Bluetooth: move power_off to system workqueue

hdev->workqueue will be only for for rx/tx/cmd processing, all other small
works should go to the system workqueue for now.
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

net/bluetooth/hci_core.c

@@ -937,7 +937,7 @@ static void hci_power_on(struct work_struct *work)
 		return;
 
 	if (test_bit(HCI_AUTO_OFF, &hdev->flags))
-		queue_delayed_work(hdev->workqueue, &hdev->power_off,
+		schedule_delayed_work(&hdev->power_off,
 					msecs_to_jiffies(AUTO_OFF_TIMEOUT));
 
 	if (test_and_clear_bit(HCI_SETUP, &hdev->flags))

net/bluetooth/mgmt.c

@@ -417,7 +417,7 @@ static int set_powered(struct sock *sk, u16 index, unsigned char *data, u16 len)
 	if (cp->val)
 		queue_work(hdev->workqueue, &hdev->power_on);
 	else
-		queue_work(hdev->workqueue, &hdev->power_off.work);
+		schedule_work(&hdev->power_off.work);
 
 	err = 0;