iwlwifi: mvm: clean up SSN incrementation

Sometimes, due to SCD bug, we need to start the queue with an
higher SSN. The queue allocation function currently increments
the SSN in the packet itself, but it is pointless, since this
value is overridden later by iwl_mvm_tx_mpdu with the value
from mvmsta->tid_data[tid].seq_number. Updating tid data is
sufficient.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index e821948..e280098 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -1254,6 +1254,7 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm,
 
        spin_lock_bh(&mvmsta->lock);
        tfd_queue_mask = mvmsta->tfd_queue_msk;
+       ssn = IEEE80211_SEQ_TO_SN(mvmsta->tid_data[tid].seq_number);
        spin_unlock_bh(&mvmsta->lock);
 
        /*
@@ -1340,13 +1341,8 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm,
                }
        }
 
-       ssn = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
        inc_ssn = iwl_mvm_enable_txq(mvm, queue, mac_queue,
                                     ssn, &cfg, wdg_timeout);
-       if (inc_ssn) {
-               ssn = (ssn + 1) & IEEE80211_SCTL_SEQ;
-               le16_add_cpu(&hdr->seq_ctrl, 0x10);
-       }
 
        /*
         * Mark queue as shared in transport if shared
@@ -1363,8 +1359,10 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm,
         * this ra/tid in our Tx path since we stop the Qdisc when we
         * need to allocate a new TFD queue.
         */
-       if (inc_ssn)
+       if (inc_ssn) {
                mvmsta->tid_data[tid].seq_number += 0x10;
+               ssn = (ssn + 1) & IEEE80211_SCTL_SEQ;
+       }
        mvmsta->tid_data[tid].txq_id = queue;
        mvmsta->tfd_queue_msk |= BIT(queue);
        queue_state = mvmsta->tid_data[tid].state;