[Bluetooth] Make use of device_move() for RFCOMM TTY devices

In the case of bound RFCOMM TTY devices the parent is not available
before its usage. So when opening a RFCOMM TTY device, move it to
the corresponding ACL device as a child. When closing the device,
move it back to the virtual device tree.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 8cd82dce5008..9a7a44fc721f 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -74,6 +74,8 @@ struct rfcomm_dev {
         wait_queue_head_t       wait;
         struct tasklet_struct   wakeup_task;
 
+        struct device           *tty_dev;
+
         atomic_t                wmem_alloc;
 };
 
@@ -261,7 +263,7 @@ out:
                 return err;
         }
 
-        tty_register_device(rfcomm_tty_driver, dev->id, rfcomm_get_device(dev));
+        dev->tty_dev = tty_register_device(rfcomm_tty_driver, dev->id, NULL);
 
         return dev->id;
 }
@@ -630,6 +632,9 @@ static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
         set_current_state(TASK_RUNNING);
         remove_wait_queue(&dev->wait, &wait);
 
+        if (err == 0)
+                device_move(dev->tty_dev, rfcomm_get_device(dev));
+
         return err;
 }
 
@@ -642,6 +647,8 @@ static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
         BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->opened);
 
         if (--dev->opened == 0) {
+                device_move(dev->tty_dev, NULL);
+
                 /* Close DLC and dettach TTY */
                 rfcomm_dlc_close(dev->dlc, 0);