K 10
svn:author
V 9
vmaffione
K 8
svn:date
V 27
2022-02-13T10:49:18.210967Z
K 7
svn:log
V 632
netmap: fix LOR in iflib_netmap_register

In iflib_device_register(), the CTX_LOCK is acquired first and then
IFNET_WLOCK is acquired by ether_ifattach(). However, in netmap_hw_reg()
we do the opposite: IFNET_RLOCK is acquired first, and then CTX_LOCK
is acquired by iflib_netmap_register(). Fix this LOR issue by wrapping
the CTX_LOCK/UNLOCK calls in iflib_device_register with an additional
IFNET_WLOCK. This is safe since the IFNET_WLOCK is recursive.

MFC after:	1 month

(cherry picked from commit e0e12405285b61a724c646b8f8e99e3ec775291e)

Git Hash:   ea25a6af57e0ce1551341e3b1652233cdb11bee1
Git Author: vmaffione@FreeBSD.org
END