[PATCH v2 16/31] net: Convert uevent_net_ops

From: Kirill Tkhai
Date: Mon Nov 20 2017 - 13:40:46 EST

uevent_net_init() and uevent_net_exit() create and
destroy netlink socket, and these actions serialized
in netlink code.

Parallel execution with other pernet_operations
makes the socket disappear earlier from uevent_sock_list
on ->exit. As userspace can't be interested in broadcast
messages of dying net, and, as I see, no one in kernel
listen them, we may safely make uevent_net_ops async.

Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
lib/kobject_uevent.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index c3e84edc47c9..4a2c39ae1e65 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -643,6 +643,7 @@ static void uevent_net_exit(struct net *net)
static struct pernet_operations uevent_net_ops = {
.init = uevent_net_init,
.exit = uevent_net_exit,
+ .async = true,

static int __init kobject_uevent_init(void)