[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>

4 files changed, 34 insertions, 18 deletions

diff --git a/drivers/net/wireless/libertas/join.c b/drivers/net/wireless/libertas/join.c
index f9799c3..da47c22 100644
--- a/drivers/net/wireless/libertas/join.c
+++ b/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);
 
-	netif_carrier_on(priv->mesh_dev);
-	netif_wake_queue(priv->mesh_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);
 
-	netif_carrier_on(priv->mesh_dev);
-	netif_wake_queue(priv->mesh_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);
diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 170dc23..b4e2cd1 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -298,10 +298,12 @@ static int libertas_dev_open(struct net_device *dev)
 
 	if (adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_carrier_on(priv->dev);
-		netif_carrier_on(priv->mesh_dev);
+		if (priv->mesh_dev)
+			netif_carrier_on(priv->mesh_dev);
 	} else {
 		netif_carrier_off(priv->dev);
-		netif_carrier_off(priv->mesh_dev);
+		if (priv->mesh_dev)
+			netif_carrier_off(priv->mesh_dev);
 	}
 
 	lbs_deb_leave(LBS_DEB_NET);
@@ -408,7 +410,8 @@ static int libertas_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	netif_stop_queue(priv->dev);
-	netif_stop_queue(priv->mesh_dev);
+	if (priv->mesh_dev)
+		netif_stop_queue(priv->mesh_dev);
 
 	if (libertas_process_tx(priv, skb) == 0)
 		dev->trans_start = jiffies;
@@ -474,7 +477,8 @@ 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);
-		netif_wake_queue(priv->mesh_dev);
+		if (priv->mesh_dev)
+			netif_wake_queue(priv->mesh_dev);
 	}
 
 	lbs_deb_leave(LBS_DEB_TX);
@@ -1254,7 +1258,6 @@ int libertas_add_mesh(wlan_private *priv, struct device *dev)
 	ret = 0;
 	goto done;
 
-
 err_unregister:
 	unregister_netdev(mesh_dev);
 
@@ -1454,7 +1457,8 @@ void libertas_interrupt(struct net_device *dev)
 	if (priv->adapter->psstate == PS_STATE_SLEEP) {
 		priv->adapter->psstate = PS_STATE_AWAKE;
 		netif_wake_queue(dev);
-		netif_wake_queue(priv->mesh_dev);
+		if (priv->mesh_dev)
+			netif_wake_queue(priv->mesh_dev);
 	}
 
 	wake_up_interruptible(&priv->waitq);
diff --git a/drivers/net/wireless/libertas/scan.c b/drivers/net/wireless/libertas/scan.c
index 683fa1b..7f045ec 100644
--- a/drivers/net/wireless/libertas/scan.c
+++ b/drivers/net/wireless/libertas/scan.c
@@ -793,8 +793,10 @@ int wlan_scan_networks(wlan_private * priv,
 	if (!scancurrentchanonly) {
 		netif_stop_queue(priv->dev);
 		netif_carrier_off(priv->dev);
-		netif_stop_queue(priv->mesh_dev);
-		netif_carrier_off(priv->mesh_dev);
+		if (priv->mesh_dev) {
+			netif_stop_queue(priv->mesh_dev);
+			netif_carrier_off(priv->mesh_dev);
+		}
 	}
 
 	ret = wlan_scan_channel_list(priv,
@@ -820,8 +822,10 @@ int wlan_scan_networks(wlan_private * priv,
 	if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_carrier_on(priv->dev);
 		netif_wake_queue(priv->dev);
-		netif_carrier_on(priv->mesh_dev);
-		netif_wake_queue(priv->mesh_dev);
+		if (priv->mesh_dev) {
+			netif_carrier_on(priv->mesh_dev);
+			netif_wake_queue(priv->mesh_dev);
+		}
 	}
 
 out:
diff --git a/drivers/net/wireless/libertas/tx.c b/drivers/net/wireless/libertas/tx.c
index c227102..7c38301 100644
--- a/drivers/net/wireless/libertas/tx.c
+++ b/drivers/net/wireless/libertas/tx.c
@@ -159,7 +159,8 @@ done:
 		skb_orphan(skb);
 		/* stop processing outgoing pkts */
 		netif_stop_queue(priv->dev);
-		netif_stop_queue(priv->mesh_dev);
+		if (priv->mesh_dev)
+			netif_stop_queue(priv->mesh_dev);
 		/* freeze any packets already in our queues */
 		priv->adapter->TxLockFlag = 1;
 	} else {
@@ -198,10 +199,12 @@ 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);
-		netif_stop_queue(priv->mesh_dev);
+		if (priv->mesh_dev)
+			netif_stop_queue(priv->mesh_dev);
 	} else {
 		netif_start_queue(priv->dev);
-		netif_start_queue(priv->mesh_dev);
+		if (priv->mesh_dev)
+			netif_start_queue(priv->mesh_dev);
 	}
 
 	spin_unlock(&adapter->txqueue_lock);
@@ -285,7 +288,8 @@ void libertas_send_tx_feedback(wlan_private * priv)
 	priv->adapter->TxLockFlag = 0;
 	if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_wake_queue(priv->dev);
-		netif_wake_queue(priv->mesh_dev);
+		if (priv->mesh_dev)
+			netif_wake_queue(priv->mesh_dev);
 	}
 }
 EXPORT_SYMBOL_GPL(libertas_send_tx_feedback);