Power management fixes for v4.14-rc2

- Fix a regression in cpufreq on systems using DT as the source of
    CPU configuration information where two different code paths
    attempt to create the cpufreq-dt device object (there can be only
    one) and fix up the "compatible" matching for some TI platforms
    on top of that (Viresh Kumar, Dave Gerlach).
 
  - Fix an initialization time memory leak in cpuidle on ARM which
    occurs if the cpuidle driver initialization fails (Stefan Wahren).
 
  - Fix a PM core function that checks whether or not there are any
    system suspend/resume callbacks for a device, but forgets to
    check legacy callbacks which then may be skipped incorrectly
    and the system may crash and/or the device may become unusable
    after a suspend-resume cycle (Rafael Wysocki).
 
  - Fix request type validation for latency tolerance PM QoS requests
    which may lead to unexpected behavior (Jan Schönherr).
 
  - Fix a broken link to PM documentation from a header file and a
    typo in a PM document (Geert Uytterhoeven, Rafael Wysocki).
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Merge tag 'pm-4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix a cpufreq regression introduced by recent changes related to
  the generic DT driver, an initialization time memory leak in cpuidle
  on ARM, a PM core bug that may cause system suspend/resume to fail on
  some systems, a request type validation issue in the PM QoS framework
  and two documentation-related issues.

  Specifics:

   - Fix a regression in cpufreq on systems using DT as the source of
     CPU configuration information where two different code paths
     attempt to create the cpufreq-dt device object (there can be only
     one) and fix up the "compatible" matching for some TI platforms on
     top of that (Viresh Kumar, Dave Gerlach).

   - Fix an initialization time memory leak in cpuidle on ARM which
     occurs if the cpuidle driver initialization fails (Stefan Wahren).

   - Fix a PM core function that checks whether or not there are any
     system suspend/resume callbacks for a device, but forgets to check
     legacy callbacks which then may be skipped incorrectly and the
     system may crash and/or the device may become unusable after a
     suspend-resume cycle (Rafael Wysocki).

   - Fix request type validation for latency tolerance PM QoS requests
     which may lead to unexpected behavior (Jan Schönherr).

   - Fix a broken link to PM documentation from a header file and a typo
     in a PM document (Geert Uytterhoeven, Rafael Wysocki)"

* tag 'pm-4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: ti-cpufreq: Support additional am43xx platforms
  ARM: cpuidle: Avoid memleak if init fail
  cpufreq: dt-platdev: Add some missing platforms to the blacklist
  PM: core: Fix device_pm_check_callbacks()
  PM: docs: Drop an excess character from devices.rst
  PM / QoS: Use the correct variable to check the QoS request type
  driver core: Fix link to device power management documentation

Documentation/driver-api/pm/devices.rst

@@ -675,7 +675,7 @@ sub-domain of the parent domain.
 
 Support for power domains is provided through the :c:member:`pm_domain` field of
 |struct device|.  This field is a pointer to an object of type
-|struct dev_pm_domain|, defined in :file:`include/linux/pm.h``, providing a set
+|struct dev_pm_domain|, defined in :file:`include/linux/pm.h`, providing a set
 of power management callbacks analogous to the subsystem-level and device driver
 callbacks that are executed for the given device during all power transitions,
 instead of the respective subsystem-level callbacks.  Specifically, if a

drivers/base/power/main.c

@@ -1860,10 +1860,13 @@ void device_pm_check_callbacks(struct device *dev)
 {
 	spin_lock_irq(&dev->power.lock);
 	dev->power.no_pm_callbacks =
-		(!dev->bus || pm_ops_is_empty(dev->bus->pm)) &&
+		(!dev->bus || (pm_ops_is_empty(dev->bus->pm) &&
-		(!dev->class || pm_ops_is_empty(dev->class->pm)) &&
+		 !dev->bus->suspend && !dev->bus->resume)) &&
+		(!dev->class || (pm_ops_is_empty(dev->class->pm) &&
+		 !dev->class->suspend && !dev->class->resume)) &&
 		(!dev->type || pm_ops_is_empty(dev->type->pm)) &&
 		(!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) &&
-		(!dev->driver || pm_ops_is_empty(dev->driver->pm));
+		(!dev->driver || (pm_ops_is_empty(dev->driver->pm) &&
+		 !dev->driver->suspend && !dev->driver->resume));
 	spin_unlock_irq(&dev->power.lock);
 }

drivers/base/power/qos.c

@@ -277,11 +277,11 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
 	mutex_unlock(&dev_pm_qos_sysfs_mtx);
 }
 
