Hans Petter Selasky 88d57e9eac Resolve deadlock between epoch(9) and various network interface
SX-locks, during if_purgeaddrs(), by not allowing to hold the epoch
read lock over typical network IOCTL code paths. This is a regression
issue after r334305.

Reviewed by:		ae (network)
Differential revision:	https://reviews.freebsd.org/D17647
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2018-10-22 13:25:26 +00:00
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