This patch takes care of Johannes' deadlock report by moving the
mutex_lock right after cancel_work_sync in ar9170_op_stop.
Besides, the janitor does not need to hold the mutex anymore,
so this extra lines can be removed as well.
Signed-off-by: Christian Lamparter <[email protected]>
---
diff --git a/drivers/net/wireless/ath/ar9170/main.c b/drivers/net/wireless/ath/ar9170/main.c
index 1657e89..63528f1 100644
--- a/drivers/net/wireless/ath/ar9170/main.c
+++ b/drivers/net/wireless/ath/ar9170/main.c
@@ -343,7 +343,6 @@ static void ar9170_tx_status_janitor(struct work_struct *work)
if (unlikely(!IS_STARTED(ar)))
return ;
- mutex_lock(&ar->mutex);
/* recycle the garbage back to mac80211... one by one. */
while ((skb = skb_dequeue(&ar->global_tx_status_waste))) {
#ifdef AR9170_QUEUE_DEBUG
@@ -369,8 +368,6 @@ static void ar9170_tx_status_janitor(struct work_struct *work)
if (skb_queue_len(&ar->global_tx_status_waste) > 0)
queue_delayed_work(ar->hw->workqueue, &ar->tx_status_janitor,
msecs_to_jiffies(100));
-
- mutex_unlock(&ar->mutex);
}
static void ar9170_handle_command_response(struct ar9170 *ar,
@@ -1013,10 +1010,10 @@ static void ar9170_op_stop(struct ieee80211_hw *hw)
flush_workqueue(ar->hw->workqueue);
- mutex_lock(&ar->mutex);
cancel_delayed_work_sync(&ar->tx_status_janitor);
cancel_work_sync(&ar->filter_config_work);
cancel_work_sync(&ar->beacon_work);
+ mutex_lock(&ar->mutex);
skb_queue_purge(&ar->global_tx_status_waste);
skb_queue_purge(&ar->global_tx_status);