iwlwifi: mvm: synchronize TID queue removal

When we mark a TID as no longer having a queue, there's no
guarantee the TX path isn't using this txq_id right now,
having accessed it just before we reset the value. To fix
this, add synchronize_net() when we change the TIDs from
having a queue to not having one, so that we can then be
sure that the TX path is no longer accessing that queue.

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

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index 1887d2b9f185a7cff4afd1308a86b8853ab66263..c2b7bb5d107cf5707d569b108310b714d065c519 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -545,6 +545,16 @@ static int iwl_mvm_remove_sta_queue_marking(struct iwl_mvm *mvm, int queue)
 
        rcu_read_unlock();
 
+       /*
+        * The TX path may have been using this TXQ_ID from the tid_data,
+        * so make sure it's no longer running so that we can safely reuse
+        * this TXQ later. We've set all the TIDs to IWL_MVM_INVALID_QUEUE
+        * above, but nothing guarantees we've stopped using them. Thus,
+        * without this, we could get to iwl_mvm_disable_txq() and remove
+        * the queue while still sending frames to it.
+        */
+       synchronize_net();
+
        return disable_agg_tids;
 }