Commit d08d528d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'pm+acpi-3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 

Pull ACPI and power management fixes from Rafael Wysocki:

 - Revert of a recent cpuidle change that caused Nehalem machines to
   hang on boot from Alex Shi.

 - USB power management fix addressing a crash in the port device
   object's release routine from Rafael J Wysocki.

 - Device PM QoS fix for a potential deadlock related to sysfs interface
   from Rafael J Wysocki.

 - Fix for a cpufreq crash when the /cpus Device Tree node is missing
   from Paolo Pisati.

 - Fix for a build issue on ia64 related to the Boot Graphics Resource
   Table (BGRT) from Tony Luck.

 - Two fixes for ACPI handles being set incorrectly for device objects
   that don't correspond to any ACPI namespace nodes in the I2C and SPI
   subsystems from Rafael J Wysocki.

 - Fix for compiler warnings related to CONFIG_PM_DEVFREQ being unset
   from Rajagopal Venkat.

 - Fix for a symbol definition typo in cpufreq_governor.h from Borislav
   Petkov.

* tag 'pm+acpi-3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / BGRT: Don't let users configure BGRT on non X86 systems
  cpuidle / ACPI: recover percpu ACPI processor cstate
  ACPI / I2C: Use parent's ACPI_HANDLE() in acpi_i2c_register_devices()
  cpufreq: Correct header guards typo
  ACPI / SPI: Use parent's ACPI_HANDLE() in acpi_register_spi_devices()
  cpufreq: check OF node /cpus presence before dereferencing it
  PM / devfreq: Fix compiler warnings for CONFIG_PM_DEVFREQ unset
  PM / QoS: Avoid possible deadlock related to sysfs access
  USB / PM: Don't try to hide PM QoS flags from usb_port_device_release()
parents b6a9b7f6 6cb437ac

drivers/acpi/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -396,7 +396,7 @@ config ACPI_CUSTOM_METHOD 


config ACPI_BGRT

	bool "Boottime Graphics Resource Table support"

	depends on EFI

	depends on EFI && X86

        help

	  This driver adds support for exposing the ACPI Boottime Graphics

	  Resource Table, which allows the operating system to obtain

drivers/acpi/acpi_i2c.c

+1 −1
Original line number Diff line number Diff line
@@ -90,7 +90,7 @@ void acpi_i2c_register_devices(struct i2c_adapter *adapter) 
	acpi_handle handle;

	acpi_status status;



	handle = ACPI_HANDLE(&adapter->dev);

	handle = ACPI_HANDLE(adapter->dev.parent);

	if (!handle)

		return;

drivers/acpi/processor_idle.c

+7 −6
Original line number Diff line number Diff line
@@ -66,7 +66,8 @@ module_param(latency_factor, uint, 0644); 


static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device);



static struct acpi_processor_cx *acpi_cstate[CPUIDLE_STATE_MAX];

static DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX],

								acpi_cstate);



static int disabled_by_idle_boot_param(void)

{
@@ -722,7 +723,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, 
		struct cpuidle_driver *drv, int index)

{

	struct acpi_processor *pr;

	struct acpi_processor_cx *cx = acpi_cstate[index];

	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);



	pr = __this_cpu_read(processors);
@@ -745,7 +746,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, 
 */

static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)

{

	struct acpi_processor_cx *cx = acpi_cstate[index];

	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);



	ACPI_FLUSH_CPU_CACHE();
@@ -775,7 +776,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev, 
		struct cpuidle_driver *drv, int index)

{

	struct acpi_processor *pr;

	struct acpi_processor_cx *cx = acpi_cstate[index];

	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);



	pr = __this_cpu_read(processors);
@@ -833,7 +834,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, 
		struct cpuidle_driver *drv, int index)

{

	struct acpi_processor *pr;

	struct acpi_processor_cx *cx = acpi_cstate[index];

