mac80211: Fix rate reporting regression

Mattias Nissler's "clean up rate selection" patch incorrectly changes
the behavior of txrate setting in sta_info. This patch backs out parts
of the rate selection consolidation in order to fix this issue for now.

Signed-off-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
index 3e81274..d79f18c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
@@ -657,14 +657,20 @@
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	struct sta_info *sta;
-	u16 rate_mask;
+	u16 fc, rate_mask;
 	struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate;
 	DECLARE_MAC_BUF(mac);
 
 	IWL_DEBUG_RATE("enter\n");
 
 	sta = sta_info_get(local, hdr->addr1);
-	if (!sta || !sta->rate_ctrl_priv) {
+
+	/* Send management frames and broadcast/multicast data using lowest
+	 * rate. */
+	fc = le16_to_cpu(hdr->frame_control);
+	if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
+	    is_multicast_ether_addr(hdr->addr1) ||
+	    !sta || !sta->rate_ctrl_priv) {
 		IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
 		sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
 		if (sta)