[src/trunk]: src/sys/net Restructure rtcache_lookup2 to make it clear what it...

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

details:   https://anonhg.NetBSD.org/src/rev/d8246c7cf364
branches:  trunk
changeset: 807255:d8246c7cf364
user:      ozaki-r <ozaki-r%NetBSD.org@localhost>
date:      Fri Apr 03 05:44:13 2015 +0000

description:
Restructure rtcache_lookup2 to make it clear what it does

No functional change.

diffstat:

 sys/net/route.c |  32 ++++++++++++++++++++------------
 1 files changed, 20 insertions(+), 12 deletions(-)

diffs (57 lines):

diff -r 2e0c0f614fdc -r d8246c7cf364 sys/net/route.c
--- a/sys/net/route.c   Fri Apr 03 01:09:42 2015 +0000
+++ b/sys/net/route.c   Fri Apr 03 05:44:13 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: route.c,v 1.137 2015/03/26 04:38:17 ozaki-r Exp $      */
+/*     $NetBSD: route.c,v 1.138 2015/04/03 05:44:13 ozaki-r Exp $      */
 
 /*-
  * Copyright (c) 1998, 2008 The NetBSD Foundation, Inc.
@@ -94,7 +94,7 @@
 #include "opt_route.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: route.c,v 1.137 2015/03/26 04:38:17 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: route.c,v 1.138 2015/04/03 05:44:13 ozaki-r Exp $");
 
 #include <sys/param.h>
 #include <sys/kmem.h>
@@ -1420,20 +1420,28 @@
        struct rtentry *rt = NULL;
 
        odst = rtcache_getdst(ro);
+       if (odst == NULL)
+               goto miss;
 
-       if (odst == NULL)
-               ;
-       else if (sockaddr_cmp(odst, dst) != 0)
+       if (sockaddr_cmp(odst, dst) != 0) {
                rtcache_free(ro);
-       else if ((rt = rtcache_validate(ro)) == NULL)
+               goto miss;
+       }
+
+       rt = rtcache_validate(ro);
+       if (rt == NULL) {
                rtcache_clear(ro);
+               goto miss;
+       }
 
-       if (rt == NULL) {
-               *hitp = 0;
-               if (rtcache_setdst(ro, dst) == 0)
-                       rt = _rtcache_init(ro, clone);
-       } else
-               *hitp = 1;
+       *hitp = 1;
+       rtcache_invariants(ro);
+
+       return rt;
+miss:
+       *hitp = 0;
+       if (rtcache_setdst(ro, dst) == 0)
+               rt = _rtcache_init(ro, clone);
 
        rtcache_invariants(ro);