diff mbox

[net-next-2.6] ipv6: no more dev_put() in inet6_bind()

Message ID 4AEEBE2F.4020005@gmail.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Eric Dumazet Nov. 2, 2009, 11:10 a.m. UTC 
Avoids touching device refcount in inet6_bind(), thanks to RCU

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
 net/ipv6/af_inet6.c |   17 +++++++++--------
 1 files changed, 9 insertions(+), 8 deletions(-)

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Comments

David Miller Nov. 2, 2009, 11:43 a.m. UTC | #1 
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 02 Nov 2009 12:10:39 +0100

> Avoids touching device refcount in inet6_bind(), thanks to RCU
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

Applied.
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diff mbox

Patch

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index b6d0588..9105b25 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);