxx>; Box, David E <david.e.box@xxxxxxxxx>; Lv Zheng
> <zetalog@xxxxxxxxx>; ACPI Devel Maling List <linux-acpi@xxxxxxxxxxxxxxx>
> Subject: Re: [PATCH 01/15] ACPICA: Disassembler: Enhance resource
> descriptor detection
> 
> 
> 
> On 6/5/2017 4:55 PM, Rafael J. Wysocki wrote:
> > On Mon, Jun 5, 2017 at 10:51 PM, Linda Knippers
> <linda.knippers@xxxxxxx> wrote:
> >> On 6/5/2017 4:42 PM, Rafael J. Wysocki wrote:
> >> <snip>
> >>
> >>>> I talked to our FW team and we do generate checksums and not a zero
> >>>> for at least some of the AML. Please revert this change until you
> >>>> can also validate a checksum.  Or shall I post a patch to remove
> >>>> the check?
> >>>
> >>>
> >>> I'll skip this patch, no need to do anything else.  Thanks for your
> >>> report!
> >>
> >>
> >> Thanks.  This patch is already in as of 4.12rc1 and not part of the
> >> most recent ACPICA drop.
> >
> > Ah, OK.
> >
> > I should have checked I guess. :-)
> >
> > Anyway, I'll revert it, then.
> 
> Hi Rafael, Is this still in the queue to be reverted?
> I see it's still in rc5 but it really needs to go before 4.12 is
> released.
> We've been broken since rc1.
> 
> Thanks,
> 
> -- ljk
> >
> >>> Bob, can you revert this upstream, please?  It looks like the
> >>> assumption it is based on doesn't hold.
> >>
[Moore, Robert] 

It is on our list of things to look at, now that acpi 6.2 is released.

This has been a rather odd problem that we have been trying to fix for some time now; so we will of course need to come up with a permanent fix.



> >> Bob, I'm happy to test something if there is a new patch that looks
> >> for zero or a valid checksum.  TBH, I'm not 100% certain that our
> >> checksums are correct because nothing has ever tried to verify them.
> >
> > Well, that's part of the problem here I guess.  If they have never
> > been tested, they cannot be trusted.
> >
> > Still, the commit in question clearly assumed that value to always be
> > 0 and it clearly is not the case here.
> >
> > Thanks,
> > Rafael
> >
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