Sepherosa Ziehau 25641fc705 hyperv/hn: Fix primary channel revocation
Since hypervisor will not drain the TX bufring, once the channels are
revoked:
- Setup vmbus orphan handler properly.
- Make sure that suspension will not wait the TX bufring draining
  forever.
- GC the pending TX descs on detach path, before freeing the busdma
  stuffs.

MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8559
2016-11-24 07:35:16 +00:00
..
2016-11-21 05:21:15 +00:00