static long nd_ioctl()

in bus.c [1221:1265]

• 37 lines of code
• 8 McCabe index (conditional complexity)

static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
		enum nd_ioctl_mode mode)

{
	struct nvdimm_bus *nvdimm_bus, *found = NULL;
	long id = (long) file->private_data;
	struct nvdimm *nvdimm = NULL;
	int rc, ro;

	ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
	mutex_lock(&nvdimm_bus_list_mutex);
	list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
		if (mode == DIMM_IOCTL) {
			struct device *dev;

			dev = device_find_child(&nvdimm_bus->dev,
					file->private_data, match_dimm);
			if (!dev)
				continue;
			nvdimm = to_nvdimm(dev);
			found = nvdimm_bus;
		} else if (nvdimm_bus->id == id) {
			found = nvdimm_bus;
		}

		if (found) {
			atomic_inc(&nvdimm_bus->ioctl_active);
			break;
		}
	}
	mutex_unlock(&nvdimm_bus_list_mutex);

	if (!found)
		return -ENXIO;

	nvdimm_bus = found;
	rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);

	if (nvdimm)
		put_device(&nvdimm->dev);
	if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))
		wake_up(&nvdimm_bus->wait);

	return rc;
}