ath5k: Count how many times a queue got stuck

Add a counter to show how many times a queue got stuck in the debugfs queue
file.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath5k/base.c

@@ -892,6 +892,7 @@ ath5k_txq_setup(struct ath5k_softc *sc,
 		txq->setup = true;
 		txq->txq_len = 0;
 		txq->txq_poll_mark = false;
+		txq->txq_stuck = 0;
 	}
 	return &sc->txqs[qnum];
 }
@@ -2193,6 +2194,7 @@ ath5k_tx_complete_poll_work(struct work_struct *work)
 						  "TX queue stuck %d\n",
 						  txq->qnum);
 					needreset = true;
+					txq->txq_stuck++;
 					spin_unlock_bh(&txq->lock);
 					break;
 				} else {

drivers/net/wireless/ath/ath5k/base.h

@@ -88,6 +88,7 @@ struct ath5k_txq {
 	bool			setup;
 	int			txq_len; /* number of queued buffers */
 	bool			txq_poll_mark;
+	unsigned int		txq_stuck;	/* informational counter */
 };
 
 #define ATH5K_LED_MAX_NAME_LEN 31

drivers/net/wireless/ath/ath5k/debug.c

@@ -785,6 +785,8 @@ static ssize_t read_file_queue(struct file *file, char __user *user_buf,
 
 		len += snprintf(buf+len, sizeof(buf)-len,
 				"  len: %d bufs: %d\n", txq->txq_len, n);
+		len += snprintf(buf+len, sizeof(buf)-len,
+				"  stuck: %d\n", txq->txq_stuck);
 	}
 
 	if (len > sizeof(buf))