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| author | Eric Dumazet <edumazet@google.com> | 2017-10-23 16:17:46 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-24 17:54:19 +0900 |
| commit | 752a92927e97e88096394dac3f10d12a58555254 (patch) | |
| tree | 7cd95fcbbd7b56d7e99f10070460e3782dd86e81 /net/ipv6/addrconf.c | |
| parent | 56fc709b7a9fe191173dc772a881e180458db517 (diff) | |
| download | linux-stable-752a92927e97e88096394dac3f10d12a58555254.tar.gz linux-stable-752a92927e97e88096394dac3f10d12a58555254.tar.bz2 linux-stable-752a92927e97e88096394dac3f10d12a58555254.zip | |
ipv6: addrconf: factorize inet6_addr_hash() call
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>
Diffstat (limited to 'net/ipv6/addrconf.c')
| -rw-r--r-- | net/ipv6/addrconf.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 9228030e3497..c1a5028f394c 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -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; |