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Commit b6e557fb authored by Marcel Holtmann's avatar Marcel Holtmann Committed by David S. Miller
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[Bluetooth] More checks if DLC is still attached to the TTY 



If the DLC device is no longer attached to the TTY device, then return
errors or default values for various callbacks of the TTY layer.

Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent f4777569

net/bluetooth/rfcomm/tty.c

+15 −7
Original line number Diff line number Diff line
@@ -697,9 +697,13 @@ static int rfcomm_tty_write_room(struct tty_struct *tty) 


	BT_DBG("tty %p", tty);



	if (!dev || !dev->dlc)

		return 0;



	room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);

	if (room < 0)

		room = 0;



	return room;

}
@@ -915,12 +919,14 @@ 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 +934,12 @@ 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 +959,12 @@ 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))