3 files changed, 8 insertions, 15 deletions

diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index 1bd2845..a764bf9 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -421,7 +421,6 @@ static int max3110_main_thread(void *_max)
 	int ret = 0;
 	struct circ_buf *xmit = &max->con_xmit;
 
-	init_waitqueue_head(wq);
 	pr_info(PR_FMT "start main thread\n");
 
 	do {
@@ -823,7 +822,7 @@ static int __devinit serial_m3110_probe(struct spi_device *spi)
 	res = RC_TAG;
 	ret = max3110_write_then_read(max, (u8 *)&res, (u8 *)&res, 2, 0);
 	if (ret < 0 || res == 0 || res == 0xffff) {
-		printk(KERN_ERR "MAX3111 deemed not present (conf reg %04x)",
+		dev_dbg(&spi->dev, "MAX3111 deemed not present (conf reg %04x)",
 									res);
 		ret = -ENODEV;
 		goto err_get_page;
@@ -838,6 +837,8 @@ static int __devinit serial_m3110_probe(struct spi_device *spi)
 	max->con_xmit.head = 0;
 	max->con_xmit.tail = 0;
 
+	init_waitqueue_head(&max->wq);
+
 	max->main_thread = kthread_run(max3110_main_thread,
 					max, "max3110_main");
 	if (IS_ERR(max->main_thread)) {
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index f2cb750..4652109 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -1397,6 +1397,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 	int fifosize, base_baud;
 	int port_type;
 	struct pch_uart_driver_data *board;
+	const char *board_name;
 
 	board = &drv_dat[id->driver_data];
 	port_type = board->port_type;
@@ -1412,7 +1413,8 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 	base_baud = 1843200; /* 1.8432MHz */
 
 	/* quirk for CM-iTC board */
-	if (strstr(dmi_get_system_info(DMI_BOARD_NAME), "CM-iTC"))
+	board_name = dmi_get_system_info(DMI_BOARD_NAME);
+	if (board_name && strstr(board_name, "CM-iTC"))
 		base_baud = 192000000; /* 192.0MHz */
 
 	switch (port_type) {
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index f1a7918..6c9b7cd 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -413,8 +413,7 @@ static void flush_to_ldisc(struct work_struct *work)
 	spin_lock_irqsave(&tty->buf.lock, flags);
 
 	if (!test_and_set_bit(TTY_FLUSHING, &tty->flags)) {
-		struct tty_buffer *head, *tail = tty->buf.tail;
-		int seen_tail = 0;
+		struct tty_buffer *head;
 		while ((head = tty->buf.head) != NULL) {
 			int count;
 			char *char_buf;
@@ -424,15 +423,6 @@ static void flush_to_ldisc(struct work_struct *work)
 			if (!count) {
 				if (head->next == NULL)
 					break;
-				/*
-				  There's a possibility tty might get new buffer
-				  added during the unlock window below. We could
-				  end up spinning in here forever hogging the CPU
-				  completely. To avoid this let's have a rest each
-				  time we processed the tail buffer.
-				*/
-				if (tail == head)
-					seen_tail = 1;
 				tty->buf.head = head->next;
 				tty_buffer_free(tty, head);
 				continue;
@@ -442,7 +432,7 @@ 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)
+			if (!tty->receive_room)
 				break;
 			if (count > tty->receive_room)
 				count = tty->receive_room;