static int devfreq_passive_notifier_call()

in governor_passive.c [102:132]

• 27 lines of code
• 6 McCabe index (conditional complexity)

static int devfreq_passive_notifier_call(struct notifier_block *nb,
				unsigned long event, void *ptr)
{
	struct devfreq_passive_data *data
			= container_of(nb, struct devfreq_passive_data, nb);
	struct devfreq *devfreq = (struct devfreq *)data->this;
	struct devfreq *parent = (struct devfreq *)data->parent;
	struct devfreq_freqs *freqs = (struct devfreq_freqs *)ptr;
	unsigned long freq = freqs->new;
	int ret = 0;

	mutex_lock_nested(&devfreq->lock, SINGLE_DEPTH_NESTING);
	switch (event) {
	case DEVFREQ_PRECHANGE:
		if (parent->previous_freq > freq)
			ret = devfreq_update_target(devfreq, freq);

		break;
	case DEVFREQ_POSTCHANGE:
		if (parent->previous_freq < freq)
			ret = devfreq_update_target(devfreq, freq);
		break;
	}
	mutex_unlock(&devfreq->lock);

	if (ret < 0)
		dev_warn(&devfreq->dev,
			"failed to update devfreq using passive governor\n");

	return NOTIFY_DONE;
}