-static bool dev_pm_qos_invalid_request(struct device *dev,
+static bool dev_pm_qos_invalid_req_type(struct device *dev,
-				       struct dev_pm_qos_request *req)
+					enum dev_pm_qos_req_type type)
 {
-	return !req || (req->type == DEV_PM_QOS_LATENCY_TOLERANCE
+	return type == DEV_PM_QOS_LATENCY_TOLERANCE &&
-			&& !dev->power.set_latency_tolerance);
+	       !dev->power.set_latency_tolerance;
 }
 
 static int __dev_pm_qos_add_request(struct device *dev,
@@ -290,7 +290,7 @@ static int __dev_pm_qos_add_request(struct device *dev,
 {
 	int ret = 0;
 
-	if (!dev || dev_pm_qos_invalid_request(dev, req))
+	if (!dev || !req || dev_pm_qos_invalid_req_type(dev, type))
 		return -EINVAL;
 
 	if (WARN(dev_pm_qos_request_active(req),

drivers/cpufreq/cpufreq-dt-platdev.c

@@ -106,6 +106,18 @@ static const struct of_device_id whitelist[] __initconst = {
  * platforms using "operating-points-v2" property.
  */
 static const struct of_device_id blacklist[] __initconst = {
+	{ .compatible = "calxeda,highbank", },
+	{ .compatible = "calxeda,ecx-2000", },
+
+	{ .compatible = "marvell,armadaxp", },
+
+	{ .compatible = "nvidia,tegra124", },
+
+	{ .compatible = "st,stih407", },
+	{ .compatible = "st,stih410", },
+
+	{ .compatible = "sigma,tango4", },
+
 	{ }
 };
 

drivers/cpufreq/ti-cpufreq.c

@@ -190,7 +190,7 @@ static int ti_cpufreq_setup_syscon_register(struct ti_cpufreq_data *opp_data)
 
 static const struct of_device_id ti_cpufreq_of_match[] = {
 	{ .compatible = "ti,am33xx", .data = &am3x_soc_data, },
-	{ .compatible = "ti,am4372", .data = &am4x_soc_data, },
+	{ .compatible = "ti,am43", .data = &am4x_soc_data, },
 	{ .compatible = "ti,dra7", .data = &dra7_soc_data },
 	{},
 };

drivers/cpuidle/cpuidle-arm.c

@@ -104,13 +104,13 @@ static int __init arm_idle_init(void)
 		ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);
 		if (ret <= 0) {
 			ret = ret ? : -ENODEV;
-			goto out_fail;
+			goto init_fail;
 		}
 
 		ret = cpuidle_register_driver(drv);
 		if (ret) {
 			pr_err("Failed to register cpuidle driver\n");
-			goto out_fail;
+			goto init_fail;
 		}
 
 		/*
@@ -149,6 +149,8 @@ static int __init arm_idle_init(void)
 	}
 
 	return 0;
+init_fail:
+	kfree(drv);
 out_fail:
 	while (--cpu >= 0) {
 		dev = per_cpu(cpuidle_devices, cpu);

include/linux/device.h

@@ -838,7 +838,7 @@ struct dev_links_info {
  * @driver_data: Private pointer for driver specific info.
  * @links:	Links to suppliers and consumers of this device.
  * @power:	For device power management.
- * 		See Documentation/power/admin-guide/devices.rst for details.
+ *		See Documentation/driver-api/pm/devices.rst for details.
  * @pm_domain:	Provide callbacks that are executed during system suspend,
  * 		hibernation, system resume and during runtime PM transitions
  * 		along with subsystem-level and driver-level callbacks.