USB: serial: Note mos7480 and option don't lock modem status

Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/mos7840.c

@@ -1722,6 +1722,7 @@ static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
 	if (mos7840_port == NULL)
 		return -ENODEV;
 
+	/* FIXME: What locks the port registers ? */
 	mcr = mos7840_port->shadowMCR;
 	if (clear & TIOCM_RTS)
 		mcr &= ~MCR_RTS;

drivers/usb/serial/option.c

@@ -458,6 +458,7 @@ static int option_tiocmset(struct usb_serial_port *port, struct file *file,
 
 	portdata = usb_get_serial_port_data(port);
 
+	/* FIXME: what locks portdata fields ? */
 	if (set & TIOCM_RTS)
 		portdata->rts_state = 1;
 	if (set & TIOCM_DTR)