neigh: __rcu annotations

fix some minor issues and sparse (__rcu) warnings

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 6 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 60a902913429..799f06e03a22 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -316,7 +316,7 @@ static struct neigh_hash_table *neigh_hash_alloc(unsigned int entries)
 {
         size_t size = entries * sizeof(struct neighbour *);
         struct neigh_hash_table *ret;
-        struct neighbour **buckets;
+        struct neighbour __rcu **buckets;
 
         ret = kmalloc(sizeof(*ret), GFP_ATOMIC);
         if (!ret)
@@ -324,14 +324,14 @@ static struct neigh_hash_table *neigh_hash_alloc(unsigned int entries)
         if (size <= PAGE_SIZE)
                 buckets = kzalloc(size, GFP_ATOMIC);
         else
-                buckets = (struct neighbour **)
+                buckets = (struct neighbour __rcu **)
                           __get_free_pages(GFP_ATOMIC | __GFP_ZERO,
                                            get_order(size));
         if (!buckets) {
                 kfree(ret);
                 return NULL;
         }
-        rcu_assign_pointer(ret->hash_buckets, buckets);
+        ret->hash_buckets = buckets;
         ret->hash_mask = entries - 1;
         get_random_bytes(&ret->hash_rnd, sizeof(ret->hash_rnd));
         return ret;
@@ -343,7 +343,7 @@ static void neigh_hash_free_rcu(struct rcu_head *head)
                                                     struct neigh_hash_table,
                                                     rcu);
         size_t size = (nht->hash_mask + 1) * sizeof(struct neighbour *);
-        struct neighbour **buckets = nht->hash_buckets;
+        struct neighbour __rcu **buckets = nht->hash_buckets;
 
         if (size <= PAGE_SIZE)
                 kfree(buckets);
@@ -1540,7 +1540,7 @@ void neigh_table_init_no_netlink(struct neigh_table *tbl)
                 panic("cannot create neighbour proc dir entry");
 #endif
 
-        tbl->nht = neigh_hash_alloc(8);
+        RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(8));
 
         phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *);
         tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL);
@@ -1602,7 +1602,8 @@ int neigh_table_clear(struct neigh_table *tbl)
         }
         write_unlock(&neigh_tbl_lock);
 
-        call_rcu(&tbl->nht->rcu, neigh_hash_free_rcu);
+        call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu,
+                 neigh_hash_free_rcu);
         tbl->nht = NULL;
 
         kfree(tbl->phash_buckets);