mac80211: RCU-ify STA info structure access

This makes access to the STA hash table/list use RCU to protect
against freeing of items. However, it's not a true RCU, the
copy step is missing: whenever somebody changes a STA item it
is simply updated. This is an existing race condition that is
now somewhat understandable.

This patch also fixes the race key freeing vs. STA destruction
by making sure that sta_info_destroy() is always called under
RTNL and frees the key.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index ebe1a7a80bad..9de1ccc11cf9 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -83,11 +83,10 @@ bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie,
 /**
  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
  *
- * @dev: mesh interface in which mesh beacons are going to be updated
+ * @sdata: mesh interface in which mesh beacons are going to be updated
  */
-void mesh_accept_plinks_update(struct net_device *dev)
+void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 {
-        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
         bool free_plinks;
 
         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,