ath6kl: Introduce spinlock to protect vif specific information

Use this spinlock to protect the vif's data instead of
one from ath6kl.
Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath6kl/cfg80211.c

@@ -2077,6 +2077,7 @@ static int ath6kl_init_if_data(struct ath6kl_vif *vif)
 	setup_timer(&vif->disconnect_timer, disconnect_timer_handler,
 		    (unsigned long) vif->ndev);
 	set_bit(WMM_ENABLED, &vif->flags);
+	spin_lock_init(&vif->if_lock);
 
 	return 0;
 }

drivers/net/wireless/ath/ath6kl/core.h

@@ -400,6 +400,8 @@ struct ath6kl_vif {
 	struct wireless_dev wdev;
 	struct net_device *ndev;
 	struct ath6kl *ar;
+	/* Lock to protect vif specific net_stats and flags */
+	spinlock_t if_lock;
 	u8 fw_vif_idx;
 	unsigned long flags;
 	int ssid_len;

drivers/net/wireless/ath/ath6kl/main.c

@@ -989,11 +989,11 @@ void ath6kl_connect_event(struct ath6kl_vif *vif, u16 channel, u8 *bssid,
 	netif_wake_queue(vif->ndev);
 
 	/* Update connect & link status atomically */
-	spin_lock_bh(&ar->lock);
+	spin_lock_bh(&vif->if_lock);
 	set_bit(CONNECTED, &vif->flags);
 	clear_bit(CONNECT_PEND, &vif->flags);
 	netif_carrier_on(vif->ndev);
-	spin_unlock_bh(&ar->lock);
+	spin_unlock_bh(&vif->if_lock);
 
 	aggr_reset_state(vif->aggr_cntxt);
 	vif->reconnect_flag = 0;
@@ -1345,10 +1345,10 @@ void ath6kl_disconnect_event(struct ath6kl_vif *vif, u8 reason, u8 *bssid,
 	}
 
 	/* update connect & link status atomically */
-	spin_lock_bh(&ar->lock);
+	spin_lock_bh(&vif->if_lock);
 	clear_bit(CONNECTED, &vif->flags);
 	netif_carrier_off(vif->ndev);
-	spin_unlock_bh(&ar->lock);
+	spin_unlock_bh(&vif->if_lock);
 
 	if ((reason != CSERV_DISCONNECT) || (vif->reconnect_flag != 1))
 		vif->reconnect_flag = 0;
@@ -1365,11 +1365,8 @@ void ath6kl_disconnect_event(struct ath6kl_vif *vif, u8 reason, u8 *bssid,
 
 static int ath6kl_open(struct net_device *dev)
 {
-	struct ath6kl *ar = ath6kl_priv(dev);
 	struct ath6kl_vif *vif = netdev_priv(dev);
 
-	spin_lock_bh(&ar->lock);
-
 	set_bit(WLAN_ENABLED, &vif->flags);
 
 	if (test_bit(CONNECTED, &vif->flags)) {
@@ -1378,8 +1375,6 @@ static int ath6kl_open(struct net_device *dev)
 	} else
 		netif_carrier_off(dev);
 
-	spin_unlock_bh(&ar->lock);
-
 	return 0;
 }
 

drivers/net/wireless/ath/ath6kl/txrx.c

@@ -475,9 +475,9 @@ enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
 		return HTC_SEND_FULL_DROP;
 
 stop_net_queues:
-	spin_lock_bh(&ar->lock);
+	spin_lock_bh(&vif->if_lock);
 	set_bit(NETQ_STOPPED, &vif->flags);
-	spin_unlock_bh(&ar->lock);
+	spin_unlock_bh(&vif->if_lock);
 	netif_stop_queue(vif->ndev);
 
 	return HTC_SEND_FULL_KEEP;
@@ -1103,12 +1103,12 @@ void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
 	 * Take lock to protect buffer counts and adaptive power throughput
 	 * state.
 	 */
-	spin_lock_bh(&ar->lock);
+	spin_lock_bh(&vif->if_lock);
 
 	vif->net_stats.rx_packets++;
 	vif->net_stats.rx_bytes += packet->act_len;
 
-	spin_unlock_bh(&ar->lock);
+	spin_unlock_bh(&vif->if_lock);
 
 
 	ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",