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authorYan Zheng <yanzheng@21cn.com>2005-11-20 13:42:20 -0800
committerDavid S. Miller <davem@davemloft.net>2005-11-20 13:42:20 -0800
commit5d5780df23537ad0db72267fe11103d2c23d9b2a (patch)
tree3a442b265c3494072d4cdf15c8d3a38ada33a734
parent4909724b5dee8fb7c52bbe90afa40c65b17be9eb (diff)
[IPV6]: Acquire addrconf_hash_lock for read in addrconf_verify(...)
addrconf_verify(...) only traverse address hash table when addrconf_hash_lock is held for writing, and it may hold addrconf_hash_lock for a long time. So I think it's better to acquire addrconf_hash_lock for reading instead of writing Signed-off-by: Yan Zheng <yanzheng@21cn.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv6/addrconf.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 56a09a4ac41..a16064ba0ca 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2627,7 +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
@@ -2649,7 +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) {
@@ -2668,7 +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);
@@ -2686,7 +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);
@@ -2703,7 +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;