libertas: fix changing interface type when interface is down

The recent changes to only power the device when the interface up
introduced a bug: changing interface type, legal when the interface
is down, performs device I/O.

Fix this functionality by validating and recording the interface
type when the change is requested, but only applying the change
if/when the interface is brought up.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Acked-by: NDan Williams <dcbw@redhat.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/cfg.c

@@ -1666,28 +1666,20 @@ static int lbs_change_intf(struct wiphy *wiphy, struct net_device *dev,
 	if (dev == priv->mesh_dev)
 		return -EOPNOTSUPP;
 
-	lbs_deb_enter(LBS_DEB_CFG80211);
-
 	switch (type) {
 	case NL80211_IFTYPE_MONITOR:
-		ret = lbs_set_monitor_mode(priv, 1);
-		break;
 	case NL80211_IFTYPE_STATION:
-		if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR)
-			ret = lbs_set_monitor_mode(priv, 0);
-		if (!ret)
-			ret = lbs_set_snmp_mib(priv, SNMP_MIB_OID_BSS_TYPE, 1);
-		break;
 	case NL80211_IFTYPE_ADHOC:
-		if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR)
-			ret = lbs_set_monitor_mode(priv, 0);
-		if (!ret)
-			ret = lbs_set_snmp_mib(priv, SNMP_MIB_OID_BSS_TYPE, 2);
 		break;
 	default:
-		ret = -ENOTSUPP;
+		return -EOPNOTSUPP;
 	}
 
+	lbs_deb_enter(LBS_DEB_CFG80211);
+
+	if (priv->iface_running)
+		ret = lbs_set_iface_type(priv, type);
+
 	if (!ret)
 		priv->wdev->iftype = type;
 

drivers/net/wireless/libertas/decl.h

@@ -9,6 +9,7 @@
 
 #include <linux/netdevice.h>
 #include <linux/firmware.h>
+#include <linux/nl80211.h>
 
 /* Should be terminated by a NULL entry */
 struct lbs_fw_table {
@@ -45,6 +46,7 @@ void lbs_host_to_card_done(struct lbs_private *priv);
 
 int lbs_start_iface(struct lbs_private *priv);
 int lbs_stop_iface(struct lbs_private *priv);
+int lbs_set_iface_type(struct lbs_private *priv, enum nl80211_iftype type);
 
 int lbs_rtap_supported(struct lbs_private *priv);
 

drivers/net/wireless/libertas/main.c

@@ -99,6 +99,32 @@ u8 lbs_data_rate_to_fw_index(u32 rate)
 	return 0;
 }
 
+int lbs_set_iface_type(struct lbs_private *priv, enum nl80211_iftype type)
+{
+	int ret = 0;
+
+	switch (type) {
+	case NL80211_IFTYPE_MONITOR:
+		ret = lbs_set_monitor_mode(priv, 1);
+		break;
+	case NL80211_IFTYPE_STATION:
+		if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR)
+			ret = lbs_set_monitor_mode(priv, 0);
+		if (!ret)
+			ret = lbs_set_snmp_mib(priv, SNMP_MIB_OID_BSS_TYPE, 1);
+		break;
+	case NL80211_IFTYPE_ADHOC:
+		if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR)
+			ret = lbs_set_monitor_mode(priv, 0);
+		if (!ret)
+			ret = lbs_set_snmp_mib(priv, SNMP_MIB_OID_BSS_TYPE, 2);
+		break;
+	default:
+		ret = -ENOTSUPP;
+	}
+	return ret;
+}
+
 int lbs_start_iface(struct lbs_private *priv)
 {
 	struct cmd_ds_802_11_mac_address cmd;
@@ -120,6 +146,12 @@ int lbs_start_iface(struct lbs_private *priv)
 		goto err;
 	}
 
+	ret = lbs_set_iface_type(priv, priv->wdev->iftype);
+	if (ret) {
+		lbs_deb_net("set iface type failed\n");
+		goto err;
+	}
+
 	lbs_update_channel(priv);
 
 	priv->iface_running = true;