Merge branch 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm

Pull operating performance points (OPP) framework updates for v5.14
from Viresh Kumar:

"This pull request:

- allows partial use of required-opps for non-genpd users.

- does a minor cleanup and uses list_del_init()."

* 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
  opp: Allow required-opps to be used for non genpd use cases
  opp: use list_del_init instead of list_del/INIT_LIST_HEAD

Author: rafaeljw

drivers/opp/core.c

@@ -893,6 +893,16 @@ static int _set_required_opps(struct device *dev,
 	if (!required_opp_tables)
 		return 0;
 
+	/*
+	 * We only support genpd's OPPs in the "required-opps" for now, as we
+	 * don't know much about other use cases. Error out if the required OPP
+	 * doesn't belong to a genpd.
+	 */
+	if (unlikely(!required_opp_tables[0]->is_genpd)) {
+		dev_err(dev, "required-opps don't belong to a genpd\n");
+		return -ENOENT;
+	}
+
 	/* required-opps not fully initialized yet */
 	if (lazy_linking_pending(opp_table))
 		return -EBUSY;

drivers/opp/of.c

@@ -197,21 +197,8 @@ static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
 		required_opp_tables[i] = _find_table_of_opp_np(required_np);
 		of_node_put(required_np);
 
-		if (IS_ERR(required_opp_tables[i])) {
+		if (IS_ERR(required_opp_tables[i]))
 			lazy = true;
-			continue;
-		}
-
-		/*
-		 * We only support genpd's OPPs in the "required-opps" for now,
-		 * as we don't know how much about other cases. Error out if the
-		 * required OPP doesn't belong to a genpd.
-		 */
-		if (!required_opp_tables[i]->is_genpd) {
-			dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n",
-				required_np);
-			goto free_required_tables;
-		}
 	}
 
 	/* Let's do the linking later on */
@@ -379,13 +366,6 @@ static void lazy_link_required_opp_table(struct opp_table *new_table)
 	struct dev_pm_opp *opp;
 	int i, ret;
 
-	/*
-	 * We only support genpd's OPPs in the "required-opps" for now,
-	 * as we don't know much about other cases.
-	 */
-	if (!new_table->is_genpd)
-		return;
-
 	mutex_lock(&opp_table_lock);
 
 	list_for_each_entry_safe(opp_table, temp, &lazy_opp_tables, lazy) {
@@ -433,8 +413,7 @@ static void lazy_link_required_opp_table(struct opp_table *new_table)
 
 		/* All required opp-tables found, remove from lazy list */
 		if (!lazy) {
-			list_del(&opp_table->lazy);
-			INIT_LIST_HEAD(&opp_table->lazy);
+			list_del_init(&opp_table->lazy);
 
 			list_for_each_entry(opp, &opp_table->opp_list, node)
 				_required_opps_available(opp, opp_table->required_opp_count);
@@ -874,7 +853,7 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
 		return ERR_PTR(-ENOMEM);
 
 	ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available);
-	if (ret < 0 && !opp_table->is_genpd) {
+	if (ret < 0) {
 		dev_err(dev, "%s: opp key field not found\n", __func__);
 		goto free_opp;
 	}