1 files changed, 28 insertions, 20 deletions

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index d3340dd52bcf..d030c69cb5a3 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -39,11 +39,6 @@
 #include <net/bluetooth/hci_core.h>
 #include <net/bluetooth/rfcomm.h>
 
-#ifndef CONFIG_BT_RFCOMM_DEBUG
-#undef  BT_DBG
-#define BT_DBG(D...)
-#endif
-
 #define RFCOMM_TTY_MAGIC 0x6d02         /* magic number for rfcomm struct */
 #define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
 #define RFCOMM_TTY_MAJOR 216            /* device node major id of the usb/bluetooth.c driver */
@@ -58,7 +53,7 @@ struct rfcomm_dev {
         char                    name[12];
         int                     id;
         unsigned long           flags;
-        int                     opened;
+        atomic_t                opened;
         int                     err;
 
         bdaddr_t                src;
@@ -261,6 +256,8 @@ static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
         dev->flags = req->flags &
                 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
 
+        atomic_set(&dev->opened, 0);
+
         init_waitqueue_head(&dev->wait);
         tasklet_init(&dev->wakeup_task, rfcomm_tty_wakeup, (unsigned long) dev);
 
@@ -301,18 +298,15 @@ static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
 out:
         write_unlock_bh(&rfcomm_dev_lock);
 
-        if (err < 0) {
-                kfree(dev);
-                return err;
-        }
+        if (err < 0)
+                goto free;
 
         dev->tty_dev = tty_register_device(rfcomm_tty_driver, dev->id, NULL);
 
         if (IS_ERR(dev->tty_dev)) {
                 err = PTR_ERR(dev->tty_dev);
                 list_del(&dev->list);
-                kfree(dev);
-                return err;
+                goto free;
         }
 
         dev_set_drvdata(dev->tty_dev, dev);
@@ -324,16 +318,20 @@ out:
                 BT_ERR("Failed to create channel attribute");
 
         return dev->id;
+
+free:
+        kfree(dev);
+        return err;
 }
 
 static void rfcomm_dev_del(struct rfcomm_dev *dev)
 {
         BT_DBG("dev %p", dev);
 
-        if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
-                BUG_ON(1);
-        else
-                set_bit(RFCOMM_TTY_RELEASED, &dev->flags);
+        BUG_ON(test_and_set_bit(RFCOMM_TTY_RELEASED, &dev->flags));
+
+        if (atomic_read(&dev->opened) > 0)
+                return;
 
         write_lock_bh(&rfcomm_dev_lock);
         list_del_init(&dev->list);
@@ -689,9 +687,10 @@ static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
         if (!dev)
                 return -ENODEV;
 
-        BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst), dev->channel, dev->opened);
+        BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst),
+                                dev->channel, atomic_read(&dev->opened));
 
-        if (dev->opened++ != 0)
+        if (atomic_inc_return(&dev->opened) > 1)
                 return 0;
 
         dlc = dev->dlc;
@@ -747,9 +746,10 @@ static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
         if (!dev)
                 return;
 
-        BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->opened);
+        BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc,
+                                                atomic_read(&dev->opened));
 
-        if (--dev->opened == 0) {
+        if (atomic_dec_and_test(&dev->opened)) {
                 if (dev->tty_dev->parent)
                         device_move(dev->tty_dev, NULL);
 
@@ -763,6 +763,14 @@ static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
                 tty->driver_data = NULL;
                 dev->tty = NULL;
                 rfcomm_dlc_unlock(dev->dlc);
+
+                if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) {
+                        write_lock_bh(&rfcomm_dev_lock);
+                        list_del_init(&dev->list);
+                        write_unlock_bh(&rfcomm_dev_lock);
+
+                        rfcomm_dev_put(dev);
+                }
         }
 
         rfcomm_dev_put(dev);