static int keyspan_pda_chars_in_buffer (struct usb_serial_port *port){	struct keyspan_pda_private *priv;		priv = usb_get_serial_port_data(port);		/* when throttled, return at least WAKEUP_CHARS to tell select() (via	   n_tty.c:normal_poll() ) that we're not writeable. */	if( port->write_urb->status == -EINPROGRESS || priv->tx_throttled )		return 256;	return 0;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/507ca9bc0476662f3463888d583864834eab1e11/keyspan_pda.c/buggy/drivers/usb/serial/keyspan_pda.c