linux-kernel - Re: [RFC][PATCH 1/4] PM: Rework handling of interrupts during suspend-resume (rev. 4)

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Message-ID: <alpine.LFD.2.00.0903021533130.3111@localhost.localdomain>
Date:	Mon, 2 Mar 2009 15:35:09 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arve Hjønnevåg <arve@...roid.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	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>,
	Alan Stern <stern@...land.harvard.edu>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [RFC][PATCH 1/4] PM: Rework handling of interrupts during 
 suspend-resume (rev. 4)



On Mon, 2 Mar 2009, Linus Torvalds wrote:
> 
> If IRQ_SUSPENDED _is_ set, then that means that we're after the 
> suspend_late() sequence and before the resume_early() sequence

Sorry, after the suspend, and before the resume.

We could be _in_ the suspend_late/resume_early sequence, but a driver that 
were to try to play with interrupts at that stage would be broken. It 
can't very well do a enable_irq(), because that would be a MAJOR BUG - it 
would make the whole irq suspend thing pointless, since now interrupts 
would start to happen exactly where they must not happen!

			Linus
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