ar9170: atomic pending A-MPDU counter
A ref-counting bug emerged after testing ar9170usb's HT implementation on a bigger SMP/SMT system without the usual _debugging_ overhead. Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -231,7 +231,7 @@ struct ar9170 {
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struct sk_buff_head tx_status_ampdu;
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spinlock_t tx_ampdu_list_lock;
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struct list_head tx_ampdu_list;
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unsigned int tx_ampdu_pending;
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atomic_t tx_ampdu_pending;
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/* rxstream mpdu merge */
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struct ar9170_rxstream_mpdu_merge rx_mpdu;
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@ -414,9 +414,9 @@ static void ar9170_tx_ampdu_callback(struct ar9170 *ar, struct sk_buff *skb)
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skb_queue_tail(&ar->tx_status_ampdu, skb);
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ar9170_tx_fake_ampdu_status(ar);
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ar->tx_ampdu_pending--;
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if (!list_empty(&ar->tx_ampdu_list) && !ar->tx_ampdu_pending)
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if (atomic_dec_and_test(&ar->tx_ampdu_pending) &&
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!list_empty(&ar->tx_ampdu_list))
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ar9170_tx_ampdu(ar);
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}
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@ -1248,6 +1248,7 @@ static int ar9170_op_start(struct ieee80211_hw *hw)
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ar->global_ampdu_density = 6;
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ar->global_ampdu_factor = 3;
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atomic_set(&ar->tx_ampdu_pending, 0);
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ar->bad_hw_nagger = jiffies;
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err = ar->open(ar);
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@ -1773,7 +1774,7 @@ static void ar9170_tx(struct ar9170 *ar)
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msecs_to_jiffies(AR9170_TX_TIMEOUT);
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if (arinfo->flags == AR9170_TX_FLAG_BLOCK_ACK)
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ar->tx_ampdu_pending++;
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atomic_inc(&ar->tx_ampdu_pending);
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#ifdef AR9170_QUEUE_DEBUG
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printk(KERN_DEBUG "%s: send frame q:%d =>\n",
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@ -1784,7 +1785,7 @@ static void ar9170_tx(struct ar9170 *ar)
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err = ar->tx(ar, skb);
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if (unlikely(err)) {
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if (arinfo->flags == AR9170_TX_FLAG_BLOCK_ACK)
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ar->tx_ampdu_pending--;
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atomic_dec(&ar->tx_ampdu_pending);
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frames_failed++;
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dev_kfree_skb_any(skb);
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@ -1931,7 +1932,7 @@ int ar9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
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if (info->flags & IEEE80211_TX_CTL_AMPDU) {
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bool run = ar9170_tx_ampdu_queue(ar, skb);
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if (run || !ar->tx_ampdu_pending)
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if (run || !atomic_read(&ar->tx_ampdu_pending))
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ar9170_tx_ampdu(ar);
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} else {
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unsigned int queue = skb_get_queue_mapping(skb);
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