Merge tag 'pm-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix an operating performance point (OPP) reference counting
  issue and three issues in ARM cpufreq drivers.

  Specifics:

   - Add a flag to mark OPPs that are not referenced by he OPP core any
     more to prevent OPPs from being freed prematurely by mistake (Beata
     Michalska).

   - Add ARM Vexpress platforms to the cpufreq-dt-platdev blacklist
     since the actual scaling of them is handled elsewhere (Sudeep
     Holla).

   - Fix a function return value check and a possible use-after-free in
     the qcom-hw cpufreq driver (Shawn Guo, Wei Yongjun)"

* tag 'pm-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  opp: Don't drop extra references to OPPs accidentally
  cpufreq: blacklist Arm Vexpress platforms in cpufreq-dt-platdev
  cpufreq: qcom-hw: Fix return value check in qcom_cpufreq_hw_cpu_init()
  cpufreq: qcom-hw: fix dereferencing freed memory 'data'

drivers/cpufreq/cpufreq-dt-platdev.c

@@ -103,6 +103,8 @@ static const struct of_device_id whitelist[] __initconst = {
 static const struct of_device_id blacklist[] __initconst = {
 	{ .compatible = "allwinner,sun50i-h6", },
 
+	{ .compatible = "arm,vexpress", },
+
 	{ .compatible = "calxeda,highbank", },
 	{ .compatible = "calxeda,ecx-2000", },
 

drivers/cpufreq/qcom-cpufreq-hw.c

@@ -317,9 +317,9 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 	}
 
 	base = ioremap(res->start, resource_size(res));
-	if (IS_ERR(base)) {
+	if (!base) {
 		dev_err(dev, "failed to map resource %pR\n", res);
-		ret = PTR_ERR(base);
+		ret = -ENOMEM;
 		goto release_region;
 	}
 
@@ -374,7 +374,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 error:
 	kfree(data);
 unmap_base:
-	iounmap(data->base);
+	iounmap(base);
 release_region:
 	release_mem_region(res->start, resource_size(res));
 	return ret;

drivers/opp/core.c

@@ -1492,7 +1492,11 @@ static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table,
 
 	mutex_lock(&opp_table->lock);
 	list_for_each_entry(temp, &opp_table->opp_list, node) {
-		if (dynamic == temp->dynamic) {
+		/*
+		 * Refcount must be dropped only once for each OPP by OPP core,
+		 * do that with help of "removed" flag.
+		 */
+		if (!temp->removed && dynamic == temp->dynamic) {
 			opp = temp;
 			break;
 		}
@@ -1502,10 +1506,27 @@ static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table,
 	return opp;
 }
 
-bool _opp_remove_all_static(struct opp_table *opp_table)
+/*
+ * Can't call dev_pm_opp_put() from under the lock as debugfs removal needs to
+ * happen lock less to avoid circular dependency issues. This routine must be
+ * called without the opp_table->lock held.
+ */
+static void _opp_remove_all(struct opp_table *opp_table, bool dynamic)
 {
 	struct dev_pm_opp *opp;
 
+	while ((opp = _opp_get_next(opp_table, dynamic))) {
+		opp->removed = true;
+		dev_pm_opp_put(opp);
+
+		/* Drop the references taken by dev_pm_opp_add() */
+		if (dynamic)
+			dev_pm_opp_put_opp_table(opp_table);
+	}
+}
+
+bool _opp_remove_all_static(struct opp_table *opp_table)
+{
 	mutex_lock(&opp_table->lock);
 
 	if (!opp_table->parsed_static_opps) {
@@ -1520,13 +1541,7 @@ bool _opp_remove_all_static(struct opp_table *opp_table)
 
 	mutex_unlock(&opp_table->lock);
 
-	/*
-	 * Can't remove the OPP from under the lock, debugfs removal needs to
-	 * happen lock less to avoid circular dependency issues.
-	 */
-	while ((opp = _opp_get_next(opp_table, false)))
-		dev_pm_opp_put(opp);
-
+	_opp_remove_all(opp_table, false);
 	return true;
 }
 
@@ -1539,25 +1554,12 @@ bool _opp_remove_all_static(struct opp_table *opp_table)
 void dev_pm_opp_remove_all_dynamic(struct device *dev)
 {
 	struct opp_table *opp_table;
-	struct dev_pm_opp *opp;
-	int count = 0;
 
 	opp_table = _find_opp_table(dev);
 	if (IS_ERR(opp_table))
 		return;
 
-	/*
-	 * Can't remove the OPP from under the lock, debugfs removal needs to
-	 * happen lock less to avoid circular dependency issues.
-	 */
-	while ((opp = _opp_get_next(opp_table, true))) {
-		dev_pm_opp_put(opp);
-		count++;
-	}
-
-	/* Drop the references taken by dev_pm_opp_add() */
-	while (count--)
-		dev_pm_opp_put_opp_table(opp_table);
+	_opp_remove_all(opp_table, true);
 
 	/* Drop the reference taken by _find_opp_table() */
 	dev_pm_opp_put_opp_table(opp_table);

drivers/opp/opp.h

@@ -56,6 +56,7 @@ extern struct list_head opp_tables, lazy_opp_tables;
  * @dynamic:	not-created from static DT entries.
  * @turbo:	true if turbo (boost) OPP
  * @suspend:	true if suspend OPP
+ * @removed:	flag indicating that OPP's reference is dropped by OPP core.
  * @pstate: Device's power domain's performance state.
  * @rate:	Frequency in hertz
  * @level:	Performance level
@@ -78,6 +79,7 @@ struct dev_pm_opp {
 	bool dynamic;
 	bool turbo;
 	bool suspend;
+	bool removed;
 	unsigned int pstate;
 	unsigned long rate;
 	unsigned int level;