linux-kernel - Re: [git pull request] ACPI and driver patches for 2.6.33.merge

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Date:	Wed, 23 Dec 2009 08:56:37 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Len Brown <lenb@...nel.org>,
	"Barnes, Jesse" <jesse.barnes@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [git pull request] ACPI and driver patches for 2.6.33.merge

On Tue, Dec 22, 2009 at 06:08:57PM +0800, Yinghai Lu wrote:
> Ingo Molnar wrote:
> > * Shaohua Li <shaohua.li@...el.com> wrote:
> > 
> >> On Fri, Dec 18, 2009 at 09:28:50AM +0800, Yinghai Lu wrote:
> >>> On Wed, Dec 16, 2009 at 12:06 PM, Len Brown <lenb@...nel.org> wrote:
> >>>> Hi Linus,
> >>>>
> >>>> please pull from:
> >>>>
> >>>> git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6.git release
> >>>>
> >>> ;..
> >>>> Shaohua Li (3):
> >>>> ? ? ?ACPI: Add a generic API for _OSC -v2
> >>>> ? ? ?ACPI: cleanup pci_root _OSC code.
> >>>> ? ? ?ACPI: Add platform-wide _OSC support.
> >>> it seems these three patches broke the _OSC on my intel new systems.
> >>>
> >>> revert them fix the problem with AER and pciehp and etc
> >> can you give more details? I just cleaned up the _OSC code for AER and 
> >> pciehp, no function changes.
> > 
> > Famous last words ;-)
> > 
> > Yinghai, i suspect Shaohua needs the kind of info you'd need if you tried to 
> > fix it: acpidump, before/after debug boot log, a description of what goes bad, 
> > etc.
> 
> the so called clean up, change the ret length checking.
> 
> -       if (!output.length)
> -               return AE_NULL_OBJECT;
> -
> 
> +       /* return buffer should have the same length as cap buffer */
> +       if (context->ret.length != context->cap.length)
> +               return AE_NULL_OBJECT;
Wield BIOS. ACPI spec does mention the return buffer have the same length.
Does changing the check back make the issue go away?

Thanks,
Shaohua
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