mac80211: add tx dequeue function for process context

 * but for the duration of the frame handling.

 * However, also note that while in the wake_tx_queue() method,

 * rcu_read_lock() is already held.

 *

 * softirqs must also be disabled when this function is called.

 * In process context, use ieee80211_tx_dequeue_ni() instead.

 */

struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,

				     struct ieee80211_txq *txq);

/**

 * ieee80211_tx_dequeue_ni - dequeue a packet from a software tx queue

 * (in process context)

 *

 * Like ieee80211_tx_dequeue() but can be called in process context

 * (internally disables bottom halves).

 *

 * @hw: pointer as obtained from ieee80211_alloc_hw()

 * @txq: pointer obtained from station or virtual interface, or from

 *	ieee80211_next_txq()

 */

static inline struct sk_buff *ieee80211_tx_dequeue_ni(struct ieee80211_hw *hw,

						      struct ieee80211_txq *txq)

{

	struct sk_buff *skb;

	local_bh_disable();

	skb = ieee80211_tx_dequeue(hw, txq);

	local_bh_enable();

	return skb;

}

/**

 * ieee80211_next_txq - get next tx queue to pull packets from

 *

	ieee80211_tx_result r;

	struct ieee80211_vif *vif = txq->vif;

	WARN_ON_ONCE(softirq_count() == 0);

begin:

	spin_lock_bh(&fq->lock);