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through the interrupt pipe; during exploration check only the ports where we got such a notification. This speeds up things. (I believe we should go a step further and use a thread per hub instead of per bus. If power management gets implemented, we should be able to react quickly on a resume event.) Try to simplify the logics in the explore function a bit. (The reattach thing was hacked in badly, not sure whether I broke it. Only used by if_atu.) Clean up some dead code.