int devfreq_add_governor()

in devfreq.c [1243:1301]

• 50 lines of code
• 7 McCabe index (conditional complexity)

int devfreq_add_governor(struct devfreq_governor *governor)
{
	struct devfreq_governor *g;
	struct devfreq *devfreq;
	int err = 0;

	if (!governor) {
		pr_err("%s: Invalid parameters.\n", __func__);
		return -EINVAL;
	}

	mutex_lock(&devfreq_list_lock);
	g = find_devfreq_governor(governor->name);
	if (!IS_ERR(g)) {
		pr_err("%s: governor %s already registered\n", __func__,
		       g->name);
		err = -EINVAL;
		goto err_out;
	}

	list_add(&governor->node, &devfreq_governor_list);

	list_for_each_entry(devfreq, &devfreq_list, node) {
		int ret = 0;
		struct device *dev = devfreq->dev.parent;

		if (!strncmp(devfreq->governor->name, governor->name,
			     DEVFREQ_NAME_LEN)) {
			/* The following should never occur */
			if (devfreq->governor) {
				dev_warn(dev,
					 "%s: Governor %s already present\n",
					 __func__, devfreq->governor->name);
				ret = devfreq->governor->event_handler(devfreq,
							DEVFREQ_GOV_STOP, NULL);
				if (ret) {
					dev_warn(dev,
						 "%s: Governor %s stop = %d\n",
						 __func__,
						 devfreq->governor->name, ret);
				}
				/* Fall through */
			}
			devfreq->governor = governor;
			ret = devfreq->governor->event_handler(devfreq,
						DEVFREQ_GOV_START, NULL);
			if (ret) {
				dev_warn(dev, "%s: Governor %s start=%d\n",
					 __func__, devfreq->governor->name,
					 ret);
			}
		}
	}

err_out:
	mutex_unlock(&devfreq_list_lock);

	return err;
}