linux-kernel - Re: PCI PM: Restore standard config registers of all devices early

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Date:	Mon, 2 Feb 2009 14:15:43 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Andreas Schwab <schwab@...e.de>, Len Brown <lenb@...nel.org>
Subject: Re: PCI PM: Restore standard config registers of all devices early

On Mon, 2 Feb 2009, Rafael J. Wysocki wrote:
> 
> I think it would be easier to make ACPI allow us to run AML with interrupts
> off.

Well, I'd agree, except I have this strong memory of us having known bugs 
with ACPI turning hard-interrupts on again. Similarly, it uses mutexes etc 
that simply don't work with interrupts off and/or may turn them on again 
thanks to scheduling.

"Fixing" that seems not very easy. ACPI has a bad habit of being _really_ 
hard to fix in this area.

I do agree that _if_ we can just fix ACPI, we wouldn't have these issues, 
and we should  just call it with interrupts disabled with our existing 
code. But my previous email was a "maybe we can do it like this" kind of 
thing, which might allow us to use ACPI with none of the irq-off issues.

		Linus
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