static int virtio_mem_send_unplug_request()

in virtio_mem.c [1391:1424]

• 30 lines of code
• 5 McCabe index (conditional complexity)

static int virtio_mem_send_unplug_request(struct virtio_mem *vm, uint64_t addr,
					  uint64_t size)
{
	const uint64_t nb_vm_blocks = size / vm->device_block_size;
	const struct virtio_mem_req req = {
		.type = cpu_to_virtio16(vm->vdev, VIRTIO_MEM_REQ_UNPLUG),
		.u.unplug.addr = cpu_to_virtio64(vm->vdev, addr),
		.u.unplug.nb_blocks = cpu_to_virtio16(vm->vdev, nb_vm_blocks),
	};
	int rc = -ENOMEM;

	if (atomic_read(&vm->config_changed))
		return -EAGAIN;

	dev_dbg(&vm->vdev->dev, "unplugging memory: 0x%llx - 0x%llx\n", addr,
		addr + size - 1);

	switch (virtio_mem_send_request(vm, &req)) {
	case VIRTIO_MEM_RESP_ACK:
		vm->plugged_size -= size;
		return 0;
	case VIRTIO_MEM_RESP_BUSY:
		rc = -ETXTBSY;
		break;
	case VIRTIO_MEM_RESP_ERROR:
		rc = -EINVAL;
		break;
	default:
		break;
	}

	dev_dbg(&vm->vdev->dev, "unplugging memory failed: %d\n", rc);
	return rc;
}