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netlink: use blocking notifier 

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 <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2016-12-09 21:10:59 -08:00 committed by David S. Miller
parent 821781a9f4
commit efa172f428
1 changed files with 4 additions and 4 deletions
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8
net/netlink/af_netlink.c
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@ -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);