void ieee80211_clear_fast_xmit(struct sta_info *sta)
{
	struct ieee80211_fast_tx *fast_tx;

	spin_lock_bh(&sta->lock);
	fast_tx = rcu_dereference_protected(sta->fast_tx,
					    lockdep_is_held(&sta->lock));
	RCU_INIT_POINTER(sta->fast_tx, NULL);
	spin_unlock_bh(&sta->lock);

	if (fast_tx)
		kfree_rcu(fast_tx, rcu_head);
}
void ieee80211_clear_fast_xmit(struct sta_info *sta)
{
	struct ieee80211_fast_tx *fast_tx;

	spin_lock_bh(&sta->lock);
	fast_tx = rcu_dereference_protected(sta->fast_tx,
					    lockdep_is_held(&sta->lock));
	RCU_INIT_POINTER(sta->fast_tx, NULL);
	spin_unlock_bh(&sta->lock);

	if (fast_tx)
		kfree_rcu(fast_tx, rcu_head);
}