On Fri, 20 Aug 2004, David Brownell wrote:

> > What about hubs, which are after all a very special sort of device?  You
> > have structured the code so that children get suspended when the hub's
> > interface is suspended, even though the hub device may be left active.
> 
> I sometimes thing of that as a missing feature:  when all its children are
> suspended, the device itself should probably suspend too.   That'd be
> a useful policy even if it were just internal to the hub driver.

But it would have visible consequences in userspace.  A user could suspend 
all the children of a hub, then try to wake one of them up, only to find 
that the resume fails because the hub is asleep!

Alan Stern



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