USB: ftdi_sio: use generic chars_in_buffer

Use generic chars_in_buffer rather than copying it's implementation.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 06b5d75..9fe3a2e 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2093,16 +2093,11 @@ static int ftdi_chars_in_buffer(struct tty_struct *tty)
 {
        struct usb_serial_port *port = tty->driver_data;
        struct ftdi_private *priv = usb_get_serial_port_data(port);
-       unsigned long flags;
        int chars;
        unsigned char *buf;
        int ret;
 
-       /* Check software buffer (code from
-        * usb_serial_generic_chars_in_buffer()) */
-       spin_lock_irqsave(&port->lock, flags);
-       chars = kfifo_len(&port->write_fifo) + port->tx_bytes;
-       spin_unlock_irqrestore(&port->lock, flags);
+       chars = usb_serial_generic_chars_in_buffer(tty);
 
        /* Check hardware buffer */
        switch (priv->chip_type) {