rtl8180: remove priv->mode

It is only checked in add_interface, and there it is easily replaced
with a check of priv->vif.  If that information should become necessary,
it is available in vif->type anyway.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rtl818x/rtl8180_dev.c b/drivers/net/wireless/rtl818x/rtl8180_dev.c
index 8a40a14..f01f1ef 100644
--- a/drivers/net/wireless/rtl818x/rtl8180_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8180_dev.c
@@ -82,8 +82,6 @@
 };
 
 
-
-
 void rtl8180_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data)
 {
 	struct rtl8180_priv *priv = dev->priv;
@@ -615,7 +613,6 @@
 	reg |= RTL818X_CMD_TX_ENABLE;
 	rtl818x_iowrite8(priv, &priv->map->CMD, reg);
 
-	priv->mode = NL80211_IFTYPE_MONITOR;
 	return 0;
 
  err_free_rings:
@@ -633,8 +630,6 @@
 	u8 reg;
 	int i;
 
-	priv->mode = NL80211_IFTYPE_UNSPECIFIED;
-
 	rtl818x_iowrite16(priv, &priv->map->INT_MASK, 0);
 
 	reg = rtl818x_ioread8(priv, &priv->map->CMD);
@@ -661,12 +656,14 @@
 {
 	struct rtl8180_priv *priv = dev->priv;
 
-	if (priv->mode != NL80211_IFTYPE_MONITOR)
-		return -EOPNOTSUPP;
+	/*
+	 * We only support one active interface at a time.
+	 */
+	if (priv->vif)
+		return -EBUSY;
 
 	switch (conf->type) {
 	case NL80211_IFTYPE_STATION:
-		priv->mode = conf->type;
 		break;
 	default:
 		return -EOPNOTSUPP;
@@ -688,7 +685,6 @@
 				     struct ieee80211_if_init_conf *conf)
 {
 	struct rtl8180_priv *priv = dev->priv;
-	priv->mode = NL80211_IFTYPE_MONITOR;
 	priv->vif = NULL;
 }