net: bridge: fdb: avoid two atomic bitops in br_fdb_external_learn_add()

If we setup the fdb flags prior to calling fdb_create() we can avoid
two atomic bitops when learning a new entry.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index b37e0f4..7500c84 100644 (file)
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -1113,14 +1113,15 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 
        fdb = br_fdb_find(br, addr, vid);
        if (!fdb) {
-               fdb = fdb_create(br, p, addr, vid, 0);
+               unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
+
+               if (swdev_notify)
+                       flags |= BIT(BR_FDB_ADDED_BY_USER);
+               fdb = fdb_create(br, p, addr, vid, flags);
                if (!fdb) {
                        err = -ENOMEM;
                        goto err_unlock;
                }
-               if (swdev_notify)
-                       set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
-               set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
                fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
        } else {
                fdb->updated = jiffies;