Re: [patch update] PM: Introduce core framework for run-time PM ofI/O devices

From: Alan Stern
Date: Tue Jun 16 2009 - 10:30:34 EST

On Tue, 16 Jun 2009, Rafael J. Wysocki wrote:

> > Since pm_runtime_resume() takes care of powering up the parent, there's
> > no need for pm_request_resume() to worry about it also.
> But still it won't hurt to do it IMO, because the parents are then going to be
> resumed before our pm_runtime_resume() is called.

It's extra code that isn't needed. In essence, you are trading code
space for a shorter runtime stack.

> > The documentation should mention that the runtime_suspend method is
> > supposed to enable remote wakeup if it as available and if
> > device_may_wakeup(dev) is true.
> Well, I thought that was obvious. :-)

Sometimes it doesn't hurt to state the obvious! :-)

Alan Stern

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