Dave Young 537d59af73 bluetooth: rfcomm_dev_state_change deadlock fix ... There's logic in __rfcomm_dlc_close: rfcomm_dlc_lock(d); d->state = BT_CLOSED; d->state_changed(d, err); rfcomm_dlc_unlock(d); In rfcomm_dev_state_change, it's possible that rfcomm_dev_put try to take the dlc lock, then we will deadlock. Here fixed it by unlock dlc before rfcomm_dev_get in rfcomm_dev_state_change. why not unlock just before rfcomm_dev_put? it's because there's another problem. rfcomm_dev_get/rfcomm_dev_del will take rfcomm_dev_lock, but in rfcomm_dev_add the lock order is : rfcomm_dev_lock --> dlc lock so I unlock dlc before the taken of rfcomm_dev_lock. Actually it's a regression caused by commit 1905f6c736 ("bluetooth : __rfcomm_dlc_close lock fix"), the dlc state_change could be two callbacks : rfcomm_sk_state_change and rfcomm_dev_state_change. I missed the rfcomm_sk_state_change that time. Thanks Arjan van de Ven <arjan@linux.intel.com> for the effort in commit 4c8411f8c1 ("bluetooth: fix locking bug in the rfcomm socket cleanup handling") but he missed the rfcomm_dev_state_change lock issue. Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2008-06-03 14:27:17 -07:00
..
core.c	bluetooth: fix locking bug in the rfcomm socket cleanup handling	2008-05-29 01:32:47 -07:00
Kconfig	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
Makefile	[Bluetooth] Move CRC table into RFCOMM core	2005-10-28 19:20:36 +02:00
sock.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6	2008-04-02 22:35:23 -07:00
tty.c	bluetooth: rfcomm_dev_state_change deadlock fix	2008-06-03 14:27:17 -07:00