TTY: move low_latency to tty_port

One point is to have less places where we actually need tty pointer.
The other is that low_latency is bound to buffer processing and
buffers are now in tty_port. So it makes sense to move low_latency to
tty_port too.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index f8ae5d8..942022a 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -436,7 +436,7 @@
 	struct tty_port *port = &info->port;
 
 	tty->driver_data = info;
-	tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+	port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 
 	/*
 	 * figure out which console to use (should be one already)
diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c
index 54ef40c..ae61bd6 100644
--- a/arch/mn10300/kernel/mn10300-serial.c
+++ b/arch/mn10300/kernel/mn10300-serial.c
@@ -537,7 +537,7 @@
 	count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE);
 	count = tty_buffer_request_room(port, count);
 	if (count == 0) {
-		if (!tty->low_latency)
+		if (!port->low_latency)
 			tty_flip_buffer_push(tty);
 		return;
 	}
@@ -546,7 +546,7 @@
 	/* pull chars out of the hat */
 	ix = ACCESS_ONCE(port->rx_outp);
 	if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) {
-		if (push && !tty->low_latency)
+		if (push && !port->low_latency)
 			tty_flip_buffer_push(tty);
 		return;
 	}
@@ -678,7 +678,7 @@
 
 	count--;
 	if (count <= 0) {
-		if (!tty->low_latency)
+		if (!port->low_latency)
 			tty_flip_buffer_push(tty);
 		return;
 	}