linux-kernel - Re: [PATCH] PM: Add helper to mark last busy and autosuspend

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Message-ID: <Pine.LNX.4.44L0.1409161156560.1166-100000@iolanthe.rowland.org>
Date:	Tue, 16 Sep 2014 11:58:13 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Vinod Koul <vinod.koul@...el.com>
cc:	"Subhransu S. Prusty" <subhransu.s.prusty@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM: Add helper to mark last busy and autosuspend

On Tue, 16 Sep 2014, Vinod Koul wrote:

> On Tue, Sep 16, 2014 at 10:27:53AM -0400, Alan Stern wrote:
> > On Tue, 16 Sep 2014, Subhransu S. Prusty wrote:
> > 
> > > pm_runtime_mark_last_busy and pm_runtime_put_autosuspend are used together
> > > in quite a lot of places. Add a helper for these.
> > > 
> > > Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@...el.com>
> > > ---
> > >  include/linux/pm_runtime.h | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
> > > index 367f49b..256ec50 100644
> > > --- a/include/linux/pm_runtime.h
> > > +++ b/include/linux/pm_runtime.h
> > > @@ -277,4 +277,10 @@ static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
> > >  	__pm_runtime_use_autosuspend(dev, false);
> > >  }
> > >  
> > > +static inline int pm_runtime_last_busy_and_autosuspend(struct device *dev)
> > > +{
> > > +	pm_runtime_mark_last_busy(dev);
> > > +	return pm_runtime_put_autosuspend(dev);
> > > +}
> > > +
> > >  #endif
> > 
> > What's the advantage?  Removing a few bytes of source code?  There will 
> > no change to the object code.  (Not to mention that your patch didn't 
> > actually change _any_ of the places where both routines get called!)
> Yes we didnt change users, as we need this for one of our drivers we are
> trying to push.

Why do you need it?  Just change your driver to call

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);

instead of

	pm_runtime_last_busy_and_autosuspend(dev);

Or create a subroutine in your driver to do this.

Alan Stern

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