Commit 96c36023 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[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: default avatarHerbert Xu <>
Signed-off-by: default avatarDavid S. Miller <>
parent 9dfa277f
......@@ -373,7 +373,6 @@ static int netlink_release(struct socket *sock)
nlk->cb = NULL;
......@@ -1099,7 +1098,6 @@ static int netlink_dump(struct sock *sk)
return 0;
......@@ -1138,7 +1136,6 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
return -EBUSY;
nlk->cb = cb;
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