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>

1 files changed, 1 insertions, 6 deletions

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 06b5d75dffc6..9fe3a2e965ad 100644
--- 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) {