Function resource_list_release

freebsd/kern/subr_bus.c:3481–3521

* @brief Helper function for implementing BUS_RELEASE_RESOURCE() * * Implement BUS_RELEASE_RESOURCE() using a resource list. Normally * used with resource_list_alloc(). * * @param rl the resource list which was allocated from * @param bus the parent device of @p child * @param child the device which is requesting a release * @param type the type of resource to release * @param rid th

 *			error condition prevented the operation
 */
int
resource_list_release(struct resource_list *rl, device_t bus, device_t child,
    int type, int rid, struct resource *res)
{
	struct resource_list_entry *rle = NULL;
	int passthrough = (device_get_parent(child) != bus);
	int error;

	if (passthrough) {
		return (BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
		    type, rid, res));
	}

	rle = resource_list_find(rl, type, rid);

	if (!rle)
		panic("resource_list_release: can't find resource");
	if (!rle->res)
		panic("resource_list_release: resource entry is not busy");
	if (rle->flags & RLE_RESERVED) {
		if (rle->flags & RLE_ALLOCATED) {
			if (rman_get_flags(res) & RF_ACTIVE) {
				error = bus_deactivate_resource(child, type,
				    rid, res);
				if (error)
					return (error);
			}
			rle->flags &= ~RLE_ALLOCATED;
			return (0);
		}
		return (EINVAL);
	}

	error = BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
	    type, rid, res);
	if (error)
		return (error);

	rle->res = NULL;
	return (0);
}

/**
 * @brief Release all active resources of a given type