[PATCH] libertas: access mesh_dev more carefully

The CF/SDIO firmware doesn't support Mesh, so priv->mesh_dev is
NULL there. Protect all accesses.
Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/join.c

@@ -739,8 +739,10 @@ int libertas_ret_80211_associate(wlan_private * priv,
 	netif_carrier_on(priv->dev);
 	netif_wake_queue(priv->dev);
 
+	if (priv->mesh_dev) {
 		netif_carrier_on(priv->mesh_dev);
 		netif_wake_queue(priv->mesh_dev);
+	}
 
 	lbs_deb_join("ASSOC_RESP: Associated \n");
 
@@ -827,8 +829,10 @@ int libertas_ret_80211_ad_hoc_start(wlan_private * priv,
 	netif_carrier_on(priv->dev);
 	netif_wake_queue(priv->dev);
 
+	if (priv->mesh_dev) {
 		netif_carrier_on(priv->mesh_dev);
 		netif_wake_queue(priv->mesh_dev);
+	}
 
 	memset(&wrqu, 0, sizeof(wrqu));
 	memcpy(wrqu.ap_addr.sa_data, adapter->curbssparams.bssid, ETH_ALEN);

drivers/net/wireless/libertas/main.c

@@ -298,9 +298,11 @@ static int libertas_dev_open(struct net_device *dev)
 
 	if (adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_carrier_on(priv->dev);
+		if (priv->mesh_dev)
 			netif_carrier_on(priv->mesh_dev);
 	} else {
 		netif_carrier_off(priv->dev);
+		if (priv->mesh_dev)
 			netif_carrier_off(priv->mesh_dev);
 	}
 
@@ -408,6 +410,7 @@ static int libertas_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	netif_stop_queue(priv->dev);
+	if (priv->mesh_dev)
 		netif_stop_queue(priv->mesh_dev);
 
 	if (libertas_process_tx(priv, skb) == 0)
@@ -474,6 +477,7 @@ static void libertas_tx_timeout(struct net_device *dev)
 			wake_up_interruptible(&priv->waitq);
 	} else if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_wake_queue(priv->dev);
+		if (priv->mesh_dev)
 			netif_wake_queue(priv->mesh_dev);
 	}
 
@@ -1254,7 +1258,6 @@ int libertas_add_mesh(wlan_private *priv, struct device *dev)
 	ret = 0;
 	goto done;
 
-
 err_unregister:
 	unregister_netdev(mesh_dev);
 
@@ -1454,6 +1457,7 @@ void libertas_interrupt(struct net_device *dev)
 	if (priv->adapter->psstate == PS_STATE_SLEEP) {
 		priv->adapter->psstate = PS_STATE_AWAKE;
 		netif_wake_queue(dev);
+		if (priv->mesh_dev)
 			netif_wake_queue(priv->mesh_dev);
 	}
 

drivers/net/wireless/libertas/scan.c

@@ -793,9 +793,11 @@ int wlan_scan_networks(wlan_private * priv,
 	if (!scancurrentchanonly) {
 		netif_stop_queue(priv->dev);
 		netif_carrier_off(priv->dev);
+		if (priv->mesh_dev) {
 			netif_stop_queue(priv->mesh_dev);
 			netif_carrier_off(priv->mesh_dev);
 		}
+	}
 
 	ret = wlan_scan_channel_list(priv,
 				     maxchanperscan,
@@ -820,9 +822,11 @@ int wlan_scan_networks(wlan_private * priv,
 	if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_carrier_on(priv->dev);
 		netif_wake_queue(priv->dev);
+		if (priv->mesh_dev) {
 			netif_carrier_on(priv->mesh_dev);
 			netif_wake_queue(priv->mesh_dev);
 		}
+	}
 
 out:
 	if (scan_cfg)

drivers/net/wireless/libertas/tx.c

@@ -159,6 +159,7 @@ static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb)
 		skb_orphan(skb);
 		/* stop processing outgoing pkts */
 		netif_stop_queue(priv->dev);
+		if (priv->mesh_dev)
 			netif_stop_queue(priv->mesh_dev);
 		/* freeze any packets already in our queues */
 		priv->adapter->TxLockFlag = 1;
@@ -198,9 +199,11 @@ static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb)
 	adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb;
 	if (adapter->tx_queue_idx == NR_TX_QUEUE) {
 		netif_stop_queue(priv->dev);
+		if (priv->mesh_dev)
 			netif_stop_queue(priv->mesh_dev);
 	} else {
 		netif_start_queue(priv->dev);
+		if (priv->mesh_dev)
 			netif_start_queue(priv->mesh_dev);
 	}
 
@@ -285,6 +288,7 @@ void libertas_send_tx_feedback(wlan_private * priv)
 	priv->adapter->TxLockFlag = 0;
 	if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_wake_queue(priv->dev);
+		if (priv->mesh_dev)
 			netif_wake_queue(priv->mesh_dev);
 	}
 }