diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 35b07ea..db82da9 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -324,15 +324,10 @@
 					     struct net_device *dev,
 					     u8 key_idx)
 {
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 
-	rcu_read_lock();
-
-	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	ieee80211_set_default_mgmt_key(sdata, key_idx);
 
-	rcu_read_unlock();
-
 	return 0;
 }