[PATCH] Altix: shut off xmit intr if done xmitting

Small mod to shut off the xmit interrupt if we have nothing to transmit.
Signed-off-by: NPatrick Gefre <pfg@sgi.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/serial/sn_console.c

@@ -572,6 +572,7 @@ static void sn_transmit_chars(struct sn_cons_port *port, int raw)
 
 	if (uart_circ_empty(xmit) || uart_tx_stopped(&port->sc_port)) {
 		/* Nothing to do. */
+		ia64_sn_console_intr_disable(SAL_CONSOLE_INTR_XMIT);
 		return;
 	}