+static void iwl_mvm_sta_pre_rcu_remove(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta)
+{
+ struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
+ struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
+
+ /*
+ * This is called before mac80211 does RCU synchronisation,
+ * so here we already invalidate our internal RCU-protected
+ * station pointer. The rest of the code will thus no longer
+ * be able to find the station this way, and we don't rely
+ * on further RCU synchronisation after the sta_state()
+ * callback deleted the station.
+ */
+ mutex_lock(&mvm->mutex);
+ if (sta == rcu_access_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id]))
+ rcu_assign_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id],
+ ERR_PTR(-ENOENT));
+ mutex_unlock(&mvm->mutex);
+}
+