diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 1fb5d42..0a6afc2 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -280,6 +280,9 @@ static void rfcomm_dev_del(struct rfcomm_dev *dev)
 /* ---- Send buffer ---- */
 static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc)
 {
+	if (!dlc)
+		return 0;
+
 	/* We can't let it be zero, because we don't get a callback
 	   when tx_credits becomes nonzero, hence we'd never wake up */
 	return dlc->mtu * (dlc->tx_credits?:1);
@@ -915,12 +918,14 @@ static void rfcomm_tty_unthrottle(struct tty_struct *tty)
 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
 {
 	struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
-	struct rfcomm_dlc *dlc = dev->dlc;
 
 	BT_DBG("tty %p dev %p", tty, dev);
 
-	if (!skb_queue_empty(&dlc->tx_queue))
-		return dlc->mtu;
+	if (!dev || !dev->dlc)
+		return 0;
+
+	if (!skb_queue_empty(&dev->dlc->tx_queue))
+		return dev->dlc->mtu;
 
 	return 0;
 }
@@ -928,11 +933,12 @@ static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
 {
 	struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
-	if (!dev)
-		return;
 
 	BT_DBG("tty %p dev %p", tty, dev);
 
+	if (!dev || !dev->dlc)
+		return;
+
 	skb_queue_purge(&dev->dlc->tx_queue);
 
 	if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
@@ -952,11 +958,12 @@ static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 static void rfcomm_tty_hangup(struct tty_struct *tty)
 {
 	struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
-	if (!dev)
-		return;
 
 	BT_DBG("tty %p dev %p", tty, dev);
 
+	if (!dev)
+		return;
+
 	rfcomm_tty_flush_buffer(tty);
 
 	if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags))