K 10
svn:author
V 5
sephe
K 8
svn:date
V 27
2016-11-24T07:35:16.527501Z
K 7
svn:log
V 416
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

END