[PATCH 10/18] iwlwifi: pcie: lock txq a bit later in reclaim code

[Luca Coelho <luca@coelho.fi>]

From: Sara Sharon <sara.sharon@intel.com>

In reclaim code, we don't need to take the queue lock for
waking the queue. The code section is executed only when
the tx path is stopped, and since the reclaim path is not
executed in parallel to itself, no one can update the queue
pointers, and accessing them is safe without a lock.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/pcie/tx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c
index 3d53842ee60e..ee990a7a5411 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c
@@ -1160,10 +1160,11 @@ void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
 			 */
 			iwl_trans_tx(trans, skb, dev_cmd_ptr, txq_id);
 		}
-		spin_lock_bh(&txq->lock);
 
 		if (iwl_queue_space(trans, txq) > txq->low_mark)
 			iwl_wake_queue(trans, txq);
+
+		spin_lock_bh(&txq->lock);
 	}
 
 	if (txq->read_ptr == txq->write_ptr) {
-- 
2.19.2