linux-kernel - Re: [RFC][PATCH 2/2] PM: Rework handling of interrupts during suspend-resume

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Message-ID: <alpine.LFD.2.00.0902261620370.3111@localhost.localdomain>
Date:	Thu, 26 Feb 2009 16:27:29 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arve Hjønnevåg <arve@...roid.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH 2/2] PM: Rework handling of interrupts during 
 suspend-resume



On Thu, 26 Feb 2009, Arve Hjønnevåg wrote:
> 
> How many sysdevs use interrupts?
> 
> I found may drivers in the mainline kernel that use enable_irq_wake,
> but I did not see any that handle this race condition.

The _only_ driver that does enable_irq_wake() on x86 is the cmos timer 
driver, and even there it actually doesn't use irq_wake, but ACPI. Why? 
Because I don't think irq wakeup even _works_ on x86.

So the whole enable_irq_wake is largely some embedded ARM platform issue, 
and a very special case, and doesn't exist anywhere else.

Maybe I'm missing something, but it's definitely not the normal case.

		Linus
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