[PATCH 3.9 2/2] iwlwifi: pcie: wake the queue if stopped when being unmapped

[Stanislaw Gruszka]

From: Emmanuel Grumbach <emmanuel.grumbach at intel.com>

When the queue is unmapped while it was so loaded that
mac80211's was stopped, we need to wake the queue after
having freed all the packets in the queue.
Not doing so can result in weird stuff like:

* run lots of traffic (mac80211's queue gets stopped)
* RFKILL
* de-assert RFKILL
* no traffic

Cc: stable at vger.kernel.org
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach at intel.com>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
---
 drivers/net/wireless/iwlwifi/pcie/tx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/iwlwifi/pcie/tx.c b/drivers/net/wireless/iwlwifi/pcie/tx.c
index faaf77c..4e7b8d4 100644
--- a/drivers/net/wireless/iwlwifi/pcie/tx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/tx.c
@@ -585,6 +585,9 @@ static void iwl_pcie_txq_unmap(struct iwl_trans *trans, int txq_id)
 	}
 	txq->active = false;
 	spin_unlock_bh(&txq->lock);
+
+	/* just in case - this queue may have been stopped */
+	iwl_wake_queue(trans, txq);
 }
 
 /*
-- 
1.7.11.7