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authorHerbert Xu <herbert@gondor.apana.org.au>2005-05-03 14:43:27 -0700
committerDavid S. Miller <davem@davemloft.net>2005-05-03 14:43:27 -0700
commit96c36023434b7b6824b1da72a6b7b1ca61d7310c (patch)
tree21b46ccc9e88f5ab77e0578356ba7d86e0f5c964 /net
parent9dfa277f88388a94993b121db46b80df66f48d9e (diff)
downloadlinux-96c36023434b7b6824b1da72a6b7b1ca61d7310c.tar.bz2
[NETLINK]: cb_lock does not needs ref count on sk
Here is a little optimisation for the cb_lock used by netlink_dump. While fixing that race earlier, I noticed that the reference count held by cb_lock is completely useless. The reason is that in order to obtain the protection of the reference count, you have to take the cb_lock. But the only way to take the cb_lock is through dereferencing the socket. That is, you must already possess a reference count on the socket before you can take advantage of the reference count held by cb_lock. As a corollary, we can remve the reference count held by the cb_lock. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/netlink/af_netlink.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 29a5fd231eac..4ee392066148 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -373,7 +373,6 @@ static int netlink_release(struct socket *sock)
nlk->cb->done(nlk->cb);
netlink_destroy_callback(nlk->cb);
nlk->cb = NULL;
- __sock_put(sk);
}
spin_unlock(&nlk->cb_lock);
@@ -1099,7 +1098,6 @@ static int netlink_dump(struct sock *sk)
spin_unlock(&nlk->cb_lock);
netlink_destroy_callback(cb);
- __sock_put(sk);
return 0;
}
@@ -1138,7 +1136,6 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
return -EBUSY;
}
nlk->cb = cb;
- sock_hold(sk);
spin_unlock(&nlk->cb_lock);
netlink_dump(sk);