Pawel Jakub Dawidek 171f6b3a34 Use the topology lock to protect list of providers while withering them.
It is possible that provider is destroyed while we are iterating over the
list.

Reported by:	Brian Parkison <parkison@panzura.com>
Discussed with:	phk
MFC after:	1 week
2012-09-22 12:41:49 +00:00
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