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

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Date:	Tue, 03 Feb 2009 12:06:55 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	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 Tue, 2009-02-03 at 06:06 +0100, Ingo Molnar wrote:
> 
> Mutexes should work just fine in irqs-off sections - they'll safely 
> save/restore interrupts, even the debug variants.

mutex_lock() has might_sleep() which will generate a splat in atomic
contexts.

That said, afaik the acpi code uses semaphores.

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