linux-kernel - RE: [PATCH 2/3] genirq: Do not consider the irqs with disabling and IRQF_NO

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Date:	Tue, 12 Mar 2013 00:21:56 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/3] genirq: Do not consider the irqs with disabling and
 IRQF_NO_SUSPEND



> -----Original Message-----
> From: Thomas Gleixner [mailto:tglx@...utronix.de]
> Sent: Tuesday, March 12, 2013 5:24 AM
> To: Liu, Chuansheng
> Cc: mingo@...hat.com; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 2/3] genirq: Do not consider the irqs with disabling and
> IRQF_NO_SUSPEND
> 
> On Tue, 12 Mar 2013, Chuansheng Liu wrote:
> > According to commit 9c6079aa1bf(genirq: Do not consider disabled
> > wakeup irqs), we should not break the suspend when one irq is pending
> > but has been disabled before suspending.
> >
> > But there is another case missed, that one irq with flag IRQF_NO_SUSPEND,
> > which has been disabled before suspending, and irq pending there,
> > in this case, we still should not break the suspending, otherwise,
> > the suspend abort over and over.
> >
> > Here also checking if the desc->istate & IRQS_SUSPENDED is true.
> 
> So what you are saying is:
> 
> If an interrupt which is marked IRQF_NO_SUSPEND has been disabled
> before suspend invocation then desc->depth is 1 and therefor it should
> not be checked for IRQS_PENDING in check_wakeup_irqs().
> 
> Makes sense, though the changelog needs to be more clear and the code
> wants to have a proper comment.
Thanks, will copy your saying into comments, and send patch V2.

> 
> Thanks,
> 
> 	tglx
> 
> > Signed-off-by: liu chuansheng <chuansheng.liu@...el.com>
> > ---
> >  kernel/irq/pm.c |    3 ++-
> >  1 files changed, 2 insertions(+), 1 deletions(-)
> >
> > diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
> > index cb228bf..1470c1b 100644
> > --- a/kernel/irq/pm.c
> > +++ b/kernel/irq/pm.c
> > @@ -109,7 +109,8 @@ int check_wakeup_irqs(void)
> >  		 * can abort suspend.
> >  		 */
> >  		if (irqd_is_wakeup_set(&desc->irq_data)) {
> > -			if (desc->depth == 1 && desc->istate & IRQS_PENDING)
> > +			if (desc->depth == 1 && (desc->istate & IRQS_PENDING)
> > +				&& (desc->istate & IRQS_SUSPENDED))
> >  				return -EBUSY;
> >  			continue;
> >  		}
> > --
> > 1.7.0.4
> >
> >
> >
> >
--
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