diff options
Diffstat (limited to 'drivers/usb/serial/sierra.c')
| -rw-r--r-- | drivers/usb/serial/sierra.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c index 37480348e39b..ed43b18ace78 100644 --- a/drivers/usb/serial/sierra.c +++ b/drivers/usb/serial/sierra.c @@ -675,6 +675,23 @@ static int sierra_write_room(struct tty_struct *tty) return 2048; } +static int sierra_chars_in_buffer(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct sierra_port_private *portdata = usb_get_serial_port_data(port); + unsigned long flags; + int chars; + + /* NOTE: This overcounts somewhat. */ + spin_lock_irqsave(&portdata->lock, flags); + chars = portdata->outstanding_urbs * MAX_TRANSFER; + spin_unlock_irqrestore(&portdata->lock, flags); + + dev_dbg(&port->dev, "%s - %d\n", __func__, chars); + + return chars; +} + static void sierra_stop_rx_urbs(struct usb_serial_port *port) { int i; @@ -1060,6 +1077,7 @@ static struct usb_serial_driver sierra_device = { .dtr_rts = sierra_dtr_rts, .write = sierra_write, .write_room = sierra_write_room, + .chars_in_buffer = sierra_chars_in_buffer, .set_termios = sierra_set_termios, .tiocmget = sierra_tiocmget, .tiocmset = sierra_tiocmset, |