Bluetooth: Remove unnecessary hci_dev_unlock for smp_user_confirm_reply

Now that the SMP context has it's own crypto handle it doesn't need to
lock the hci_dev anymore for most operations. This means that it is safe
to call smp_user_confirm_reply with the lock already held.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/mgmt.c

@@ -3052,14 +3052,7 @@ static int user_pairing_resp(struct sock *sk, struct hci_dev *hdev,
 	}
 
 	if (addr->type == BDADDR_LE_PUBLIC || addr->type == BDADDR_LE_RANDOM) {
-		/* Continue with pairing via SMP. The hdev lock must be
-		 * released as SMP may try to recquire it for crypto
-		 * purposes.
-		 */
-		hci_dev_unlock(hdev);
 		err = smp_user_confirm_reply(conn, mgmt_op, passkey);
-		hci_dev_lock(hdev);
-
 		if (!err)
 			err = cmd_complete(sk, hdev->id, mgmt_op,
 					   MGMT_STATUS_SUCCESS, addr,