Re: [PATCH 3/4] serial: 8250: Handle case port doesn't have TEMT interrupt using em485.

[Alan Cox]

> +		} else {
> +			while ((lsr & BOTH_EMPTY) != BOTH_EMPTY) {
> +				lsr = serial_in(p, UART_LSR);
> +				cpu_relax();
> +			}
> +		}

This still needs a timeout in case some kind of hardware flow control line
is asserted and therefore the byte is staying put.

Alan