iwlwifi: add missing rcu_read_lock

Commit Message

Johannes Berg June 7, 2010, 7:20 p.m. UTC

None

Patch

--- wireless-testing.orig/drivers/net/wireless/iwlwifi/iwl-agn-tx.c	2010-06-07 21:17:56.000000000 +0200
+++ wireless-testing/drivers/net/wireless/iwlwifi/iwl-agn-tx.c	2010-06-07 21:18:04.000000000 +0200
@@ -1146,6 +1146,7 @@  static void iwlagn_tx_status(struct iwl_
 	struct ieee80211_sta *sta;
 	struct iwl_station_priv *sta_priv;
 
+	rcu_read_lock();
 	sta = ieee80211_find_sta(priv->vif, hdr->addr1);
 	if (sta) {
 		sta_priv = (void *)sta->drv_priv;
@@ -1154,6 +1155,7 @@  static void iwlagn_tx_status(struct iwl_
 		    atomic_dec_return(&sta_priv->pending_frames) == 0)
 			ieee80211_sta_block_awake(priv->hw, sta, false);
 	}
+	rcu_read_unlock();
 
 	ieee80211_tx_status_irqsafe(priv->hw, skb);
 }