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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>
This commit is contained in:
Thomas Pedersen 2012-03-06 16:42:09 -08:00 committed by John W. Linville
parent b443d8d8a2
commit f06c7885c3
1 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
net/mac80211/mesh_pathtbl.c
View File

@ -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;
}