kldload uhci lockup

[Jakub Lach]

I observed that following could cause
machine lockup since at least 8-CURRENT.

Now I'm on 9-STABLE

No usb in kernel, attached mouse pointer. 

# kldload usb ums ehci
# kldload uhci

or 

# kldload uhci usb ums ehci

uhci is required for working mouse.

Can anyone confirm? Please
test few different iterations, as 
it's probably not easily reproducible.

Most times nothing happens, if machine
slow downs to crawl/halt , it's on uhci 
loading stage I suppose. 

Best if somebody could pin this down 
on their machine, as I don't have time
to debug this now/would have to alter
my configuration considerably.

best regards, 
- Jakub Lach

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