mac80211: use RCU for TX aggregation

Currently we allocate some memory for each TX
aggregation session and additionally keep a
state bitmap indicating the state it is in.
By using RCU to protect the pointer, moving
the state into the structure and some locking
trickery we can avoid locking when the TX agg
session is fully operational.

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

1 files changed, 2 insertions, 7 deletions

diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index 2ab106a0a491..1af173ed2d5e 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -176,13 +176,8 @@ void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 
         if (initiator == WLAN_BACK_INITIATOR)
                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0);
-        else { /* WLAN_BACK_RECIPIENT */
-                spin_lock_bh(&sta->lock);
-                if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)
-                        ___ieee80211_stop_tx_ba_session(sta, tid,
-                                                        WLAN_BACK_RECIPIENT);
-                spin_unlock_bh(&sta->lock);
-        }
+        else
+                __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT);
 }
 
 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,