1 files changed, 37 insertions, 24 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 9b2cc278ac2a..705ef1d040ed 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -6,6 +6,7 @@
  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright (C) 2015 Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -538,11 +539,16 @@ static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 	ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 }
 
+/* This function determines vht capability flags for the association
+ * and builds the IE.
+ * Note - the function may set the owner of the MU-MIMO capability
+ */
 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 				 struct sk_buff *skb,
 				 struct ieee80211_supported_band *sband,
 				 struct ieee80211_vht_cap *ap_vht_cap)
 {
+	struct ieee80211_local *local = sdata->local;
 	u8 *pos;
 	u32 cap;
 	struct ieee80211_sta_vht_cap vht_cap;
@@ -576,7 +582,34 @@ static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 	 */
 	if (!(ap_vht_cap->vht_cap_info &
 			cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
-		cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
+		cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
+			 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
+	else if (!(ap_vht_cap->vht_cap_info &
+			cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
+		cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
+
+	/*
+	 * If some other vif is using the MU-MIMO capablity we cannot associate
+	 * using MU-MIMO - this will lead to contradictions in the group-id
+	 * mechanism.
+	 * Ownership is defined since association request, in order to avoid
+	 * simultaneous associations with MU-MIMO.
+	 */
+	if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
+		bool disable_mu_mimo = false;
+		struct ieee80211_sub_if_data *other;
+
+		list_for_each_entry_rcu(other, &local->interfaces, list) {
+			if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
+				disable_mu_mimo = true;
+				break;
+			}
+		}
+		if (disable_mu_mimo)
+			cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
+		else
+			sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
+	}
 
 	mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 
@@ -1096,24 +1129,6 @@ static void ieee80211_chswitch_timer(unsigned long data)
 	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
 }
 
-static void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
-{
-	struct sta_info *sta;
-	u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
-		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
-		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
-			continue;
-
-		ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
-					    NL80211_TDLS_TEARDOWN, reason,
-					    GFP_ATOMIC);
-	}
-	rcu_read_unlock();
-}
-
 static void
 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 				 u64 timestamp, u32 device_timestamp,
@@ -2076,6 +2091,7 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
 	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
 	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
+	sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
 
 	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
 
@@ -2538,6 +2554,7 @@ static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
 		eth_zero_addr(sdata->u.mgd.bssid);
 		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
 		sdata->u.mgd.flags = 0;
+		sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
 		mutex_lock(&sdata->local->mtx);
 		ieee80211_vif_release_channel(sdata);
 		mutex_unlock(&sdata->local->mtx);
@@ -3034,12 +3051,8 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 
 	rate_control_rate_init(sta);
 
-	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
+	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
 		set_sta_flag(sta, WLAN_STA_MFP);
-		sta->sta.mfp = true;
-	} else {
-		sta->sta.mfp = false;
-	}
 
 	sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;