From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 1/10] PM: Rework handling of interrupts during suspend-resume (rev. 5)
Date: Wed, 11 Mar 2009 23:13:36 +0100
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Cc: Thomas Gleixner <tglx@linutronix.de>,
       pm list <linux-pm@lists.linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Jeremy Fitzhardinge <jeremy@goop.org>, Len Brown <lenb@kernel.org>,
       Jesse Barnes <jbarnes@virtuousgeek.org>, Frans Pop <elendil@planet.nl>,
       Arve =?iso-8859-1?q?Hj=F8nnev=E5g?= <arve@android.com>
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On Wednesday 11 March 2009, Linus Torvalds wrote:
> 
> On Wed, 11 Mar 2009, Thomas Gleixner wrote:
> > 
> > I'm not worried about nested ones.
> 
> Then you shouldn't be worried about IRQ_SUSPENDED at all, since that one 
> increments the disabled depth count.
> 
> So _all_ disable/enable_irq calls will by definition be nested inside 
> IRQ_SUSPENDED. 

Still, if there's an unbalanced irq_enable() between suspend_device_irqs()
and resume_device_irqs(), we'll not detect it immediately, but only in
resume_device_irqs().  It would be better if the unbalanced call failed in that
case IMHO.

Rafael
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