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hyperv/vmbus: Fix the racy channel close.
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Authored by sepherosa_gmail.com on Jul 5 2016, 3:16 PM.
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Summary
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.

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rS FreeBSD src repository - subversion
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sepherosa_gmail.com retitled this revision from to hyperv/vmbus: Fix the racy channel close..
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