inetpeer: Don't disable BH for initial fast RCU lookup.

If modifications on other cpus are ok, then modifications to
the tree during lookup done by the local cpu are ok too.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index f604ffd..6442c35 100644 (file)
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -206,16 +206,16 @@ static int addr_compare(const struct inetpeer_addr *a,
 })
 
 /*
- * Called with rcu_read_lock_bh()
+ * Called with rcu_read_lock()
  * Because we hold no lock against a writer, its quite possible we fall
  * in an endless loop.
  * But every pointer we follow is guaranteed to be valid thanks to RCU.
  * We exit from this function if number of links exceeds PEER_MAXDEPTH
  */
-static struct inet_peer *lookup_rcu_bh(const struct inetpeer_addr *daddr,
-                                      struct inet_peer_base *base)
+static struct inet_peer *lookup_rcu(const struct inetpeer_addr *daddr,
+                                   struct inet_peer_base *base)
 {
-       struct inet_peer *u = rcu_dereference_bh(base->root);
+       struct inet_peer *u = rcu_dereference(base->root);
        int count = 0;
 
        while (u != peer_avl_empty) {
@@ -231,9 +231,9 @@ static struct inet_peer *lookup_rcu_bh(const struct inetpeer_addr *daddr,
                        return u;
                }
                if (cmp == -1)
-                       u = rcu_dereference_bh(u->avl_left);
+                       u = rcu_dereference(u->avl_left);
                else
-                       u = rcu_dereference_bh(u->avl_right);
+                       u = rcu_dereference(u->avl_right);
                if (unlikely(++count == PEER_MAXDEPTH))
                        break;
        }
@@ -470,11 +470,11 @@ struct inet_peer *inet_getpeer(struct inetpeer_addr *daddr, int create)
        /* Look up for the address quickly, lockless.
         * Because of a concurrent writer, we might not find an existing entry.
         */
-       rcu_read_lock_bh();
+       rcu_read_lock();
        sequence = read_seqbegin(&base->lock);
-       p = lookup_rcu_bh(daddr, base);
+       p = lookup_rcu(daddr, base);
        invalidated = read_seqretry(&base->lock, sequence);
-       rcu_read_unlock_bh();
+       rcu_read_unlock();
 
        if (p) {
                /* The existing node has been found.