I'm not sure this "shared_hcd" pointer is needed.  Does it ever get 

This doesn't seem like the right approach.  The creation of a secondary 
usb_hcd should be handled by the driver that needs it; it isn't such a 
common activity that we need to implement it in the USB core.  In 

Didn't we agree earlier that xhci-hcd needs to register its USB-2 root 


Do you really need to set hcd->primary_hcd to point to hcd itself?  My 
inclination would be to leave it unset.

Alan Stern

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