iwlwifi: don't accept Tx packets when draining HW queues

If the agg SM is in IWL_EMPTYING_HW_QUEUE_ADDBA or in
IWL_EMPTYING_HW_QUEUE_DELBA, we are not supposed to get Tx packets
from mac80211. mac80211 is supposed to buffer these packets for us.
A few issues have been identified in this mechanism, not all of them
were fixed.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
index ae35c537b58c..c664c2726553 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
@@ -388,6 +388,14 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
                         goto drop_unlock_sta;
                 }
 
+                /* We can receive packets from the stack in IWL_AGG_{ON,OFF}
+                 * only. Check this here.
+                 */
+                if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
+                    tid_data->agg.state != IWL_AGG_OFF,
+                    "Tx while agg.state = %d", tid_data->agg.state))
+                        goto drop_unlock_sta;
+
                 seq_number = tid_data->seq_number;
                 seq_number &= IEEE80211_SCTL_SEQ;
                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);