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 <ktk...@virtuozzo.com>
Acked-by: Andrei Vagin <ava...@virtuozzo.com>
 lib/kobject_uevent.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 9fe6ec8fda28..9539d7ab3ea8 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -650,6 +650,7 @@ 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)

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