tty: serial: 8250_core.c Bug fix for Exar chips.

commit b790f210fe8423eff881b2a8a93ba5dbc45534d0 upstream.

The sleep function was updated to put the serial port to sleep only when necessary.
This appears to resolve the errant behavior of the driver as described in
Kernel Bug 61961 – "My Exar Corp. XR17C/D152 Dual PCI UART modem does not
work with 3.8.0".

Signed-off-by: Michael Welling <mwelling@ieee.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 4f6e01cf67f7eaa2393d5ef7bb7613ee8e2ff52f..aa6db8f4ee187f5320bf0c1d32bf5d71596334f3 100644 (file)
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -555,7 +555,7 @@ static void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
         */
        if ((p->port.type == PORT_XR17V35X) ||
           (p->port.type == PORT_XR17D15X)) {
-               serial_out(p, UART_EXAR_SLEEP, 0xff);
+               serial_out(p, UART_EXAR_SLEEP, sleep ? 0xff : 0);
                return;
        }