Stephen Hurd f3e1324b41 Separate list manipulation locking from state change in multicast
Multicast incorrectly calls in to drivers with a mutex held causing drivers
to have to go through all manner of contortions to use a non sleepable lock.
Serialize multicast updates instead.

Submitted by:	mmacy <mmacy@mattmacy.io>
Reviewed by:	shurd, sbruno
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D14969
2018-05-02 19:36:29 +00:00
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