From b88f0e90f18832f5007f2921f0541045f48db6fc Mon Sep 17 00:00:00 2001
From: Sascha Wildner <saw@online.de>
Date: Fri, 4 Apr 2014 20:20:10 +0200
Subject: [PATCH] kernel/802_11: Release the WLAN serializer around
 if_detach().

This should fix all crashes we are seeing upon kldunload of WLAN
drivers.

In-discussion-with-and-tested-by: ivadasz, jh32, sephe
---
 sys/netproto/802_11/wlan/ieee80211.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/netproto/802_11/wlan/ieee80211.c b/sys/netproto/802_11/wlan/ieee80211.c
index 9d4036e29b..5fea6685b5 100644
--- a/sys/netproto/802_11/wlan/ieee80211.c
+++ b/sys/netproto/802_11/wlan/ieee80211.c
@@ -332,7 +332,9 @@ ieee80211_ifdetach(struct ieee80211com *ic)
 	struct ifnet *ifp = ic->ic_ifp;
 	struct ieee80211vap *vap;
 
+	wlan_serialize_exit();
 	if_detach(ifp);
+	wlan_serialize_enter();
 
 	while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
 		ieee80211_vap_destroy(vap);
-- 
2.41.0