From: Thomas Pedersen Date: Wed, 7 Mar 2012 00:42:09 +0000 (-0800) Subject: mac80211: fix smatch lock errors in mesh X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f06c7885c3dd3db8eb771e10615ee41425607e95;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git mac80211: fix smatch lock errors in mesh smatch was complaining: CHECK net/mac80211/mesh_pathtbl.c net/mac80211/mesh_pathtbl.c:562 mesh_path_add() error: double lock 'bottom_half:' net/mac80211/mesh_pathtbl.c:580 mesh_path_add() error: double unlock 'bottom_half:' net/mac80211/mesh_pathtbl.c:589 mesh_path_add() error: double unlock 'bottom_half:' net/mac80211/mesh_pathtbl.c:691 mpp_path_add() error: double lock 'bottom_half:' net/mac80211/mesh_pathtbl.c:707 mpp_path_add() error: double unlock 'bottom_half:' net/mac80211/mesh_pathtbl.c:716 mpp_path_add() error: double unlock 'bottom_half:' net/mac80211/mesh_pathtbl.c:814 mesh_path_flush_by_nexthop() error: double lock 'bottom_half:' net/mac80211/mesh_pathtbl.c:819 mesh_path_flush_by_nexthop() error: double unlock 'bottom_half:' net/mac80211/mesh_pathtbl.c:887 mesh_path_del() error: double lock 'bottom_half:' net/mac80211/mesh_pathtbl.c:901 mesh_path_del() error: double unlock 'bottom_half:' So don't lock / unlock with _bh() while bottom halves are already disabled. Reported-by: Johannes Berg Signed-off-by: Thomas Pedersen Signed-off-by: John W. Linville --- diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c index 157642f780b9..be1361b5f7ad 100644 --- a/net/mac80211/mesh_pathtbl.c +++ b/net/mac80211/mesh_pathtbl.c @@ -559,7 +559,7 @@ int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata) hash_idx = mesh_table_hash(dst, sdata, tbl); bucket = &tbl->hash_buckets[hash_idx]; - spin_lock_bh(&tbl->hashwlock[hash_idx]); + spin_lock(&tbl->hashwlock[hash_idx]); err = -EEXIST; hlist_for_each_entry(node, n, bucket, list) { @@ -576,7 +576,7 @@ int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata) mesh_paths_generation++; - spin_unlock_bh(&tbl->hashwlock[hash_idx]); + spin_unlock(&tbl->hashwlock[hash_idx]); read_unlock_bh(&pathtbl_resize_lock); if (grow) { set_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags); @@ -585,7 +585,7 @@ int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata) return 0; err_exists: - spin_unlock_bh(&tbl->hashwlock[hash_idx]); + spin_unlock(&tbl->hashwlock[hash_idx]); read_unlock_bh(&pathtbl_resize_lock); kfree(new_node); err_node_alloc: @@ -688,7 +688,7 @@ int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata) hash_idx = mesh_table_hash(dst, sdata, tbl); bucket = &tbl->hash_buckets[hash_idx]; - spin_lock_bh(&tbl->hashwlock[hash_idx]); + spin_lock(&tbl->hashwlock[hash_idx]); err = -EEXIST; hlist_for_each_entry(node, n, bucket, list) { @@ -703,7 +703,7 @@ int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata) tbl->mean_chain_len * (tbl->hash_mask + 1)) grow = 1; - spin_unlock_bh(&tbl->hashwlock[hash_idx]); + spin_unlock(&tbl->hashwlock[hash_idx]); read_unlock_bh(&pathtbl_resize_lock); if (grow) { set_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags); @@ -712,7 +712,7 @@ int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata) return 0; err_exists: - spin_unlock_bh(&tbl->hashwlock[hash_idx]); + spin_unlock(&tbl->hashwlock[hash_idx]); read_unlock_bh(&pathtbl_resize_lock); kfree(new_node); err_node_alloc: @@ -811,9 +811,9 @@ void mesh_path_flush_by_nexthop(struct sta_info *sta) for_each_mesh_entry(tbl, p, node, i) { mpath = node->mpath; if (rcu_dereference(mpath->next_hop) == sta) { - spin_lock_bh(&tbl->hashwlock[i]); + spin_lock(&tbl->hashwlock[i]); __mesh_path_del(tbl, node); - spin_unlock_bh(&tbl->hashwlock[i]); + spin_unlock(&tbl->hashwlock[i]); } } read_unlock_bh(&pathtbl_resize_lock); @@ -884,7 +884,7 @@ int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata) hash_idx = mesh_table_hash(addr, sdata, tbl); bucket = &tbl->hash_buckets[hash_idx]; - spin_lock_bh(&tbl->hashwlock[hash_idx]); + spin_lock(&tbl->hashwlock[hash_idx]); hlist_for_each_entry(node, n, bucket, list) { mpath = node->mpath; if (mpath->sdata == sdata && @@ -897,7 +897,7 @@ int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata) err = -ENXIO; enddel: mesh_paths_generation++; - spin_unlock_bh(&tbl->hashwlock[hash_idx]); + spin_unlock(&tbl->hashwlock[hash_idx]); read_unlock_bh(&pathtbl_resize_lock); return err; }