struct ib_uverbs_device *dev = container_of(class_dev, struct ib_uverbs_device, class_dev);
struct ib_uverbs_device *dev = class_get_devdata(class_dev);  if (!dev) return -ENODEV;
static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf){	struct ib_uverbs_device *dev =		container_of(class_dev, struct ib_uverbs_device, class_dev);	return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);}