netfilter: nf_conntrack_proto_gre: switch to register_pernet_gen_subsys()

register_pernet_gen_device() can't be used is nf_conntrack_pptp module is
also used (compiled in or loaded).

Right now, proto_gre_net_exit() is called before nf_conntrack_pptp_net_exit().
The former shutdowns and frees GRE piece of netns, however the latter
absolutely needs it to flush keymap. Oops is inevitable.

Switch to shiny new register_pernet_gen_subsys() to get correct ordering in
netns ops list.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c
index a2cdbcb..4ab62ad 100644 (file)
--- a/net/netfilter/nf_conntrack_proto_gre.c
+++ b/net/netfilter/nf_conntrack_proto_gre.c
@@ -335,7 +335,7 @@ static int __init nf_ct_proto_gre_init(void)
        rv = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_gre4);
        if (rv < 0)
                return rv;
-       rv = register_pernet_gen_device(&proto_gre_net_id, &proto_gre_net_ops);
+       rv = register_pernet_gen_subsys(&proto_gre_net_id, &proto_gre_net_ops);
        if (rv < 0)
                nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_gre4);
        return rv;
@@ -344,7 +344,7 @@ static int __init nf_ct_proto_gre_init(void)
 static void nf_ct_proto_gre_fini(void)
 {
        nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_gre4);
-       unregister_pernet_gen_device(proto_gre_net_id, &proto_gre_net_ops);
+       unregister_pernet_gen_subsys(proto_gre_net_id, &proto_gre_net_ops);
 }
 
 module_init(nf_ct_proto_gre_init);