linux-kernel - Re: [PATCH v5 1/4] cpu_pm: add syscore

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Date:   Wed, 07 Feb 2018 22:10:33 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Derek Basehore <dbasehore@...omium.org>,
        linux-kernel@...r.kernel.org, Soby.Mathew@....com,
        sudeep.holla@....com, devicetree@...r.kernel.org,
        robh+dt@...nel.org, mark.rutland@....com, linux-pm@...r.kernel.org,
        rafael.j.wysocki@...el.com, tglx@...utronix.de
Subject: Re: [PATCH v5 1/4] cpu_pm: add syscore_suspend error handling

On Wed, 07 Feb 2018 22:01:56 +0000,
Brian Norris wrote:

Hi Brian,

> Hi Marc,
> 
> On Wed, Feb 07, 2018 at 08:57:27AM +0000, Marc Zyngier wrote:
> > On 07/02/18 01:41, Derek Basehore wrote:
> > > If cpu_cluster_pm_enter() fails, cpu_pm_exit() should be called. This
> > > will put the CPU in the correct state to resume from the failure.
> > > 
> > > Signed-off-by: Derek Basehore <dbasehore@...omium.org>
> > > ---
> > >  kernel/cpu_pm.c | 3 +++
> > >  1 file changed, 3 insertions(+)
> > > 
> > > diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
> > > index 67b02e138a47..03bcc0751a51 100644
> > > --- a/kernel/cpu_pm.c
> > > +++ b/kernel/cpu_pm.c
> > > @@ -186,6 +186,9 @@ static int cpu_pm_suspend(void)
> > >  		return ret;
> > >  
> > >  	ret = cpu_cluster_pm_enter();
> > > +	if (ret)
> > > +		cpu_pm_exit();
> > > +
> > >  	return ret;
> > >  }
> > >  
> > > 
> > 
> > It is unclear to me why we need this patch as part of the ITS series. I
> > probably fixes something for you, but I don't see the connection with
> > the other patches.
> 
> Ths bug was noticed (by inspection) along with earlier versions of this
> series, when Derek was still adding new cpu_pm callbacks, and new
> failure modes within the existing callbacks. It's a proper fix to my
> knowledge, but I believe it no longer has any particular relevance to
> this series, since we're not really touching cpu_pm in this series any
> more.

I don't doubt that this is a proper fix, but it has a better chance of
being noticed on its own, rather than buried together with a now
unrelated series.

I'd suggest that when you or Derek respin this series, you don't
include this patch, but instead post it on its own for review.

Thanks,

	M.

-- 
Jazz is not dead, it just smell funny.