[PATCH -next 3/6] netfilter: Simply the tests for enabling and disabling the ingress queue hook

[Eric W. Biederman]

Replace an overcomplicated switch statement with a simple if statement.

This also removes the ingress queue enable outside of nf_hook_mutex as
the protection provided by the mutex is not necessary and the code is
clearer having both of the static key increments together.

Signed-off-by: "Eric W. Biederman" <ebied...@xmission.com>
---
 net/netfilter/core.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index a0e54974e2c9..7e3bc12f1c62 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -74,7 +74,6 @@ int nf_register_hook(struct nf_hook_ops *reg)
                if (reg->hooknum == NF_NETDEV_INGRESS) {
                        BUG_ON(reg->dev == NULL);
                        nf_hook_list = &reg->dev->nf_hooks_ingress;
-                       net_inc_ingress_queue();
                        break;
                }
 #endif
@@ -90,6 +89,10 @@ int nf_register_hook(struct nf_hook_ops *reg)
        }
        list_add_rcu(&reg->list, elem->list.prev);
        mutex_unlock(&nf_hook_mutex);
+#ifdef CONFIG_NETFILTER_INGRESS
+       if ((reg->pf == NFPROTO_NETDEV) && (reg->hooknum == NF_NETDEV_INGRESS))
+               net_inc_ingress_queue();
+#endif
 #ifdef HAVE_JUMP_LABEL
        static_key_slow_inc(&nf_hooks_needed[reg->pf][reg->hooknum]);
 #endif
@@ -102,18 +105,10 @@ void nf_unregister_hook(struct nf_hook_ops *reg)
        mutex_lock(&nf_hook_mutex);
        list_del_rcu(&reg->list);
        mutex_unlock(&nf_hook_mutex);
-       switch (reg->pf) {
-       case NFPROTO_NETDEV:
 #ifdef CONFIG_NETFILTER_INGRESS
-               if (reg->hooknum == NF_NETDEV_INGRESS) {
-                       net_dec_ingress_queue();
-                       break;
-               }
-               break;
+       if ((reg->pf == NFPROTO_NETDEV) && (reg->hooknum == NF_NETDEV_INGRESS))
+               net_dec_ingress_queue();
 #endif
-       default:
-               break;
-       }
 #ifdef HAVE_JUMP_LABEL
        static_key_slow_dec(&nf_hooks_needed[reg->pf][reg->hooknum]);
 #endif
-- 
2.2.1

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