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

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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>
This commit is contained in:
Yan Zheng 2005-11-20 13:42:20 -08:00 committed by David S. Miller
parent 4909724b5d
commit 5d5780df23
1 changed files with 5 additions and 5 deletions
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10
net/ipv6/addrconf.c
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@ -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;