diff options
| -rw-r--r-- | net/bluetooth/rfcomm/tty.c | 27 |
1 files changed, 6 insertions, 21 deletions
diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c index cd7ff370be38..9c0e142041bd 100644 --- a/net/bluetooth/rfcomm/tty.c +++ b/net/bluetooth/rfcomm/tty.c @@ -76,13 +76,6 @@ static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig); /* ---- Device functions ---- */ -/* - * The reason this isn't actually a race, as you no doubt have a little voice - * screaming at you in your head, is that the refcount should never actually - * reach zero unless the device has already been taken off the list, in - * rfcomm_dev_del(). And if that's not true, we'll hit the BUG() in - * rfcomm_dev_destruct() anyway. - */ static void rfcomm_dev_destruct(struct tty_port *port) { struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); @@ -90,10 +83,9 @@ static void rfcomm_dev_destruct(struct tty_port *port) BT_DBG("dev %p dlc %p", dev, dlc); - /* Refcount should only hit zero when called from rfcomm_dev_del() - which will have taken us off the list. Everything else are - refcounting bugs. */ - BUG_ON(!list_empty(&dev->list)); + spin_lock(&rfcomm_dev_lock); + list_del(&dev->list); + spin_unlock(&rfcomm_dev_lock); rfcomm_dlc_lock(dlc); /* Detach DLC if it's owned by this dev */ @@ -282,7 +274,9 @@ out: dev->id, NULL); if (IS_ERR(dev->tty_dev)) { err = PTR_ERR(dev->tty_dev); + spin_lock(&rfcomm_dev_lock); list_del(&dev->list); + spin_unlock(&rfcomm_dev_lock); goto free; } @@ -315,10 +309,6 @@ static void rfcomm_dev_del(struct rfcomm_dev *dev) } spin_unlock_irqrestore(&dev->port.lock, flags); - spin_lock(&rfcomm_dev_lock); - list_del_init(&dev->list); - spin_unlock(&rfcomm_dev_lock); - tty_port_put(&dev->port); } @@ -750,13 +740,8 @@ static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp) dev->port.tty = NULL; rfcomm_dlc_unlock(dev->dlc); - if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) { - spin_lock(&rfcomm_dev_lock); - list_del_init(&dev->list); - spin_unlock(&rfcomm_dev_lock); - + if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) tty_port_put(&dev->port); - } } else spin_unlock_irqrestore(&dev->port.lock, flags); |