cem 21be2414d8 netdump: Ref the interface we're attached to
Serialize netdump configuration / deconfiguration, and discard our
configuration when the affiliated interface goes away by monitoring
ifnet_departure_event.

Reviewed by:	markj, with input from vangyzen@ (earlier version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D20206
2019-05-10 23:12:59 +00:00
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