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/net/if_bridge.c b/sys/net/if_bridge.c
index da73543..1e9d956 100644
--- a/sys/net/if_bridge.c
+++ b/sys/net/if_bridge.c
@@ -829,9 +829,7 @@ bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
 	ifr.ifr_reqcap = set;
 
 	if (ifp->if_capenable != set) {
-		IFF_LOCKGIANT(ifp);
 		error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
-		IFF_UNLOCKGIANT(ifp);
 		if (error)
 			if_printf(sc->sc_ifp,
 			    "error setting interface capabilities on %s\n",