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authorJohannes Berg <johannes.berg@intel.com>2014-12-22 18:56:37 +0100
committerDavid S. Miller <davem@davemloft.net>2014-12-27 02:20:23 -0500
commitb10dcb3b94010e3ac3951f68789400b1665effb1 (patch)
tree5ec269ffbedc0117a3246ad32691b78e03402abd
parentf8403a2e47afb37bcd3b7e286996d138a116c39d (diff)
netlink: update listeners directly when removing socket
The code is now confusing to read - first in one function down (netlink_remove) any group subscriptions are implicitly removed by calling __sk_del_bind_node(), but the subscriber database is only updated far later by calling netlink_update_listeners(). Move the latter call to just after removal from the list so it is easier to follow the code. This also enables moving the locking inside the kernel-socket conditional, which improves the normal socket destruction path. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/netlink/af_netlink.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index b4cf8ee0e1b8..6a9fb7c489a8 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1091,8 +1091,10 @@ static void netlink_remove(struct sock *sk)
mutex_unlock(&nl_sk_hash_lock);
netlink_table_grab();
- if (nlk_sk(sk)->subscriptions)
+ if (nlk_sk(sk)->subscriptions) {
__sk_del_bind_node(sk);
+ netlink_update_listeners(sk);
+ }
netlink_table_ungrab();
}
@@ -1226,8 +1228,8 @@ static int netlink_release(struct socket *sock)
module_put(nlk->module);
- netlink_table_grab();
if (netlink_is_kernel(sk)) {
+ netlink_table_grab();
BUG_ON(nl_table[sk->sk_protocol].registered == 0);
if (--nl_table[sk->sk_protocol].registered == 0) {
struct listeners *old;
@@ -1241,10 +1243,8 @@ static int netlink_release(struct socket *sock)
nl_table[sk->sk_protocol].flags = 0;
nl_table[sk->sk_protocol].registered = 0;
}
- } else if (nlk->subscriptions) {
- netlink_update_listeners(sk);
+ netlink_table_ungrab();
}
- netlink_table_ungrab();
kfree(nlk->groups);
nlk->groups = NULL;