linux-kernel - Re: [PATCH 5] PM: Update comments describing device power management callbacks

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Date:	Wed, 23 Nov 2011 11:28:03 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Ming Lei <tom.leiming@...il.com>
Subject: Re: [PATCH 5] PM: Update comments describing device power management
 callbacks

On Wed, 23 Nov 2011, Rafael J. Wysocki wrote:

> On Tuesday, November 22, 2011, Alan Stern wrote:
> > On Tue, 22 Nov 2011, Rafael J. Wysocki wrote:
> > 
> > > > The same data structure (dev_pm_ops) is used for both drivers and
> > > > subsystems.  Therefore the comments should be directed toward both
> > > > driver writers and subsystem writers.
> > > 
> > > I don't quite agree.  Trying to do so would turn that comment into a lengthy
> > > document and there's no room for anything like that in the header file.
> > 
> > That's a good point.
> > 
> > > Perhaps I'll just modify the comment to say when the callbacks are executed
> > > without specifying what the specific callbacks are supposed to do (because
> > > that may vary from one subsystem to another and even between different
> > > drivers belonging to the same subsystem).  If PM domains are taken into
> > > account, it gets even more complicated.
> > 
> > Yes, a minimal description would be good, along with a pointer to the 
> > Documentation/power files.
> 
> Well, the one below is not exactly minimal, but I think it doesn't go too
> far at least.

Yes, I like this version better.

Alan Stern

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