ath9k_htc: adhere to the DONT_REORDER transmit flag

Assure that frames with the fixed order flag are not reordered
relative to each other. This is accomplished by transmitting them
using a fixed priority independent of their QoS field.
Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@kuleuven.be>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201104061823.197407-6-Mathy.Vanhoef@kuleuven.be

drivers/net/wireless/ath/ath9k/htc_drv_txrx.c

@@ -297,7 +297,12 @@ static void ath9k_htc_tx_data(struct ath9k_htc_priv *priv,
 		tx_hdr.data_type = ATH9K_HTC_NORMAL;
 	}
 
-	if (ieee80211_is_data_qos(hdr->frame_control)) {
+	/* Transmit all frames that should not be reordered relative
+	 * to each other using the same priority. For other QoS data
+	 * frames extract the priority from the header.
+	 */
+	if (!(tx_info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) &&
+	    ieee80211_is_data_qos(hdr->frame_control)) {
 		qc = ieee80211_get_qos_ctl(hdr);
 		tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 	}