Re: Runtime PM for PCI-based USB host controllers

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On Wednesday 26 May 2010, Alan Stern wrote:
> On Wed, 26 May 2010, Rafael J. Wysocki wrote:
> 
> > At this point, yes.  At least drivers should leave the devices active and
> > let the core power take care of them.
> 
> What if the driver is unbound while the device is suspended?  It seems 
> pretty awkward.  The release method would have to do:
> 
> 	pm_runtime_get_sync(dev);
> 	pm_runtime_disable(dev);
> 	pm_runtime_set_suspended(dev);
> 	pm_runtime_put_noidle(dev);

That's correct, but as I said I don't think it's safe to do anything else in
general at this point (please remember that it must cooperate with system
suspend/resume).

This still is a work in progress, though, so if you have an idea how to improve
it, I surely won't object. :-)

Rafael
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