ath9k_htc: Add dropped SKB count to debugfs

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -129,6 +129,7 @@ static void hif_usb_tx_cb(struct urb *urb)
 				TX_STAT_INC(skb_completed);
 			} else {
 				dev_kfree_skb_any(skb);
+				TX_STAT_INC(skb_dropped);
 			}
 		}
 
@@ -149,11 +150,15 @@ static void hif_usb_tx_cb(struct urb *urb)
 	}
 }
 
-static inline void ath9k_skb_queue_purge(struct sk_buff_head *list)
+static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
+					 struct sk_buff_head *list)
 {
 	struct sk_buff *skb;
-	while ((skb = __skb_dequeue(list)) != NULL)
+
+	while ((skb = __skb_dequeue(list)) != NULL) {
 		dev_kfree_skb_any(skb);
+		TX_STAT_INC(skb_dropped);
+	}
 }
 
 /* TX lock has to be taken */
@@ -214,7 +219,7 @@ static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 	ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 	if (ret) {
 		tx_buf->len = tx_buf->offset = 0;
-		ath9k_skb_queue_purge(&tx_buf->skb_queue);
+		ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 		__skb_queue_head_init(&tx_buf->skb_queue);
 		list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 		hif_dev->tx.tx_buf_cnt++;
@@ -281,7 +286,7 @@ static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 	unsigned long flags;
 
 	spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
-	ath9k_skb_queue_purge(&hif_dev->tx.tx_skb_queue);
+	ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 	hif_dev->tx.tx_skb_cnt = 0;
 	hif_dev->tx.flags |= HIF_USB_TX_STOP;
 	spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);

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

@@ -261,6 +261,7 @@ struct ath_tx_stats {
 	u32 buf_completed;
 	u32 skb_queued;
 	u32 skb_completed;
+	u32 skb_dropped;
 };
 
 struct ath_rx_stats {

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

@@ -609,6 +609,9 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
 	len += snprintf(buf + len, sizeof(buf) - len,
 			"%20s : %10u\n", "SKBs completed",
 			priv->debug.tx_stats.skb_completed);
+	len += snprintf(buf + len, sizeof(buf) - len,
+			"%20s : %10u\n", "SKBs dropped",
+			priv->debug.tx_stats.skb_dropped);
 
 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 }