next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type)
{
	struct usb_gadgetfs_event	*event;
	unsigned			i;

	switch (type) {
	/* these events purge the queue */
	case GADGETFS_DISCONNECT:
		if (dev->state == STATE_DEV_SETUP)
			dev->setup_abort = 1;
		fallthrough;
	case GADGETFS_CONNECT:
		dev->ev_next = 0;
		break;
	case GADGETFS_SETUP:		/* previous request timed out */
	case GADGETFS_SUSPEND:		/* same effect */
		/* these events can't be repeated */
		for (i = 0; i != dev->ev_next; i++) {
			if (dev->event [i].type != type)
				continue;
			DBG(dev, "discard old event[%d] %d\n", i, type);
			dev->ev_next--;
			if (i == dev->ev_next)
				break;
			/* indices start at zero, for simplicity */
			memmove (&dev->event [i], &dev->event [i + 1],
				sizeof (struct usb_gadgetfs_event)
					* (dev->ev_next - i));
		}
		break;
	default:
		BUG ();
	}
	VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type);
	event = &dev->event [dev->ev_next++];
	BUG_ON (dev->ev_next > N_EVENT);
	memset (event, 0, sizeof *event);
	event->type = type;
	return event;
}
Unknown