mac80211: mesh: don't hash sdata in mpath tables

Now that the sdata pointer is the same for all entries of a
path table, hashing it is pointless, so hash only the address.

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

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 0508b37..fc3cc35 100644 (file)
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -177,12 +177,10 @@ errcopy:
        return -ENOMEM;
 }
 
-static u32 mesh_table_hash(const u8 *addr, struct ieee80211_sub_if_data *sdata,
-                          struct mesh_table *tbl)
+static u32 mesh_table_hash(const u8 *addr, struct mesh_table *tbl)
 {
-       /* Use last four bytes of hw addr and interface index as hash index */
-       return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex,
-                           tbl->hash_rnd) & tbl->hash_mask;
+       /* Use last four bytes of hw addr as hash index */
+       return jhash_1word(*(u32 *)(addr+2), tbl->hash_rnd) & tbl->hash_mask;
 }
 
 
@@ -331,7 +329,7 @@ static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst,
        struct hlist_head *bucket;
        struct mpath_node *node;
 
-       bucket = &tbl->hash_buckets[mesh_table_hash(dst, sdata, tbl)];
+       bucket = &tbl->hash_buckets[mesh_table_hash(dst, tbl)];
        hlist_for_each_entry_rcu(node, bucket, list) {
                mpath = node->mpath;
                if (ether_addr_equal(dst, mpath->dst)) {
@@ -538,7 +536,7 @@ struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata,
        read_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);
        tbl = resize_dereference_mesh_paths(sdata);
 
-       hash_idx = mesh_table_hash(dst, sdata, tbl);
+       hash_idx = mesh_table_hash(dst, tbl);
        bucket = &tbl->hash_buckets[hash_idx];
 
        spin_lock(&tbl->hashwlock[hash_idx]);
@@ -687,7 +685,7 @@ int mpp_path_add(struct ieee80211_sub_if_data *sdata,
 
        tbl = resize_dereference_mpp_paths(sdata);
 
-       hash_idx = mesh_table_hash(dst, sdata, tbl);
+       hash_idx = mesh_table_hash(dst, tbl);
        bucket = &tbl->hash_buckets[hash_idx];
 
        spin_lock(&tbl->hashwlock[hash_idx]);
@@ -905,7 +903,7 @@ static int table_path_del(struct mesh_table __rcu *rcu_tbl,
        int err = 0;
 
        tbl = resize_dereference_paths(sdata, rcu_tbl);
-       hash_idx = mesh_table_hash(addr, sdata, tbl);
+       hash_idx = mesh_table_hash(addr, tbl);
        bucket = &tbl->hash_buckets[hash_idx];
 
        spin_lock(&tbl->hashwlock[hash_idx]);
@@ -1107,7 +1105,7 @@ static int mesh_path_node_copy(struct hlist_node *p, struct mesh_table *newtbl)
        node = hlist_entry(p, struct mpath_node, list);
        mpath = node->mpath;
        new_node->mpath = mpath;
-       hash_idx = mesh_table_hash(mpath->dst, mpath->sdata, newtbl);
+       hash_idx = mesh_table_hash(mpath->dst, newtbl);
        hlist_add_head(&new_node->list,
                        &newtbl->hash_buckets[hash_idx]);
        return 0;