ath9k: validate the TID in the tx status information

Occasionally the hardware can send out tx status information with the wrong
TID. In that case, the BA status cannot be trusted and the aggregate
must be retransmitted.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 05ec36ac55f5..bd52ac111795 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -355,6 +355,14 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
         an = (struct ath_node *)sta->drv_priv;
         tid = ATH_AN_2_TID(an, bf->bf_tidno);
 
+        /*
+         * The hardware occasionally sends a tx status for the wrong TID.
+         * In this case, the BA status cannot be considered valid and all
+         * subframes need to be retransmitted
+         */
+        if (bf->bf_tidno != ts->tid)
+                txok = false;
+
         isaggr = bf_isaggr(bf);
         memset(ba, 0, WME_BA_BMP_SIZE >> 3);