USB: keyspan termios tidy

- Clear unsupported CMSPAR bit
- Clean up long chains of a->b-> a bit
- Encode baud rate back into tty structure properly
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/keyspan.c

@@ -278,29 +278,35 @@ static void keyspan_set_termios (struct usb_serial_port *port,
 	struct keyspan_port_private 	*p_priv;
 	const struct keyspan_device_details	*d_details;
 	unsigned int 			cflag;
+	struct tty_struct		*tty = port->tty;
 
 	dbg("%s", __FUNCTION__); 
 
 	p_priv = usb_get_serial_port_data(port);
 	d_details = p_priv->device_details;
-	cflag = port->tty->termios->c_cflag;
+	cflag = tty->termios->c_cflag;
 	device_port = port->number - port->serial->minor;
 
 	/* Baud rate calculation takes baud rate as an integer
 	   so other rates can be generated if desired. */
-	baud_rate = tty_get_baud_rate(port->tty);
+	baud_rate = tty_get_baud_rate(tty);
 	/* If no match or invalid, don't change */		
-	if (baud_rate >= 0
-	    && d_details->calculate_baud_rate(baud_rate, d_details->baudclk,
+	if (d_details->calculate_baud_rate(baud_rate, d_details->baudclk,
 				NULL, NULL, NULL, device_port) == KEYSPAN_BAUD_RATE_OK) {
 		/* FIXME - more to do here to ensure rate changes cleanly */
+		/* FIXME - calcuate exact rate from divisor ? */
 		p_priv->baud = baud_rate;
-	}
+	} else
+		baud_rate = tty_termios_baud_rate(old_termios);
 
+	tty_encode_baud_rate(tty, baud_rate, baud_rate);
 	/* set CTS/RTS handshake etc. */
 	p_priv->cflag = cflag;
 	p_priv->flow_control = (cflag & CRTSCTS)? flow_cts: flow_none;
 
+	/* Mark/Space not supported */
+	tty->termios->c_cflag &= ~CMSPAR;
+
 	keyspan_send_setup(port, 0);
 }