4 files changed, 19 insertions, 27 deletions

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 428f4fe0b5f7..0ad32888091c 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -95,6 +95,7 @@ static void n_tty_set_room(struct tty_struct *tty)
 {
 	/* tty->read_cnt is not read locked ? */
 	int	left = N_TTY_BUF_SIZE - tty->read_cnt - 1;
+	int old_left;
 
 	/*
 	 * If we are doing input canonicalization, and there are no
@@ -104,7 +105,12 @@ static void n_tty_set_room(struct tty_struct *tty)
 	 */
 	if (left <= 0)
 		left = tty->icanon && !tty->canon_data;
+	old_left = tty->receive_room;
 	tty->receive_room = left;
+
+	/* Did this open up the receive buffer? We may need to flip */
+	if (left && !old_left)
+		schedule_work(&tty->buf.work);
 }
 
 static void put_tty_queue_nolock(unsigned char c, struct tty_struct *tty)
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index e1aee37270f5..80484af781e1 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1506,7 +1506,7 @@ config SERIAL_BCM63XX_CONSOLE
 
 config SERIAL_GRLIB_GAISLER_APBUART
 	tristate "GRLIB APBUART serial support"
-	depends on OF
+	depends on OF && SPARC
 	select SERIAL_CORE
 	---help---
 	Add support for the GRLIB APBUART serial port.
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index 1ab999b04ef3..19a943693e4c 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -555,10 +555,9 @@ static struct uart_driver grlib_apbuart_driver = {
 
 static int __devinit apbuart_probe(struct platform_device *op)
 {
-	int i = -1;
+	int i;
 	struct uart_port *port = NULL;
 
-	i = 0;
 	for (i = 0; i < grlib_apbuart_port_nr; i++) {
 		if (op->dev.of_node == grlib_apbuart_nodes[i])
 			break;
@@ -566,6 +565,7 @@ static int __devinit apbuart_probe(struct platform_device *op)
 
 	port = &grlib_apbuart_ports[i];
 	port->dev = &op->dev;
+	port->irq = op->archdata.irqs[0];
 
 	uart_add_one_port(&grlib_apbuart_driver, (struct uart_port *) port);
 
@@ -598,24 +598,12 @@ static struct platform_driver grlib_apbuart_of_driver = {
 
 static int grlib_apbuart_configure(void)
 {
-	struct device_node *np, *rp;
-	const u32 *prop;
-	int freq_khz, line = 0;
-
-	/* Get bus frequency */
-	rp = of_find_node_by_path("/");
-	if (!rp)
-		return -ENODEV;
-	rp = of_get_next_child(rp, NULL);
-	if (!rp)
-		return -ENODEV;
-	prop = of_get_property(rp, "clock-frequency", NULL);
-	if (!prop)
-		return -ENODEV;
-	freq_khz = *prop;
+	struct device_node *np;
+	int line = 0;
 
 	for_each_matching_node(np, apbuart_match) {
-		const int *irqs, *ampopts;
+		const int *ampopts;
+		const u32 *freq_hz;
 		const struct amba_prom_registers *regs;
 		struct uart_port *port;
 		unsigned long addr;
@@ -623,11 +611,11 @@ static int grlib_apbuart_configure(void)
 		ampopts = of_get_property(np, "ampopts", NULL);
 		if (ampopts && (*ampopts == 0))
 			continue; /* Ignore if used by another OS instance */
-
-		irqs = of_get_property(np, "interrupts", NULL);
 		regs = of_get_property(np, "reg", NULL);
+		/* Frequency of APB Bus is frequency of UART */
+		freq_hz = of_get_property(np, "freq", NULL);
 
-		if (!irqs || !regs)
+		if (!regs || !freq_hz || (*freq_hz == 0))
 			continue;
 
 		grlib_apbuart_nodes[line] = np;
@@ -638,12 +626,12 @@ static int grlib_apbuart_configure(void)
 
 		port->mapbase = addr;
 		port->membase = ioremap(addr, sizeof(struct grlib_apbuart_regs_map));
-		port->irq = *irqs;
+		port->irq = 0;
 		port->iotype = UPIO_MEM;
 		port->ops = &grlib_apbuart_ops;
 		port->flags = UPF_BOOT_AUTOCONF;
 		port->line = line;
-		port->uartclk = freq_khz * 1000;
+		port->uartclk = *freq_hz;
 		port->fifosize = apbuart_scan_fifo_size((struct uart_port *) port, line);
 		line++;
 
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index b9451219528b..f1a7918d71aa 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -442,10 +442,8 @@ static void flush_to_ldisc(struct work_struct *work)
 			   line discipline as we want to empty the queue */
 			if (test_bit(TTY_FLUSHPENDING, &tty->flags))
 				break;
-			if (!tty->receive_room || seen_tail) {
-				schedule_work(&tty->buf.work);
+			if (!tty->receive_room || seen_tail)
 				break;
-			}
 			if (count > tty->receive_room)
 				count = tty->receive_room;
 			char_buf = head->char_buf_ptr + head->read;