linux-kernel - Re: [patch update] Re: [linux-pm] Run-time PM idea (was: Re: [RFC][PATCH 0/2] PM: Rearrange core suspend code)

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Date:	Fri, 12 Jun 2009 10:25:34 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Oliver Neukum <oliver@...kum.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch update] Re: [linux-pm] Run-time PM idea (was: Re:
 [RFC][PATCH 0/2] PM: Rearrange core suspend code)

On Thu, 11 Jun 2009, Rafael J. Wysocki wrote:

> > > > It might also be nice to make sure that the driver core autoresumes a 
> > > > device before probing it and autosuspends a device (after some 
> > > > reasonable delay) after unbinding its driver.
> > > 
> > > Agreed.
> > 
> > This is another case where a usage counter comes in handy.  The driver
> > core resumes the device and increments the counter -- thus preventing
> > any unwanted autosuspends -- before making the probe and remove calls.
> 
> I like this idea.
> 
> BTW, where exactly the counter should be increased in that case?
> 
> I thought of driver_probe_device(), but is it sufficient?  Or is there a better
> place?

That's okay.  Or you could put it in really_probe().  Either one.

Alan Stern

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