mac80211: retransmit TDLS teardown packet through AP if not ACKed

Since the TDLS peer station might not receive the teardown
packet (e.g., when in PS), this makes sure the packet is
retransmitted - this time through the AP - if the TDLS peer
didn't ACK the packet.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 243539878991..11a937f3fdeb 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4003,6 +4003,11 @@ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
         else
                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
+
+        /* Setup TDLS data */
+        spin_lock_init(&ifmgd->teardown_lock);
+        ifmgd->teardown_skb = NULL;
+        ifmgd->orig_teardown_skb = NULL;
 }
 
 /* scan finished notification */
@@ -4865,6 +4870,13 @@ void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
         }
         if (ifmgd->auth_data)
                 ieee80211_destroy_auth_data(sdata, false);
+        spin_lock_bh(&ifmgd->teardown_lock);
+        if (ifmgd->teardown_skb) {
+                kfree_skb(ifmgd->teardown_skb);
+                ifmgd->teardown_skb = NULL;
+                ifmgd->orig_teardown_skb = NULL;
+        }
+        spin_unlock_bh(&ifmgd->teardown_lock);
         del_timer_sync(&ifmgd->timer);
         sdata_unlock(sdata);
 }