int dev_pm_opp_xlate_performance_state()

in core.c [2542:2591]

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

int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
				       struct opp_table *dst_table,
				       unsigned int pstate)
{
	struct dev_pm_opp *opp;
	int dest_pstate = -EINVAL;
	int i;

	/*
	 * Normally the src_table will have the "required_opps" property set to
	 * point to one of the OPPs in the dst_table, but in some cases the
	 * genpd and its master have one to one mapping of performance states
	 * and so none of them have the "required-opps" property set. Return the
	 * pstate of the src_table as it is in such cases.
	 */
	if (!src_table || !src_table->required_opp_count)
		return pstate;

	/* required-opps not fully initialized yet */
	if (lazy_linking_pending(src_table))
		return -EBUSY;

	for (i = 0; i < src_table->required_opp_count; i++) {
		if (src_table->required_opp_tables[i]->np == dst_table->np)
			break;
	}

	if (unlikely(i == src_table->required_opp_count)) {
		pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
		       __func__, src_table, dst_table);
		return -EINVAL;
	}

	mutex_lock(&src_table->lock);

	list_for_each_entry(opp, &src_table->opp_list, node) {
		if (opp->pstate == pstate) {
			dest_pstate = opp->required_opps[i]->pstate;
			goto unlock;
		}
	}

	pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
	       dst_table);

unlock:
	mutex_unlock(&src_table->lock);

	return dest_pstate;
}