Maksim Yevmenkin 50e71c31aa Clean up ng_ubt2. Get rid of excessive use of NG_NODE_REF/UNREF().
Make detach() completely synchronous. Properly handle stalled USB
transfers (use internal mechanism instead of submitting own control
transfers). Rename/remove a couple of variables and update comments.
This work was done in close collaboration with HPS.

Reviewed by:	HPS
2009-01-26 20:59:41 +00:00
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