On Sun, 19 Aug 2012, Sebastian Andrzej Siewior wrote:
> If USB2 host controller probes fine but USB3 does not then we don't
> remove the USB controller properly and lock up the system while the HUB
> code will try to enumerate the USB2 controller and access memory which
> is no longer available in case the dummy_hcd was compiled as a module.
>
> This is a problem since 448b6eb1 ("USB: Make sure to fetch the BOS desc
> for roothubs.) if used in USB3 mode because dummy does not provide this
> descriptor and explodes later.
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
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