linux-kernel - Re: IRQF_RESUME_EARLY and errors in dpm_suspend

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Date:	Sun, 24 Nov 2013 12:20:25 +0100
From:	Pavel Machek <pavel@....cz>
To:	Heiko Stübner <heiko@...ech.de>,
	rjw@...ysocki.net
Cc:	Laxman Dewangan <ldewangan@...dia.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: IRQF_RESUME_EARLY and errors in dpm_suspend_noirq

Hi!

(Oops, it seems that this thread uses Rafael's old address, and that
it bounces, added address from maintainers to cc.)

								Pavel

On Sat 2013-11-23 22:25:48, Heiko Stübner wrote:
> Hi Laxman,
> 
> Am Mittwoch, 20. November 2013, 10:54:10 schrieb Laxman Dewangan:
> > > I may be blind, but where get the early-irqs resumed in the error
> > > path of dpm_suspend_noirq?
> > > 
> > > When a suspend_noirq callback returns an error, dpm_resume_noirq gets
> > > called, which only calls resume_device_irqs while the
> > > suspend_device_irqs call in dpm_suspend_noirq suspends all irqs. So it
> > > does not seem that the early-irqs get resumed at all in this case.
> > 
> > I also faced same issue in our suspend failure path and posted fix
> > sometime ago as
> > https://lkml.org/lkml/2013/8/13/373
> > 
> > It is still under review.
> 
> From the thread on lkml.org it looks like it got no reaction at all - maybe 
> was just overlooked. So maybe it would be good to re-send it.
> 
> As it is not visible on lkml.org, did you also include stable@...nel.org, as 
> the issue started in 2011?
> 
> > You can try this patch if it resolve the issue.
> 
> Your patch looks a lot more sophisticated than my current band-aid fix :-) by 
> using the fact that irqs won't get resumed twice on their own.
> 
> So if you repost your patch you could add an
> 
> Acked-by: Heiko Stuebner <heiko@...ech.de>
> 
> 
> Heiko

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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