src: Simplify bridge_rtnode_insert (NFC)

[ozaki-r <ozaki-r%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e653683521b6
branches:  trunk
changeset: 318313:e653683521b6
user:      ozaki-r <ozaki-r%NetBSD.org@localhost>
date:      Wed Apr 18 03:49:44 2018 +0000
description:
Simplify bridge_rtnode_insert (NFC)

diffstat:

 sys/net/if_bridge.c |  43 ++++++++++++++-----------------------------
 1 files changed, 14 insertions(+), 29 deletions(-)

diffs (71 lines):

diff -r 00d2dd15862d -r e653683521b6 sys/net/if_bridge.c
--- a/sys/net/if_bridge.c       Wed Apr 18 03:47:28 2018 +0000
+++ b/sys/net/if_bridge.c       Wed Apr 18 03:49:44 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_bridge.c,v 1.150 2018/04/18 03:47:28 ozaki-r Exp $  */
+/*     $NetBSD: if_bridge.c,v 1.151 2018/04/18 03:49:44 ozaki-r Exp $  */
 
 /*
  * Copyright 2001 Wasabi Systems, Inc.
@@ -80,7 +80,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.150 2018/04/18 03:47:28 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.151 2018/04/18 03:49:44 ozaki-r Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_bridge_ipf.h"
@@ -2422,40 +2422,25 @@
 static int
 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
 {
-       struct bridge_rtnode *lbrt;
+       struct bridge_rtnode *lbrt, *prev = NULL;
        uint32_t hash;
-       int dir;
 
        KASSERT(BRIDGE_RT_LOCKED(sc));
 
        hash = bridge_rthash(sc, brt->brt_addr);
-
-       lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
-       if (lbrt == NULL) {
-               LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
-               goto out;
-       }
-
-       do {
-               dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN);
+       LIST_FOREACH(lbrt, &sc->sc_rthash[hash], brt_hash) {
+               int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN);
                if (dir == 0)
                        return EEXIST;
-               if (dir > 0) {
-                       LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
-                       goto out;
-               }
-               if (LIST_NEXT(lbrt, brt_hash) == NULL) {
-                       LIST_INSERT_AFTER(lbrt, brt, brt_hash);
-                       goto out;
-               }
-               lbrt = LIST_NEXT(lbrt, brt_hash);
-       } while (lbrt != NULL);
-
-#ifdef DIAGNOSTIC
-       panic("bridge_rtnode_insert: impossible");
-#endif
-
- out:
+               if (dir > 0)
+                       break;
+               prev = lbrt;
+       }
+       if (prev == NULL)
+               LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
+       else
+               LIST_INSERT_AFTER(prev, brt, brt_hash);
+
        LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
        sc->sc_brtcnt++;