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

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