Bluetooth: don't release the port in rfcomm_dev_state_change()

When the dlc is closed, rfcomm_dev_state_change() tries to release the
port in the case it cannot get a reference to the tty. However this is
racy and not even needed.

Infact as Peter Hurley points out:

1. Only consider dlcs that are 'stolen' from a connected socket, ie.
   reused. Allocated dlcs cannot have been closed prior to port
   activate and so for these dlcs a tty reference will always be avail
   in rfcomm_dev_state_change() -- except for the conditions covered by
   #2b below.
2. If a tty was at some point previously created for this rfcomm, then
   either
   (a) the tty reference is still avail, so rfcomm_dev_state_change()
       will perform a hangup. So nothing to do, or,
   (b) the tty reference is no longer avail, and the tty_port will be
       destroyed by the last tty_port_put() in rfcomm_tty_cleanup.
       Again, no action required.
3. Prior to obtaining the dlc lock in rfcomm_dev_add(),
   rfcomm_dev_state_change() will not 'see' a rfcomm_dev so nothing to
   do here.
4. After releasing the dlc lock in rfcomm_dev_add(),
   rfcomm_dev_state_change() will 'see' an incomplete rfcomm_dev if a
   tty reference could not be obtained. Again, the best thing to do here
   is nothing. Any future attempted open() will block on
   rfcomm_dev_carrier_raised(). The unconnected device will exist until
   released by ioctl(RFCOMMRELEASEDEV).

The patch removes the aforementioned code and uses the
tty_port_tty_hangup() helper to hangup the tty.

Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 6d126fa..84fcf9f 100644 (file)
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -569,7 +569,6 @@ static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
 {
        struct rfcomm_dev *dev = dlc->owner;
-       struct tty_struct *tty;
        if (!dev)
                return;
 
@@ -581,38 +580,8 @@ static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
                            DPM_ORDER_DEV_AFTER_PARENT);
 
                wake_up_interruptible(&dev->port.open_wait);
-       } else if (dlc->state == BT_CLOSED) {
-               tty = tty_port_tty_get(&dev->port);
-               if (!tty) {
-                       if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
-                               /* Drop DLC lock here to avoid deadlock
-                                * 1. rfcomm_dev_get will take rfcomm_dev_lock
-                                *    but in rfcomm_dev_add there's lock order:
-                                *    rfcomm_dev_lock -> dlc lock
-                                * 2. tty_port_put will deadlock if it's
-                                *    the last reference
-                                *
-                                * FIXME: when we release the lock anything
-                                * could happen to dev, even its destruction
-                                */
-                               rfcomm_dlc_unlock(dlc);
-                               if (rfcomm_dev_get(dev->id) == NULL) {
-                                       rfcomm_dlc_lock(dlc);
-                                       return;
-                               }
-
-                               if (!test_and_set_bit(RFCOMM_TTY_RELEASED,
-                                                     &dev->flags))
-                                       tty_port_put(&dev->port);
-
-                               tty_port_put(&dev->port);
-                               rfcomm_dlc_lock(dlc);
-                       }
-               } else {
-                       tty_hangup(tty);
-                       tty_kref_put(tty);
-               }
-       }
+       } else if (dlc->state == BT_CLOSED)
+               tty_port_tty_hangup(&dev->port, false);
 }
 
 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)