linux-kernel - Re: [tip:x86/apic] x86: MSI: check for BIOS assigned addresses

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Message-ID: <49B1C884.2020301@kernel.org>
Date:	Fri, 06 Mar 2009 17:06:12 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Daniel Yeisley <dan.yeisley@...sys.com>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, stable@...nel.org,
	tglx@...utronix.de, linux-pci@...r.kernel.org
Subject: Re: [tip:x86/apic] x86: MSI: check for BIOS assigned addresses

Ingo Molnar wrote:
> * Daniel Yeisley <dan.yeisley@...sys.com> wrote:
> 
>> On Fri, 2009-03-06 at 19:45 +0100, Ingo Molnar wrote:
>>> * Daniel Yeisley <dan.yeisley@...sys.com> wrote:
>>>
>>>> Commit-ID:  affd49d36e2e2df4cbb3e07a57db901c23823b6a
>>>> Gitweb:     http://git.kernel.org/tip/affd49d36e2e2df4cbb3e07a57db901c23823b6a
>>>> Author:     "Daniel Yeisley" <dan.yeisley@...sys.com>
>>>> AuthorDate: Fri, 6 Mar 2009 10:11:49 -0500
>>>> Commit:     Ingo Molnar <mingo@...e.hu>
>>>> CommitDate: Fri, 6 Mar 2009 19:32:44 +0100
>>>>
>>>> x86: MSI: check for BIOS assigned addresses
>>>>
>>>> Impact: fix ACPI hotplug on certain systems
>>> Note, this commit means that i moved the commit over from 
>>> tip:x86/urgent into tip:x86/apic - i.e. with a 2.6.30 merge 
>>> date. When exactly was this regression introduced? I think this 
>>> code never really accepted the MSI settings from the firmware, 
>>> so changing that behavior might affect a lot of systems.
>>>
>>> So i'm uneasy about applying this fix this late in the .29 
>>> cycle, but marked it for -stable backport so it could hit 
>>> 2.6.29.1 if it stays problem-free.
>>>
>>> 	Ingo
>> I initially noticed the problem on a 2.6.18 kernel.  ACPI 
>> hotplugging didn't work unless I booted with pci=nomsi.  I 
>> don't have a problem with waiting until 2.6.30 to make sure it 
>> is thoroughly tested.
> 
> Okay - so it's an ancient bug. The current track should thus be 
> fine.
> 

please drop this patch. it seems it break msi-x.
at least igbe with msi-x does not work anymore.

YH
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