[Patch net-next] netlink: use blocking notifier
From: Cong Wang <hidden>
Date: 2016-12-10 05:11:12
netlink_chain is called in ->release(), which is apparently a process context, so we don't have to use an atomic notifier here. Signed-off-by: Cong Wang <redacted> --- net/netlink/af_netlink.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 246f29d..801d474 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c@@ -113,7 +113,7 @@ static atomic_t nl_table_users = ATOMIC_INIT(0); #define nl_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&nl_table_lock)); -static ATOMIC_NOTIFIER_HEAD(netlink_chain); +static BLOCKING_NOTIFIER_HEAD(netlink_chain); static DEFINE_SPINLOCK(netlink_tap_lock); static struct list_head netlink_tap_all __read_mostly;
@@ -711,7 +711,7 @@ static int netlink_release(struct socket *sock) .protocol = sk->sk_protocol, .portid = nlk->portid, }; - atomic_notifier_call_chain(&netlink_chain, + blocking_notifier_call_chain(&netlink_chain, NETLINK_URELEASE, &n); }
@@ -2504,13 +2504,13 @@ static const struct file_operations netlink_seq_fops = { int netlink_register_notifier(struct notifier_block *nb) { - return atomic_notifier_chain_register(&netlink_chain, nb); + return blocking_notifier_chain_register(&netlink_chain, nb); } EXPORT_SYMBOL(netlink_register_notifier); int netlink_unregister_notifier(struct notifier_block *nb) { - return atomic_notifier_chain_unregister(&netlink_chain, nb); + return blocking_notifier_chain_unregister(&netlink_chain, nb); } EXPORT_SYMBOL(netlink_unregister_notifier);
--
2.5.5