[IPV6]: Acquire addrconf_hash_lock for read in addrconf_verify(...)

[linux-beck.git] / net / ipv6 / addrconf.c

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index ddcf7754eec2dd69d65c3ddabf91edad39277314..a16064ba0caf2bee3bcc87ffa111811d44927d60 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1045,9 +1045,10 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
                        }
 #endif
                        /* Rule 8: Use longest matching prefix */
-                       if (hiscore.rule < 8)
+                       if (hiscore.rule < 8) {
                                hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
-                       score.rule++;
+                               hiscore.rule++;
+                       }
                        score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
                        if (score.matchlen > hiscore.matchlen) {
                                score.rule = 8;
@@ -2626,7 +2627,7 @@ static void addrconf_verify(unsigned long foo)
        for (i=0; i < IN6_ADDR_HSIZE; i++) {
 
 restart:
-               write_lock(&addrconf_hash_lock);
+               read_lock(&addrconf_hash_lock);
                for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
                        unsigned long age;
 #ifdef CONFIG_IPV6_PRIVACY
@@ -2648,7 +2649,7 @@ restart:
                        if (age >= ifp->valid_lft) {
                                spin_unlock(&ifp->lock);
                                in6_ifa_hold(ifp);
-                               write_unlock(&addrconf_hash_lock);
+                               read_unlock(&addrconf_hash_lock);
                                ipv6_del_addr(ifp);
                                goto restart;
                        } else if (age >= ifp->prefered_lft) {
@@ -2667,7 +2668,7 @@ restart:
 
                                if (deprecate) {
                                        in6_ifa_hold(ifp);
-                                       write_unlock(&addrconf_hash_lock);
+                                       read_unlock(&addrconf_hash_lock);
 
                                        ipv6_ifa_notify(0, ifp);
                                        in6_ifa_put(ifp);
@@ -2685,7 +2686,7 @@ restart:
                                                in6_ifa_hold(ifp);
                                                in6_ifa_hold(ifpub);
                                                spin_unlock(&ifp->lock);
-                                               write_unlock(&addrconf_hash_lock);
+                                               read_unlock(&addrconf_hash_lock);
                                                ipv6_create_tempaddr(ifpub, ifp);
                                                in6_ifa_put(ifpub);
                                                in6_ifa_put(ifp);
@@ -2702,7 +2703,7 @@ restart:
                                spin_unlock(&ifp->lock);
                        }
                }
-               write_unlock(&addrconf_hash_lock);
+               read_unlock(&addrconf_hash_lock);
        }
 
        addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;