K 10
svn:author
V 5
sephe
K 8
svn:date
V 27
2016-07-14T07:59:01.425363Z
K 7
svn:log
V 381
hyperv/vmbus: Fix the racy channel close.

It is not safe to iterate the sub-channel list w/o lock on the
close path, while it's even more difficult to hold the lock
and iterate the sub-channel list.  We leverage the
vmbua_{get,rel}_subchan() functions to solve this dilemma.

MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D7112

END