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The XR21V141X does not have a 5- or 6-bit mode, but the current
implementation failed to properly restore the old setting when CS5 or
CS6 was requested. Instead an invalid request would be sent to the
device.
Fixes: c2d405aa86 ("USB: serial: add MaxLinear/Exar USB to Serial driver")
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Cc: stable@vger.kernel.org # 5.12
Signed-off-by: Johan Hovold <johan@kernel.org>