MAX_TX_BUF_NUM
if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
#define ATH9K_HTC_TX_THRESHOLD (MAX_TX_BUF_NUM - ATH9K_HTC_TX_RESERVE)
DECLARE_BITMAP(tx_slot, MAX_TX_BUF_NUM);
MAX_TX_BUF_NUM, priv->tx.tx_slot,
bitmap_weight(priv->tx.tx_slot, MAX_TX_BUF_NUM));
slot = find_first_zero_bit(priv->tx.tx_slot, MAX_TX_BUF_NUM);
if (slot >= MAX_TX_BUF_NUM) {