From f5f1525321856d675b6108fe761f633045b1702c Mon Sep 17 00:00:00 2001
From: Ian Dowse <iedowse@FreeBSD.org>
Date: Thu, 27 Mar 2008 18:02:30 +0000
Subject: [PATCH] Add IFF_NEEDSGIANT to IFF_CANTCHANGE, to prevent user-level
 code from clearing the IFF_NEEDSGIANT flag on Giant-locked interfaces. In
 particular, wpa_supplicant was doing this on USB interfaces, causing panics
 when Giant-locked code was then called without Giant.

Submitted by:	Alexey Popov
Reviewed by:	rwatson
MFC after:	3 days
---
 sys/net/if.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/net/if.h b/sys/net/if.h
index 2d1700a1d61f..95566fb9f941 100644
--- a/sys/net/if.h
+++ b/sys/net/if.h
@@ -163,7 +163,8 @@ struct if_data {
 /* flags set internally only: */
 #define	IFF_CANTCHANGE \
 	(IFF_BROADCAST|IFF_POINTOPOINT|IFF_DRV_RUNNING|IFF_DRV_OACTIVE|\
-	    IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_SMART|IFF_PROMISC)
+	    IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_SMART|IFF_PROMISC|\
+	    IFF_NEEDSGIANT)
 
 /*
  * Values for if_link_state.