ath9k_htc: Move endpoint header parsing to TX tasklet

There is no need to do endpoint header removal in the ISR.
Also, this is needed when TX slot management is added later on.
Use a helper function to strip the driver header.
Signed-off-by: NSujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/htc.h

@@ -277,6 +277,7 @@ struct ath9k_htc_tx {
 struct ath9k_htc_tx_ctl {
 	u8 type; /* ATH9K_HTC_* */
 	u8 epid;
+	u8 txok;
 };
 
 static inline struct ath9k_htc_tx_ctl *HTC_SKB_CB(struct sk_buff *skb)

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

@@ -104,6 +104,30 @@ static enum htc_endpoint_id get_htc_epid(struct ath9k_htc_priv *priv,
 	return epid;
 }
 
+static inline int strip_drv_header(struct ath9k_htc_priv *priv,
+				   struct sk_buff *skb)
+{
+	struct ath_common *common = ath9k_hw_common(priv->ah);
+	struct ath9k_htc_tx_ctl *tx_ctl;
+
+	tx_ctl = HTC_SKB_CB(skb);
+
+	if (tx_ctl->epid == priv->mgmt_ep) {
+		skb_pull(skb, sizeof(struct tx_mgmt_hdr));
+	} else if ((tx_ctl->epid == priv->data_bk_ep) ||
+		   (tx_ctl->epid == priv->data_be_ep) ||
+		   (tx_ctl->epid == priv->data_vi_ep) ||
+		   (tx_ctl->epid == priv->data_vo_ep) ||
+		   (tx_ctl->epid == priv->cab_ep)) {
+		skb_pull(skb, sizeof(struct tx_frame_hdr));
+	} else {
+		ath_err(common, "Unsupported EPID: %d\n", tx_ctl->epid);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
 		       struct ath9k_tx_queue_info *qinfo)
 {
@@ -281,22 +305,40 @@ static bool ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
 void ath9k_tx_tasklet(unsigned long data)
 {
 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
+	struct ath9k_htc_tx_ctl *tx_ctl;
 	struct ieee80211_vif *vif;
 	struct ieee80211_sta *sta;
 	struct ieee80211_hdr *hdr;
 	struct ieee80211_tx_info *tx_info;
 	struct sk_buff *skb = NULL;
 	__le16 fc;
+	bool txok;
 
 	while ((skb = skb_dequeue(&priv->tx.tx_queue)) != NULL) {
 
+		if (strip_drv_header(priv, skb) < 0) {
+			dev_kfree_skb_any(skb);
+			continue;
+		}
+
+		tx_ctl = HTC_SKB_CB(skb);
 		hdr = (struct ieee80211_hdr *) skb->data;
 		fc = hdr->frame_control;
 		tx_info = IEEE80211_SKB_CB(skb);
 		vif = tx_info->control.vif;
+		txok = tx_ctl->txok;
 
 		memset(&tx_info->status, 0, sizeof(tx_info->status));
 
+		/*
+		 * URB submission failed for this frame, it never reached
+		 * the target.
+		 */
+		if (!txok)
+			goto send_mac80211;
+
+		tx_info->flags |= IEEE80211_TX_STAT_ACK;
+
 		if (!vif)
 			goto send_mac80211;
 
@@ -350,30 +392,10 @@ void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
 		    enum htc_endpoint_id ep_id, bool txok)
 {
 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv;
-	struct ath_common *common = ath9k_hw_common(priv->ah);
-	struct ieee80211_tx_info *tx_info;
-
-	if (!skb)
-		return;
-
-	if (ep_id == priv->mgmt_ep) {
-		skb_pull(skb, sizeof(struct tx_mgmt_hdr));
-	} else if ((ep_id == priv->data_bk_ep) ||
-		   (ep_id == priv->data_be_ep) ||
-		   (ep_id == priv->data_vi_ep) ||
-		   (ep_id == priv->data_vo_ep) ||
-		   (ep_id == priv->cab_ep)) {
-		skb_pull(skb, sizeof(struct tx_frame_hdr));
-	} else {
-		ath_err(common, "Unsupported TX EPID: %d\n", ep_id);
-		dev_kfree_skb_any(skb);
-		return;
-	}
-
-	tx_info = IEEE80211_SKB_CB(skb);
+	struct ath9k_htc_tx_ctl *tx_ctl;
 
-	if (txok)
-		tx_info->flags |= IEEE80211_TX_STAT_ACK;
+	tx_ctl = HTC_SKB_CB(skb);
+	tx_ctl->txok = txok;
 
 	skb_queue_tail(&priv->tx.tx_queue, skb);
 	tasklet_schedule(&priv->tx_tasklet);