/*
* RFCOMM TTY.
- *
- * $Id: tty.c,v 1.24 2002/10/03 01:54:38 holtmann Exp $
*/
#include <linux/module.h>
if (dlc->state == BT_CLOSED) {
if (!dev->tty) {
if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
- if (rfcomm_dev_get(dev->id) == NULL)
+ /* 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. rfcomm_dev_put will deadlock if it's
+ * the last reference
+ */
+ rfcomm_dlc_unlock(dlc);
+ if (rfcomm_dev_get(dev->id) == NULL) {
+ rfcomm_dlc_lock(dlc);
return;
+ }
rfcomm_dev_del(dev);
- /* We have to drop DLC lock here, otherwise
- rfcomm_dev_put() will dead lock if it's
- the last reference. */
- rfcomm_dlc_unlock(dlc);
rfcomm_dev_put(dev);
rfcomm_dlc_lock(dlc);
}