Re: [linux-usb-devel] 2.6.10-rc1 OHCI usb error messages

[David Brownell]

On Thursday 28 October 2004 07:46, Alan Stern wrote:
> On Wed, 27 Oct 2004, David Brownell wrote:
> 
> > So:  since it's not being actively used then, why shouldn't the
> > root hub (or any other device) be suspended?  During boot, or at
> > any other time.  So long as it works when you plug in a USB device,
> > it looks to me like everything is behaving quite reasonably.
> 
> The root hub _is_ actively being used during initial probing and 
> enumeration, even though no devices may be plugged into it.  Is it 
> guaranteed that the root hub isn't suspended until after 
> usb_register_root_hub returns?

It's never going to be suspended until after the hub driver has
set everything up -- that's the essential constraint.  Since that
routine is called in a preemptible context, some systems could
end up preempting that call, so it'd suspend before that call
manages to return.  That'd be OK, since everything's set up.

- Dave


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