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| author | Johannes Berg <johannes.berg@intel.com> | 2011-11-21 11:23:50 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-11-21 16:22:10 -0500 |
| commit | 30be52e44fd4276d768efffb55d424fb682e6505 (patch) | |
| tree | 15ccf1db03149f280c23056922b33c520d101279 /net | |
| parent | 11a2a357a9d8e058db032883ffd535bf4ad6a899 (diff) | |
| download | linux-3.10-30be52e44fd4276d768efffb55d424fb682e6505.tar.gz linux-3.10-30be52e44fd4276d768efffb55d424fb682e6505.tar.bz2 linux-3.10-30be52e44fd4276d768efffb55d424fb682e6505.zip | |
mac80211: fix RCU warnings in mesh
Sparse RCU checking reports two warnings in the mesh
path table code. These are due to questionable uses of
rcu_dereference.
To fix the first one, get rid of mesh_gate_add() and
just make mesh_path_add_gate() do the correct deref.
To fix the second one, simply remove rcu_dereference()
in mesh_gate_del() -- it already gets a proper pointer
as indicated by the prototype (no __rcu annotation)
and confirmed by the code.
Cc: Javier Cardona <javier@cozybit.com>
Cc: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/mesh_pathtbl.c | 27 |
1 files changed, 5 insertions, 22 deletions
diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c index 4fc23d1b9c3..7bd2a76aef0 100644 --- a/net/mac80211/mesh_pathtbl.c +++ b/net/mac80211/mesh_pathtbl.c @@ -69,8 +69,6 @@ static inline struct mesh_table *resize_dereference_mpp_paths(void) lockdep_is_held(&pathtbl_resize_lock)); } -static int mesh_gate_add(struct mesh_table *tbl, struct mesh_path *mpath); - /* * CAREFUL -- "tbl" must not be an expression, * in particular not an rcu_dereference(), since @@ -420,21 +418,18 @@ static void mesh_gate_node_reclaim(struct rcu_head *rp) } /** - * mesh_gate_add - mark mpath as path to a mesh gate and add to known_gates - * @mesh_tbl: table which contains known_gates list - * @mpath: mpath to known mesh gate - * - * Returns: 0 on success - * + * mesh_path_add_gate - add the given mpath to a mesh gate to our path table + * @mpath: gate path to add to table */ -static int mesh_gate_add(struct mesh_table *tbl, struct mesh_path *mpath) +int mesh_path_add_gate(struct mesh_path *mpath) { + struct mesh_table *tbl; struct mpath_node *gate, *new_gate; struct hlist_node *n; int err; rcu_read_lock(); - tbl = rcu_dereference(tbl); + tbl = rcu_dereference(mesh_paths); hlist_for_each_entry_rcu(gate, n, tbl->known_gates, list) if (gate->mpath == mpath) { @@ -478,8 +473,6 @@ static int mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) struct mpath_node *gate; struct hlist_node *p, *q; - tbl = rcu_dereference(tbl); - hlist_for_each_entry_safe(gate, p, q, tbl->known_gates, list) if (gate->mpath == mpath) { spin_lock_bh(&tbl->gates_lock); @@ -498,16 +491,6 @@ static int mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) } /** - * - * mesh_path_add_gate - add the given mpath to a mesh gate to our path table - * @mpath: gate path to add to table - */ -int mesh_path_add_gate(struct mesh_path *mpath) -{ - return mesh_gate_add(mesh_paths, mpath); -} - -/** * mesh_gate_num - number of gates known to this interface * @sdata: subif data */ |