Hello,
Please consider commit e72acc13c770a82b4ce4a07e9716f29320eae0f8
"Bluetooth: Remove unneeded locking" for inclusion into the 3.3.x stable
series.
This patch removes a lock which leads to a deadlock whenever bluetoothd
is stopped while a (battery powered) Bluetooth-HID-device like mouse or
keyboard is connected.
I'm not sure if that only happens with battery powered devices, but the
deadlock appears here every time and can be seen by reading the source
only too:
bluetoothd calls ioctl HCIDEVDOWN
hci_sock_ioctl()
hci_dev_close()
hci_dev_do_close()
hci_dev_lock(hdev);
inquiry_cache_flush();
hci_conn_hash_flush();
hci_conn_del()
cancel_delayed_work_sync()
hci_conn_timeout()
hci_dev_lock(hdev); /* DEADLOCK */
According to the author no prerequisites are necessary
(https://lkml.org/lkml/2012/4/2/218).
I'm using the patch with 3.3.x now since about 2 weeks without any
problems, so I can offer a Tested-by: too.
Regards,
Alexander
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