[PATCH 3.3] rt2x00: fix random stalls

[Stanislaw Gruszka <sgruszka@redhat.com>]

Is possible that we stop queue and then do not wake up it again,
especially when packets are transmitted fast. That can be easily
reproduced with modified tx queue entry_num to some small value e.g. 16.

If mac80211 already hold local->queue_stop_reason_lock, then we can wait
on that lock in both rt2x00queue_pause_queue() and
rt2x00queue_unpause_queue(). After drooping ->queue_stop_reason_lock
is possible that __ieee80211_wake_queue() will be performed before
__ieee80211_stop_queue(), hence we stop queue and newer wake up it
again.

To prevent stalls serialize pause/unpause by queue->tx_lock.

Cc: stable@vger.kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
 drivers/net/wireless/rt2x00/rt2x00dev.c |   10 ++++++++--
 drivers/net/wireless/rt2x00/rt2x00mac.c |   10 +++++++++-
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 49a51b4..6c64658 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -430,10 +430,16 @@ void rt2x00lib_txdone(struct queue_entry *entry,
 	/*
 	 * If the data queue was below the threshold before the txdone
 	 * handler we must make sure the packet queue in the mac80211 stack
-	 * is reenabled when the txdone handler has finished.
+	 * is reenabled when the txdone handler has finished. This has to be
+	 * serialized with rt2x00mac_tx, otherwise we can wake up mac80211
+	 * queue before it was stopped if someone else hold mac80211 internal
+	 * local->queue_stop_reason_lock .
 	 */
-	if (!rt2x00queue_threshold(entry->queue))
+	if (!rt2x00queue_threshold(entry->queue)) {
+		spin_lock_irq(&entry->queue->tx_lock);
 		rt2x00queue_unpause_queue(entry->queue);
+		spin_unlock_irq(&entry->queue->tx_lock);
+	}
 }
 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 
diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index ede3c58..2880512 100644
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -152,13 +152,21 @@ void rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
 	if (unlikely(rt2x00queue_write_tx_frame(queue, skb, false)))
 		goto exit_fail;
 
-	if (rt2x00queue_threshold(queue))
+	/*
+	 * Pausing queue has to be serialized with rt2x00lib_txdone .
+	 */
+	if (rt2x00queue_threshold(queue)) {
+		spin_lock(&queue->tx_lock);
 		rt2x00queue_pause_queue(queue);
+		spin_unlock(&queue->tx_lock);
+	}
 
 	return;
 
  exit_fail:
+	spin_lock(&queue->tx_lock);
 	rt2x00queue_pause_queue(queue);
+	spin_unlock(&queue->tx_lock);
  exit_free_skb:
 	ieee80211_free_txskb(hw, skb);
 }
-- 
1.7.1