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Commit 6a597a38 authored by Peter Hurley's avatar Peter Hurley Committed by Greg Kroah-Hartman
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serial: 8250: Remove low_latency workaround 



The defunct low_latency input steering executed flush_to_ldisc()
directly from interrupt context so dropping the port lock was
necessary to avoid deadlock. That steering was removed by

    commit a9c3f68f
    Author: Peter Hurley <peter@hurleysoftware.com>
    Date:   Sat Feb 22 07:31:21 2014 -0500

    tty: Fix low_latency BUG

Signed-off-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d22f8f10

drivers/tty/serial/8250/8250_port.c

+1 −2
Original line number Diff line number Diff line
@@ -1489,9 +1489,8 @@ unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr) 
			break;

		lsr = serial_in(up, UART_LSR);

	} while (lsr & (UART_LSR_DR | UART_LSR_BI));

	spin_unlock(&port->lock);



	tty_flip_buffer_push(&port->state->port);

	spin_lock(&port->lock);

	return lsr;

}

EXPORT_SYMBOL_GPL(serial8250_rx_chars);