Remove IFF_NEEDSGIANT, a compatibility infrastructure introduced

in FreeBSD 5.x to allow network device drivers to run with Giant
despite the network stack being Giant-free.  This significantly
simplifies calls into ioctl() on network interfaces, especially
in the multicast code, as well as eliminates deferred invocation
of interface if_start routines.

Disable the build on device drivers still depending on
IFF_NEEDSGIANT as they no longer compile.  They will be removed
in a few weeks if they haven't been made MPSAFE in that time.
Disabled drivers:

        if_ar
        if_axe
        if_aue
        if_cdce
        if_cue
        if_kue
        if_ray
        if_rue
        if_rum
        if_sr
        if_udav
        if_ural
        if_zyd

Drivers that were already disabled because of tty changes:

        if_ppp
        if_sl

Discussed on:	arch@

1 files changed, 0 insertions, 2 deletions

diff --git a/sys/netinet6/in6_ifattach.c b/sys/netinet6/in6_ifattach.c
index 4950549..68b3542 100644
--- a/sys/netinet6/in6_ifattach.c
+++ b/sys/netinet6/in6_ifattach.c
@@ -906,10 +906,8 @@ in6_purgemaddrs(struct ifnet *ifp)
 	struct in6_multi *in6m;
 	struct in6_multi *oin6m;
 
-	IFF_LOCKGIANT(ifp);
 	LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) {
 		if (in6m->in6m_ifp == ifp)
 			in6_delmulti(in6m);
 	}
-	IFF_UNLOCKGIANT(ifp);
 }