Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Merge net into net-next because some upcoming net-next changes
build on top of bug fixes that went into net.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 9 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index cf75beb1251b..4753c005cfb6 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -359,20 +359,29 @@ static int serial_chars_in_buffer(struct tty_struct *tty)
 {
 	struct usb_serial_port *port = tty->driver_data;
 	struct usb_serial *serial = port->serial;
-	int count = 0;
 
 	dev_dbg(tty->dev, "%s\n", __func__);
 
-	mutex_lock(&serial->disc_mutex);
-	/* if the device was unplugged then any remaining characters
-	   fell out of the connector ;) */
 	if (serial->disconnected)
-		count = 0;
-	else
-		count = serial->type->chars_in_buffer(tty);
-	mutex_unlock(&serial->disc_mutex);
+		return 0;
+
+	return serial->type->chars_in_buffer(tty);
+}
+
+static void serial_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct usb_serial *serial = port->serial;
+
+	dev_dbg(tty->dev, "%s\n", __func__);
+
+	if (!port->serial->type->wait_until_sent)
+		return;
 
-	return count;
+	mutex_lock(&serial->disc_mutex);
+	if (!serial->disconnected)
+		port->serial->type->wait_until_sent(tty, timeout);
+	mutex_unlock(&serial->disc_mutex);
 }
 
 static void serial_throttle(struct tty_struct *tty)
@@ -1191,6 +1200,7 @@ static const struct tty_operations serial_ops = {
 	.unthrottle =		serial_unthrottle,
 	.break_ctl =		serial_break,
 	.chars_in_buffer =	serial_chars_in_buffer,
+	.wait_until_sent =	serial_wait_until_sent,
 	.tiocmget =		serial_tiocmget,
 	.tiocmset =		serial_tiocmset,
 	.get_icount =		serial_get_icount,
@@ -1316,6 +1326,8 @@ static void usb_serial_operations_init(struct usb_serial_driver *device)
 	set_to_generic_if_null(device, close);
 	set_to_generic_if_null(device, write_room);
 	set_to_generic_if_null(device, chars_in_buffer);
+	if (device->tx_empty)
+		set_to_generic_if_null(device, wait_until_sent);
 	set_to_generic_if_null(device, read_bulk_callback);
 	set_to_generic_if_null(device, write_bulk_callback);
 	set_to_generic_if_null(device, process_read_urb);