Signed-off-by: Javier Cardona <javier@xxxxxxxxxxx>
---
net/mac80211/mesh_pathtbl.c | 64 +++++++++++++++++++++++++------------------
1 files changed, 37 insertions(+), 27 deletions(-)
diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 598249e..ea9e34a 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -49,7 +49,9 @@ int mesh_paths_generation;
/* This lock will have the grow table function as writer and add / delete nodes
* as readers. When reading the table (i.e. doing lookups) we are well protected
- * by RCU
+ * by RCU. We need to take this lock when modying the number of buckets
+ * on one of the path tables but we don't need to if adding or removing mpaths
+ * from hash buckets.
*/
static DEFINE_RWLOCK(pathtbl_resize_lock);
@@ -817,6 +819,32 @@ void mesh_path_flush_by_nexthop(struct sta_info *sta)
rcu_read_unlock();
}
+static void mesh_path_node_reclaim(struct rcu_head *rp)
+{
+ struct mpath_node *node = container_of(rp, struct mpath_node, rcu);
+ struct ieee80211_sub_if_data *sdata = node->mpath->sdata;
+
+ del_timer_sync(&node->mpath->timer);
+ atomic_dec(&sdata->u.mesh.mpaths);
+ kfree(node->mpath);
+ kfree(node);
+}
+
+/* needs to be called with the corresponding hashwlock taken */
+static void __mesh_path_del(struct mesh_table *tbl, struct mpath_node *node)
+{
+ struct mesh_path *mpath;
+ mpath = node->mpath;
+ spin_lock(&mpath->state_lock);
+ mpath->flags |= MESH_PATH_RESOLVING;
+ if (mpath->is_gate)
+ mesh_gate_del(tbl, mpath);
+ hlist_del_rcu(&node->list);
+ call_rcu(&node->rcu, mesh_path_node_reclaim);
+ spin_unlock(&mpath->state_lock);
+ atomic_dec(&tbl->entries);
+}
+
static void mesh_path_flush(struct ieee80211_sub_if_data *sdata)
{
struct mesh_table *tbl;
@@ -829,23 +857,15 @@ static void mesh_path_flush(struct ieee80211_sub_if_data *sdata)
tbl = rcu_dereference(mesh_paths);
for_each_mesh_entry(tbl, p, node, i) {
mpath = node->mpath;
- if (mpath->sdata == sdata)
- mesh_path_del(mpath->dst, mpath->sdata);
+ if (mpath->sdata == sdata) {
+ spin_lock_bh(&tbl->hashwlock[i]);
+ __mesh_path_del(tbl, node);
+ spin_unlock_bh(&tbl->hashwlock[i]);
+ }
}
rcu_read_unlock();
}
-static void mesh_path_node_reclaim(struct rcu_head *rp)
-{
- struct mpath_node *node = container_of(rp, struct mpath_node, rcu);
- struct ieee80211_sub_if_data *sdata = node->mpath->sdata;
-
- del_timer_sync(&node->mpath->timer);
- atomic_dec(&sdata->u.mesh.mpaths);
- kfree(node->mpath);
- kfree(node);
-}
-
static void mpp_path_flush(struct ieee80211_sub_if_data *sdata)
{
struct mesh_table *tbl;
@@ -859,12 +879,8 @@ static void mpp_path_flush(struct ieee80211_sub_if_data *sdata)
lockdep_is_held(pathtbl_resize_lock));
for_each_mesh_entry(tbl, p, node, i) {
mpath = node->mpath;
- if (mpath->sdata != sdata)
- continue;
spin_lock_bh(&tbl->hashwlock[i]);
- hlist_del_rcu(&node->list);
- call_rcu(&node->rcu, mesh_path_node_reclaim);
- atomic_dec(&tbl->entries);
+ __mesh_path_del(tbl, node);
spin_unlock_bh(&tbl->hashwlock[i]);
}
read_unlock_bh(&pathtbl_resize_lock);
@@ -912,14 +928,7 @@ int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata)
mpath = node->mpath;
if (mpath->sdata == sdata &&
memcmp(addr, mpath->dst, ETH_ALEN) == 0) {
- spin_lock_bh(&mpath->state_lock);
- if (mpath->is_gate)
- mesh_gate_del(tbl, mpath);
- mpath->flags |= MESH_PATH_RESOLVING;
- hlist_del_rcu(&node->list);
- call_rcu(&node->rcu, mesh_path_node_reclaim);
- atomic_dec(&tbl->entries);
- spin_unlock_bh(&mpath->state_lock);
+ __mesh_path_del(tbl, node);
goto enddel;
}
}
@@ -1160,6 +1169,7 @@ void mesh_path_expire(struct ieee80211_sub_if_data *sdata)
(!(mpath->flags & MESH_PATH_FIXED)) &&
time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE))
mesh_path_del(mpath->dst, mpath->sdata);
+ }
rcu_read_unlock();
}
--
1.7.6
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