diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/mesh_pathtbl.c | 65 |
1 files changed, 26 insertions, 39 deletions
diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c index 4a3053b09e31..7797f55eec46 100644 --- a/net/mac80211/mesh_pathtbl.c +++ b/net/mac80211/mesh_pathtbl.c @@ -790,35 +790,6 @@ void mesh_plink_broken(struct sta_info *sta) rcu_read_unlock(); } -/** - * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches - * - * @sta - mesh peer to match - * - * RCU notes: this function is called when a mesh plink transitions from - * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that - * allows path creation. This will happen before the sta can be freed (because - * sta_info_destroy() calls this) so any reader in a rcu read block will be - * protected against the plink disappearing. - */ -void mesh_path_flush_by_nexthop(struct sta_info *sta) -{ - struct mesh_table *tbl; - struct mesh_path *mpath; - struct mpath_node *node; - struct hlist_node *p; - int i; - - rcu_read_lock(); - tbl = rcu_dereference(mesh_paths); - for_each_mesh_entry(tbl, p, node, i) { - mpath = node->mpath; - if (rcu_dereference(mpath->next_hop) == sta) - mesh_path_del(mpath->dst, mpath->sdata); - } - rcu_read_unlock(); -} - static void mesh_path_node_reclaim(struct rcu_head *rp) { struct mpath_node *node = container_of(rp, struct mpath_node, rcu); @@ -845,7 +816,18 @@ static void __mesh_path_del(struct mesh_table *tbl, struct mpath_node *node) atomic_dec(&tbl->entries); } -static void mesh_path_flush(struct ieee80211_sub_if_data *sdata) +/** + * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches + * + * @sta - mesh peer to match + * + * RCU notes: this function is called when a mesh plink transitions from + * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that + * allows path creation. This will happen before the sta can be freed (because + * sta_info_destroy() calls this) so any reader in a rcu read block will be + * protected against the plink disappearing. + */ +void mesh_path_flush_by_nexthop(struct sta_info *sta) { struct mesh_table *tbl; struct mesh_path *mpath; @@ -857,7 +839,7 @@ 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) { + if (rcu_dereference(mpath->next_hop) == sta) { spin_lock_bh(&tbl->hashwlock[i]); __mesh_path_del(tbl, node); spin_unlock_bh(&tbl->hashwlock[i]); @@ -866,24 +848,23 @@ static void mesh_path_flush(struct ieee80211_sub_if_data *sdata) rcu_read_unlock(); } -static void mpp_path_flush(struct ieee80211_sub_if_data *sdata) +static void table_flush_by_iface(struct mesh_table *tbl, + struct ieee80211_sub_if_data *sdata) { - struct mesh_table *tbl; struct mesh_path *mpath; struct mpath_node *node; struct hlist_node *p; int i; - read_lock_bh(&pathtbl_resize_lock); - tbl = rcu_dereference_protected(mpp_paths, - lockdep_is_held(pathtbl_resize_lock)); + WARN_ON(!rcu_read_lock_held()); for_each_mesh_entry(tbl, p, node, i) { mpath = node->mpath; + if (mpath->sdata != sdata) + continue; spin_lock_bh(&tbl->hashwlock[i]); __mesh_path_del(tbl, node); spin_unlock_bh(&tbl->hashwlock[i]); } - read_unlock_bh(&pathtbl_resize_lock); } /** @@ -896,8 +877,14 @@ static void mpp_path_flush(struct ieee80211_sub_if_data *sdata) */ void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) { - mesh_path_flush(sdata); - mpp_path_flush(sdata); + struct mesh_table *tbl; + + rcu_read_lock(); + tbl = rcu_dereference(mesh_paths); + table_flush_by_iface(tbl, sdata); + tbl = rcu_dereference(mpp_paths); + table_flush_by_iface(tbl, sdata); + rcu_read_unlock(); } /** |