iwlwifi: return 0 for AMPDU_TX/RX_STOP request if NIC is going down

When receive IEEE80211_AMPDU_RX_STOP or IEEE80211_AMPDU_TX_STOP request
in iwl_mac_ampdu_action() from mac80211; check STATUS_EXIT_PENDING bit,
if NIC is on the way out, then return 0 back to mac80211, this can
prevent mac80211 report HW error incorrectly.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 4d2ed52af160..c1482852ea41 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2683,6 +2683,7 @@ static int iwl_mac_ampdu_action(struct ieee80211_hw *hw,
                              struct ieee80211_sta *sta, u16 tid, u16 *ssn)
 {
         struct iwl_priv *priv = hw->priv;
+        int ret;
 
         IWL_DEBUG_HT(priv, "A-MPDU action on addr %pM tid %d\n",
                      sta->addr, tid);
@@ -2696,13 +2697,21 @@ static int iwl_mac_ampdu_action(struct ieee80211_hw *hw,
                 return iwl_sta_rx_agg_start(priv, sta->addr, tid, *ssn);
         case IEEE80211_AMPDU_RX_STOP:
                 IWL_DEBUG_HT(priv, "stop Rx\n");
-                return iwl_sta_rx_agg_stop(priv, sta->addr, tid);
+                ret = iwl_sta_rx_agg_stop(priv, sta->addr, tid);
+                if (test_bit(STATUS_EXIT_PENDING, &priv->status))
+                        return 0;
+                else
+                        return ret;
         case IEEE80211_AMPDU_TX_START:
                 IWL_DEBUG_HT(priv, "start Tx\n");
                 return iwl_tx_agg_start(priv, sta->addr, tid, ssn);
         case IEEE80211_AMPDU_TX_STOP:
                 IWL_DEBUG_HT(priv, "stop Tx\n");
-                return iwl_tx_agg_stop(priv, sta->addr, tid);
+                ret = iwl_tx_agg_stop(priv, sta->addr, tid);
+                if (test_bit(STATUS_EXIT_PENDING, &priv->status))
+                        return 0;
+                else
+                        return ret;
         default:
                 IWL_DEBUG_HT(priv, "unknown\n");
                 return -EINVAL;