[src/trunk]: src/sys/netinet6 Remove unnecessary NULL checks

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

details:   https://anonhg.NetBSD.org/src/rev/ff6751f5ec9d
branches:  trunk
changeset: 818764:ff6751f5ec9d
user:      ozaki-r <ozaki-r%NetBSD.org@localhost>
date:      Mon Oct 31 02:50:31 2016 +0000

description:
Remove unnecessary NULL checks

diffstat:

 sys/netinet6/in6_src.c |  111 +++++++++++++++++++++---------------------------
 1 files changed, 49 insertions(+), 62 deletions(-)

diffs (180 lines):

diff -r 6a78602c21a0 -r ff6751f5ec9d sys/netinet6/in6_src.c
--- a/sys/netinet6/in6_src.c    Mon Oct 31 02:44:54 2016 +0000
+++ b/sys/netinet6/in6_src.c    Mon Oct 31 02:50:31 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: in6_src.c,v 1.70 2016/08/26 20:29:31 roy Exp $ */
+/*     $NetBSD: in6_src.c,v 1.71 2016/10/31 02:50:31 ozaki-r Exp $     */
 /*     $KAME: in6_src.c,v 1.159 2005/10/19 01:40:32 t-momose Exp $     */
 
 /*
@@ -66,7 +66,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: in6_src.c,v 1.70 2016/08/26 20:29:31 roy Exp $");
+__KERNEL_RCSID(0, "$NetBSD: in6_src.c,v 1.71 2016/10/31 02:50:31 ozaki-r Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -590,11 +590,14 @@
        struct sockaddr_in6 *sin6_next;
        struct in6_pktinfo *pi = NULL;
        struct in6_addr *dst;
-       struct psref local_psref;
-#define PSREF  ((psref == NULL) ? &local_psref : psref)
+       union {
+               struct sockaddr         dst;
+               struct sockaddr_in6     dst6;
+       } u;
 
-       KASSERT((retifp != NULL && psref != NULL) ||
-               (retifp == NULL && psref == NULL));
+       KASSERT(ro != NULL);
+       KASSERT(retifp != NULL && psref != NULL);
+       KASSERT(retrt != NULL);
 
        dst = &dstsock->sin6_addr;
 
@@ -614,17 +617,16 @@
        /* If the caller specify the outgoing interface explicitly, use it. */
        if (opts && (pi = opts->ip6po_pktinfo) != NULL && pi->ipi6_ifindex) {
                /* XXX boundary check is assumed to be already done. */
-               ifp = if_get_byindex(pi->ipi6_ifindex, PSREF);
+               ifp = if_get_byindex(pi->ipi6_ifindex, psref);
                if (ifp != NULL &&
-                   (norouteok || retrt == NULL ||
-                   IN6_IS_ADDR_MULTICAST(dst))) {
+                   (norouteok || IN6_IS_ADDR_MULTICAST(dst))) {
                        /*
                         * we do not have to check or get the route for
                         * multicast.
                         */
                        goto done;
                } else {
-                       if_put(ifp, PSREF);
+                       if_put(ifp, psref);
                        ifp = NULL;
                        goto getroute;
                }
@@ -635,7 +637,7 @@
         * interface for the address is specified by the caller, use it.
         */
        if (IN6_IS_ADDR_MULTICAST(dst) && mopts != NULL) {
-               ifp = if_get_byindex(mopts->im6o_multicast_if_index, PSREF);
+               ifp = if_get_byindex(mopts->im6o_multicast_if_index, psref);
                if (ifp != NULL)
                        goto done; /* we do not need a route for multicast. */
        }
@@ -671,7 +673,7 @@
                ifp = rt->rt_ifp;
                if (ifp != NULL) {
                        if (!if_is_deactivated(ifp))
-                               if_acquire_NOMPSAFE(ifp, PSREF);
+                               if_acquire_NOMPSAFE(ifp, psref);
                        else
                                ifp = NULL;
                }
@@ -690,52 +692,42 @@
         * a new one.  Note that we should check the address family of the
         * cached destination, in case of sharing the cache with IPv4.
         */
-       if (ro != NULL) {
-               union {
-                       struct sockaddr         dst;
-                       struct sockaddr_in6     dst6;
-               } u;
+       u.dst6 = *dstsock;
+       u.dst6.sin6_scope_id = 0;
+       rt = rtcache_lookup1(ro, &u.dst, clone);
+
+       /*
+        * do not care about the result if we have the nexthop
+        * explicitly specified.
+        */
+       if (opts && opts->ip6po_nexthop)
+               goto done;
 
-               /* No route yet, so try to acquire one */
-               u.dst6 = *dstsock;
-               u.dst6.sin6_scope_id = 0;
-               rt = rtcache_lookup1(ro, &u.dst, clone);
+       if (rt == NULL)
+               error = EHOSTUNREACH;
+       else {
+               if_put(ifp, psref);
+               ifp = rt->rt_ifp;
+               if (ifp != NULL) {
+                       if (!if_is_deactivated(ifp))
+                               if_acquire_NOMPSAFE(ifp, psref);
+                       else
+                               ifp = NULL;
+               }
+       }
 
-               /*
-                * do not care about the result if we have the nexthop
-                * explicitly specified.
-                */
-               if (opts && opts->ip6po_nexthop)
-                       goto done;
-
-               if (rt == NULL)
+       /*
+        * Check if the outgoing interface conflicts with
+        * the interface specified by ipi6_ifindex (if specified).
+        * Note that loopback interface is always okay.
+        * (this may happen when we are sending a packet to one of
+        *  our own addresses.)
+        */
+       if (opts && opts->ip6po_pktinfo && opts->ip6po_pktinfo->ipi6_ifindex) {
+               if (!(ifp->if_flags & IFF_LOOPBACK) &&
+                   ifp->if_index != opts->ip6po_pktinfo->ipi6_ifindex) {
                        error = EHOSTUNREACH;
-               else {
-                       if_put(ifp, PSREF);
-                       ifp = rt->rt_ifp;
-                       if (ifp != NULL) {
-                               if (!if_is_deactivated(ifp))
-                                       if_acquire_NOMPSAFE(ifp, PSREF);
-                               else
-                                       ifp = NULL;
-                       }
-               }
-
-               /*
-                * Check if the outgoing interface conflicts with
-                * the interface specified by ipi6_ifindex (if specified).
-                * Note that loopback interface is always okay.
-                * (this may happen when we are sending a packet to one of
-                *  our own addresses.)
-                */
-               if (opts && opts->ip6po_pktinfo &&
-                   opts->ip6po_pktinfo->ipi6_ifindex) {
-                       if (!(ifp->if_flags & IFF_LOOPBACK) &&
-                           ifp->if_index !=
-                           opts->ip6po_pktinfo->ipi6_ifindex) {
-                               error = EHOSTUNREACH;
-                               goto done;
-                       }
+                       goto done;
                }
        }
 
@@ -750,15 +742,10 @@
        if (error == EHOSTUNREACH)
                IP6_STATINC(IP6_STAT_NOROUTE);
 
-       if (retifp != NULL)
-               *retifp = ifp;
-       else
-               if_put(ifp, PSREF);
-       if (retrt != NULL)
-               *retrt = rt;    /* rt may be NULL */
+       *retifp = ifp;
+       *retrt = rt;    /* rt may be NULL */
 
        return (error);
-#undef PSREF
 }
 
 static int