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

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Date:	Tue, 16 Sep 2014 13:22:11 -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:

> > > > 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.
> Well since this is common why not add a helper in framework!

You said this was common, but you didn't change any of the other places
these routines get used.  I asked why and you didn't asnwer; all you
said was that you needed it for one of your drivers.

I then pointed out that you don't need it.  You didn't asnwer.

I asked what advantage this change brings.  You didn't answer.

Alan Stern

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