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 <johannes@sipsolutions.net>
Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 157642f..be1361b 100644 (file)
--- 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;
 }