--EILSEQ (*, **) a) CRC mismatch
- b) no response packet received within the
- prescribed bus turn-around time
- c) unknown USB error
-
- Note that often the controller hardware does not
- distinguish among cases a), b), and c), so a
- driver cannot tell whether there was a protocol
- error, a failure to respond (often caused by
- device disconnect), or some other fault.
-
--ETIMEDOUT (**) No response packet received within the prescribed
- bus turn-around time. This error may instead be
- reported as -EPROTO or -EILSEQ.
-
- Note that the synchronous USB message functions
- also use this code to indicate timeout expired
- before the transfer completed.