mac80211: mesh: embed gates hlist head directly

Since we have converted the mesh path tables to rhashtable, we are
no longer swapping out the entire mesh_pathtbl pointer with RCU.
As a result, we no longer need indirection to the hlist head for
the gates list and can simply embed it, saving a pair of
pointer-sized allocations.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 5 insertions, 15 deletions

diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
index bc3f9a32b5a4..46b540a25d9d 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -134,7 +134,7 @@ struct mesh_path {
  */
 struct mesh_table {
         atomic_t entries;               /* Up to MAX_MESH_NEIGHBOURS */
-        struct hlist_head *known_gates;
+        struct hlist_head known_gates;
         spinlock_t gates_lock;
 
         struct rhashtable rhead;
diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 1c9412a29ca3..6db2ddfa0695 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -58,12 +58,7 @@ static struct mesh_table *mesh_table_alloc(void)
         if (!newtbl)
                 return NULL;
 
-        newtbl->known_gates = kzalloc(sizeof(struct hlist_head), GFP_ATOMIC);
-        if (!newtbl->known_gates) {
-                kfree(newtbl);
-                return NULL;
-        }
-        INIT_HLIST_HEAD(newtbl->known_gates);
+        INIT_HLIST_HEAD(&newtbl->known_gates);
         atomic_set(&newtbl->entries,  0);
         spin_lock_init(&newtbl->gates_lock);
 
@@ -341,7 +336,7 @@ int mesh_path_add_gate(struct mesh_path *mpath)
         mpath->sdata->u.mesh.num_gates++;
 
         spin_lock(&tbl->gates_lock);
-        hlist_add_head_rcu(&mpath->gate_list, tbl->known_gates);
+        hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates);
         spin_unlock(&tbl->gates_lock);
 
         spin_unlock_bh(&mpath->state_lock);
@@ -759,16 +754,11 @@ int mesh_path_send_to_gates(struct mesh_path *mpath)
         struct mesh_path *from_mpath = mpath;
         struct mesh_path *gate;
         bool copy = false;
-        struct hlist_head *known_gates;
 
         tbl = sdata->u.mesh.mesh_paths;
-        known_gates = tbl->known_gates;
-
-        if (!known_gates)
-                return -EHOSTUNREACH;
 
         rcu_read_lock();
-        hlist_for_each_entry_rcu(gate, known_gates, gate_list) {
+        hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
                 if (gate->flags & MESH_PATH_ACTIVE) {
                         mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst);
                         mesh_path_move_to_queue(gate, from_mpath, copy);
@@ -781,7 +771,7 @@ int mesh_path_send_to_gates(struct mesh_path *mpath)
                 }
         }
 
-        hlist_for_each_entry_rcu(gate, known_gates, gate_list) {
+        hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
                 mpath_dbg(sdata, "Sending to %pM\n", gate->dst);
                 mesh_path_tx_pending(gate);
         }