package/kernel/mac80211/patches/329-mac80211-Unify-mesh-and-mpp-path-removal-function.patch

   1 From: Henning Rogge <hrogge@gmail.com>
   2 Date: Wed, 3 Feb 2016 13:58:38 +0100
   3 Subject: [PATCH] mac80211: Unify mesh and mpp path removal function
   4
   5 mpp_path_del() and mesh_path_del() are mostly the same function.
   6 Move common code into a new static function.
   7
   8 Acked-by: Bob Copeland <me@bobcopeland.com>
   9 Signed-off-by: Henning Rogge <henning.rogge@fkie.fraunhofer.de>
  10 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  11 ---
  12
  13 --- a/net/mac80211/mesh_pathtbl.c
  14 +++ b/net/mac80211/mesh_pathtbl.c
  15 @@ -55,16 +55,21 @@ int mpp_paths_generation;
  16  static DEFINE_RWLOCK(pathtbl_resize_lock);
  17
  18
  19 +static inline struct mesh_table *resize_dereference_paths(
  20 +       struct mesh_table __rcu *table)
  21 +{
  22 +       return rcu_dereference_protected(table,
  23 +                                       lockdep_is_held(&pathtbl_resize_lock));
  24 +}
  25 +
  26  static inline struct mesh_table *resize_dereference_mesh_paths(void)
  27  {
  28 -       return rcu_dereference_protected(mesh_paths,
  29 -               lockdep_is_held(&pathtbl_resize_lock));
  30 +       return resize_dereference_paths(mesh_paths);
  31  }
  32
  33  static inline struct mesh_table *resize_dereference_mpp_paths(void)
  34  {
  35 -       return rcu_dereference_protected(mpp_paths,
  36 -               lockdep_is_held(&pathtbl_resize_lock));
  37 +       return resize_dereference_paths(mpp_paths);
  38  }
  39
  40  /*
  41 @@ -899,14 +904,17 @@ void mesh_path_flush_by_iface(struct iee
  42  }
  43
  44  /**
  45 - * mesh_path_del - delete a mesh path from the table
  46 + * table_path_del - delete a path from the mesh or mpp table
  47   *
  48 - * @addr: dst address (ETH_ALEN length)
  49 + * @tbl: mesh or mpp path table
  50   * @sdata: local subif
  51 + * @addr: dst address (ETH_ALEN length)
  52   *
  53   * Returns: 0 if successful
  54   */
  55 -int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
  56 +static int table_path_del(struct mesh_table __rcu *rcu_tbl,
  57 +                         struct ieee80211_sub_if_data *sdata,
  58 +                         const u8 *addr)
  59  {
  60         struct mesh_table *tbl;
  61         struct mesh_path *mpath;
  62 @@ -915,11 +923,7 @@ int mesh_path_del(struct ieee80211_sub_i
  63         int hash_idx;
  64         int err = 0;
  65
  66 -       /* flush relevant mpp entries first */
  67 -       mpp_flush_by_proxy(sdata, addr);
  68 -
  69 -       read_lock_bh(&pathtbl_resize_lock);
  70 -       tbl = resize_dereference_mesh_paths();
  71 +       tbl = resize_dereference_paths(rcu_tbl);
  72         hash_idx = mesh_table_hash(addr, sdata, tbl);
  73         bucket = &tbl->hash_buckets[hash_idx];
  74
  75 @@ -935,9 +939,30 @@ int mesh_path_del(struct ieee80211_sub_i
  76
  77         err = -ENXIO;
  78  enddel:
  79 -       mesh_paths_generation++;
  80         spin_unlock(&tbl->hashwlock[hash_idx]);
  81 +       return err;
  82 +}
  83 +
  84 +/**
  85 + * mesh_path_del - delete a mesh path from the table
  86 + *
  87 + * @addr: dst address (ETH_ALEN length)
  88 + * @sdata: local subif
  89 + *
  90 + * Returns: 0 if successful
  91 + */
  92 +int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
  93 +{
  94 +       int err = 0;
  95 +
  96 +       /* flush relevant mpp entries first */
  97 +       mpp_flush_by_proxy(sdata, addr);
  98 +
  99 +       read_lock_bh(&pathtbl_resize_lock);
 100 +       err = table_path_del(mesh_paths, sdata, addr);
 101 +       mesh_paths_generation++;
 102         read_unlock_bh(&pathtbl_resize_lock);
 103 +
 104         return err;
 105  }
 106
 107 @@ -951,33 +976,13 @@ enddel:
 108   */
 109  static int mpp_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
 110  {
 111 -       struct mesh_table *tbl;
 112 -       struct mesh_path *mpath;
 113 -       struct mpath_node *node;
 114 -       struct hlist_head *bucket;
 115 -       int hash_idx;
 116         int err = 0;
 117
 118         read_lock_bh(&pathtbl_resize_lock);
 119 -       tbl = resize_dereference_mpp_paths();
 120 -       hash_idx = mesh_table_hash(addr, sdata, tbl);
 121 -       bucket = &tbl->hash_buckets[hash_idx];
 122 -
 123 -       spin_lock(&tbl->hashwlock[hash_idx]);
 124 -       hlist_for_each_entry(node, bucket, list) {
 125 -               mpath = node->mpath;
 126 -               if (mpath->sdata == sdata &&
 127 -                   ether_addr_equal(addr, mpath->dst)) {
 128 -                       __mesh_path_del(tbl, node);
 129 -                       goto enddel;
 130 -               }
 131 -       }
 132 -
 133 -       err = -ENXIO;
 134 -enddel:
 135 -       mesh_paths_generation++;
 136 -       spin_unlock(&tbl->hashwlock[hash_idx]);
 137 +       err = table_path_del(mpp_paths, sdata, addr);
 138 +       mpp_paths_generation++;
 139         read_unlock_bh(&pathtbl_resize_lock);
 140 +
 141         return err;
 142  }
 143