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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 a9c3f68f3c
    Author: Peter Hurley <peter@hurleysoftware.com>
    Date:   Sat Feb 22 07:31:21 2014 -0500

    tty: Fix low_latency BUG

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-01-10 14:39:33 -08:00 committed by Greg Kroah-Hartman
parent d22f8f1068
commit 6a597a38cb
1 changed files with 1 additions and 2 deletions
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3
drivers/tty/serial/8250/8250_port.c
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@ -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);