iwlwifi: mvm: kill INACTIVE queue state

We don't really need this state: instead of having an inactive
state where we can awaken zombie queues again if needed, just
keep them in their normal state unless a new queue is actually
needed and there's no other way of getting one.

We do this here by making the inactivity check not free queues
unless instructed that we now really need to allocate one to a
specific station, and in that case it'll just free the queue
immediately, without doing any inactivity step inbetween.

The only downside is a little bit more processing in this case,
but the code complexity is lower.

Additionally, this fixes a corner case: due to the way the code
worked, we could only ever reuse an inactive queue if it was
the reserved queue for a station, as iwl_mvm_find_free_queue()
would never consider returning an inactive queue.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 9 insertions, 25 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
index 99c64ea2619b..ec57682efe54 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
@@ -1140,32 +1140,16 @@ static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
 	WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
 
 	/* Check if TXQ needs to be allocated or re-activated */
-	if (unlikely(txq_id == IWL_MVM_INVALID_QUEUE ||
-		     !mvmsta->tid_data[tid].is_tid_active)) {
-		/* If TXQ needs to be allocated... */
-		if (txq_id == IWL_MVM_INVALID_QUEUE) {
-			iwl_mvm_tx_add_stream(mvm, mvmsta, tid, skb);
+	if (unlikely(txq_id == IWL_MVM_INVALID_QUEUE)) {
+		iwl_mvm_tx_add_stream(mvm, mvmsta, tid, skb);
 
-			/*
-			 * The frame is now deferred, and the worker scheduled
-			 * will re-allocate it, so we can free it for now.
-			 */
-			iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
-			spin_unlock(&mvmsta->lock);
-			return 0;
-		}
-
-		/* queue should always be active in new TX path */
-		WARN_ON(iwl_mvm_has_new_tx_api(mvm));
-
-		/* If we are here - TXQ exists and needs to be re-activated */
-		spin_lock(&mvm->queue_info_lock);
-		mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_READY;
-		mvmsta->tid_data[tid].is_tid_active = true;
-		spin_unlock(&mvm->queue_info_lock);
-
-		IWL_DEBUG_TX_QUEUES(mvm, "Re-activating queue %d for TX\n",
-				    txq_id);
+		/*
+		 * The frame is now deferred, and the worker scheduled
+		 * will re-allocate it, so we can free it for now.
+		 */
+		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
+		spin_unlock(&mvmsta->lock);
+		return 0;
 	}
 
 	if (!iwl_mvm_has_new_tx_api(mvm)) {