[PATCH 2/5] iwlwifi: mvm: clear tx queue id when unreserving aggregation queue

[Luca Coelho]

From: Avraham Stern <avraham.st...@intel.com>

When a queue is reserved for aggregation, the queue id is assigned
to the tid_data. This is fine since iwl_mvm_sta_tx_agg_oper()
takes care of allocating the queue before actual tx starts.
When the reservation is cancelled (e.g. when the AP declined the
aggregation request) the tid_data is not cleared. As a result,
following tx for this tid was trying to use an unallocated queue.

Fix this by setting the txq_id for the tid to invalid when unreserving
the queue.

Signed-off-by: Avraham Stern <avraham.st...@intel.com>
Signed-off-by: Luca Coelho <luciano.coe...@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c 
b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index 5be4bae5b70d..0b3a780aee12 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -2696,8 +2696,10 @@ int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct 
ieee80211_vif *vif,
 
 static void iwl_mvm_unreserve_agg_queue(struct iwl_mvm *mvm,
                                        struct iwl_mvm_sta *mvmsta,
-                                       u16 txq_id)
+                                       struct iwl_mvm_tid_data *tid_data)
 {
+       u16 txq_id = tid_data->txq_id;
+
        if (iwl_mvm_has_new_tx_api(mvm))
                return;
 
@@ -2709,8 +2711,10 @@ static void iwl_mvm_unreserve_agg_queue(struct iwl_mvm 
*mvm,
         * allocated through iwl_mvm_enable_txq, so we can just mark it back as
         * free.
         */
-       if (mvm->queue_info[txq_id].status == IWL_MVM_QUEUE_RESERVED)
+       if (mvm->queue_info[txq_id].status == IWL_MVM_QUEUE_RESERVED) {
                mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_FREE;
+               tid_data->txq_id = IWL_MVM_INVALID_QUEUE;
+       }
 
        spin_unlock_bh(&mvm->queue_info_lock);
 }
@@ -2741,7 +2745,7 @@ int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct 
ieee80211_vif *vif,
 
        mvmsta->agg_tids &= ~BIT(tid);
 
-       iwl_mvm_unreserve_agg_queue(mvm, mvmsta, txq_id);
+       iwl_mvm_unreserve_agg_queue(mvm, mvmsta, tid_data);
 
        switch (tid_data->state) {
        case IWL_AGG_ON:
@@ -2808,7 +2812,7 @@ int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct 
ieee80211_vif *vif,
        mvmsta->agg_tids &= ~BIT(tid);
        spin_unlock_bh(&mvmsta->lock);
 
-       iwl_mvm_unreserve_agg_queue(mvm, mvmsta, txq_id);
+       iwl_mvm_unreserve_agg_queue(mvm, mvmsta, tid_data);
 
        if (old_state >= IWL_AGG_ON) {
                iwl_mvm_drain_sta(mvm, mvmsta, true);
-- 
2.16.2