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ipv6: addrconf: factorize inet6_addr_hash() call

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ipv6_add_addr_hash() can compute the hash value outside of
locked section and pass it to ipv6_chk_same_addr().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-10-23 16:17:46 -07:00 committed by David S. Miller
parent 56fc709b7a
commit 752a92927e
1 changed files with 5 additions and 10 deletions
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15
net/ipv6/addrconf.c
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@ -956,9 +956,8 @@ static u32 inet6_addr_hash(const struct in6_addr *addr)
}
static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
struct net_device *dev)
struct net_device *dev, unsigned int hash)
{
unsigned int hash = inet6_addr_hash(addr);
struct inet6_ifaddr *ifp;
hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
@ -974,23 +973,19 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
{
unsigned int hash;
unsigned int hash = inet6_addr_hash(&ifa->addr);
int err = 0;
spin_lock(&addrconf_hash_lock);
/* Ignore adding duplicate addresses on an interface */
if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev)) {
if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
ADBG("ipv6_add_addr: already assigned\n");
err = -EEXIST;
goto out;
} else {
hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
}
/* Add to big hash table */
hash = inet6_addr_hash(&ifa->addr);
hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
out:
spin_unlock(&addrconf_hash_lock);
return err;