K 10
svn:author
V 2
bz
K 8
svn:date
V 27
2020-09-29T20:46:25.050082Z
K 7
svn:log
V 486
rtwn: narrow the epoch area

Rather than placing the epoch around the entire receive loop which
might call into rtwn_rx_frame() and USB and sleep, split the loop
into two[1] and leave us with one unlock/lock cycle as well.

PR:		249925
Reported by:	thj, (rkoberman gmail.com)
Tested by:	thj
Suggested by:	adrian [1]
Reviewed by:	adrian
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation (initially, paniced my iwl lab host)
Differential Revision:	https://reviews.freebsd.org/D26554

END