These pernet_operations create and destroy net::ipv6.icmp_sk
socket, used to send ICMP or error reply.
Nobody can dereference the socket to handle a packet before
net is initialized, as there is no routing; nobody can do
that in parallel with exit, as all of devices are moved
to init_net or destroyed and there are no packets it-flight.
So, it's possible to mark these pernet_operations as async.
The same for ndisc_net_ops and for igmp6_net_ops. The last
one also creates and destroys /proc entries.
Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
net/ipv6/icmp.c | 1 +
net/ipv6/mcast.c | 1 +
net/ipv6/ndisc.c | 1 +
3 files changed, 3 insertions(+)
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 6ae5dd3f4d0d..4fa4f1b150a4 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -997,6 +997,7 @@ static void __net_exit icmpv6_sk_exit(struct net *net)
static struct pernet_operations icmpv6_sk_ops = {
.init = icmpv6_sk_init,
.exit = icmpv6_sk_exit,
+ .async = true,
};
int __init icmpv6_init(void)
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 9b9d2ff01b35..d9bb933dd5c4 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -2997,6 +2997,7 @@ static void __net_exit igmp6_net_exit(struct net *net)
static struct pernet_operations igmp6_net_ops = {
.init = igmp6_net_init,
.exit = igmp6_net_exit,
+ .async = true,
};
int __init igmp6_init(void)
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index f61a5b613b52..0a19ce3a6f7f 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1882,6 +1882,7 @@ static void __net_exit ndisc_net_exit(struct net *net)
static struct pernet_operations ndisc_net_ops = {
.init = ndisc_net_init,
.exit = ndisc_net_exit,
+ .async = true,
};
int __init ndisc_init(void)
