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authorEric Dumazet <eric.dumazet@gmail.com>2009-11-02 12:10:39 +0100
committerDavid S. Miller <davem@davemloft.net>2009-11-02 03:42:41 -0800
commit16ba5e8e7c01d2da87ff1d17e83545f164665b5c (patch)
tree0e51da332c65d719ca1b855022027aa9423e7acf /net
parentf1a28eab20076542322fcab3efa016834bd732f2 (diff)
downloadlinux-2.6.34-ux500-16ba5e8e7c01d2da87ff1d17e83545f164665b5c.tar.gz
ipv6: no more dev_put() in inet6_bind()
Avoids touching device refcount in inet6_bind(), thanks to RCU Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/af_inet6.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index b6d05881867..9105b25defe 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -314,6 +314,7 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
if (addr_type != IPV6_ADDR_ANY) {
struct net_device *dev = NULL;
+ rcu_read_lock();
if (addr_type & IPV6_ADDR_LINKLOCAL) {
if (addr_len >= sizeof(struct sockaddr_in6) &&
addr->sin6_scope_id) {
@@ -326,12 +327,12 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
/* Binding to link-local address requires an interface */
if (!sk->sk_bound_dev_if) {
err = -EINVAL;
- goto out;
+ goto out_unlock;
}
- dev = dev_get_by_index(net, sk->sk_bound_dev_if);
+ dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
if (!dev) {
err = -ENODEV;
- goto out;
+ goto out_unlock;
}
}
@@ -342,14 +343,11 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
if (!(addr_type & IPV6_ADDR_MULTICAST)) {
if (!ipv6_chk_addr(net, &addr->sin6_addr,
dev, 0)) {
- if (dev)
- dev_put(dev);
err = -EADDRNOTAVAIL;
- goto out;
+ goto out_unlock;
}
}
- if (dev)
- dev_put(dev);
+ rcu_read_unlock();
}
}
@@ -381,6 +379,9 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
out:
release_sock(sk);
return err;
+out_unlock:
+ rcu_read_unlock();
+ goto out;
}
EXPORT_SYMBOL(inet6_bind);