	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);



	pr = __this_cpu_read(processors);
@@ -960,7 +961,7 @@ static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr, 
		    !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))

			continue;

#endif

		acpi_cstate[count] = cx;

		per_cpu(acpi_cstate[count], dev->cpu) = cx;



		count++;

		if (count == CPUIDLE_STATE_MAX)

drivers/base/power/qos.c

+47 −13
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ 
#include "power.h"



static DEFINE_MUTEX(dev_pm_qos_mtx);

static DEFINE_MUTEX(dev_pm_qos_sysfs_mtx);



static BLOCKING_NOTIFIER_HEAD(dev_pm_notifiers);
@@ -216,12 +217,17 @@ void dev_pm_qos_constraints_destroy(struct device *dev) 
	struct pm_qos_constraints *c;

	struct pm_qos_flags *f;



	mutex_lock(&dev_pm_qos_mtx);

	mutex_lock(&dev_pm_qos_sysfs_mtx);



	/*

	 * If the device's PM QoS resume latency limit or PM QoS flags have been

	 * exposed to user space, they have to be hidden at this point.

	 */

	pm_qos_sysfs_remove_latency(dev);

	pm_qos_sysfs_remove_flags(dev);



	mutex_lock(&dev_pm_qos_mtx);



	__dev_pm_qos_hide_latency_limit(dev);

	__dev_pm_qos_hide_flags(dev);
@@ -254,6 +260,8 @@ void dev_pm_qos_constraints_destroy(struct device *dev) 


 out:

	mutex_unlock(&dev_pm_qos_mtx);



	mutex_unlock(&dev_pm_qos_sysfs_mtx);

}



/**
@@ -558,6 +566,14 @@ static void __dev_pm_qos_drop_user_request(struct device *dev, 
	kfree(req);

}



static void dev_pm_qos_drop_user_request(struct device *dev,

					 enum dev_pm_qos_req_type type)

{

	mutex_lock(&dev_pm_qos_mtx);

	__dev_pm_qos_drop_user_request(dev, type);

	mutex_unlock(&dev_pm_qos_mtx);

}



/**

 * dev_pm_qos_expose_latency_limit - Expose PM QoS latency limit to user space.

 * @dev: Device whose PM QoS latency limit is to be exposed to user space.
@@ -581,6 +597,8 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) 
		return ret;

	}



	mutex_lock(&dev_pm_qos_sysfs_mtx);



	mutex_lock(&dev_pm_qos_mtx);



	if (IS_ERR_OR_NULL(dev->power.qos))
@@ -591,27 +609,28 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) 
	if (ret < 0) {

		__dev_pm_qos_remove_request(req);

		kfree(req);

		mutex_unlock(&dev_pm_qos_mtx);

		goto out;

	}



	dev->power.qos->latency_req = req;



	mutex_unlock(&dev_pm_qos_mtx);



	ret = pm_qos_sysfs_add_latency(dev);

	if (ret)

		__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);

		dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);



 out:

	mutex_unlock(&dev_pm_qos_mtx);

	mutex_unlock(&dev_pm_qos_sysfs_mtx);

	return ret;

}

EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit);



static void __dev_pm_qos_hide_latency_limit(struct device *dev)

{

	if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->latency_req) {

		pm_qos_sysfs_remove_latency(dev);

	if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->latency_req)

		__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);

}

}



/**

 * dev_pm_qos_hide_latency_limit - Hide PM QoS latency limit from user space.
@@ -619,9 +638,15 @@ static void __dev_pm_qos_hide_latency_limit(struct device *dev) 
 */

void dev_pm_qos_hide_latency_limit(struct device *dev)

{

	mutex_lock(&dev_pm_qos_sysfs_mtx);



	pm_qos_sysfs_remove_latency(dev);



	mutex_lock(&dev_pm_qos_mtx);

	__dev_pm_qos_hide_latency_limit(dev);

	mutex_unlock(&dev_pm_qos_mtx);



	mutex_unlock(&dev_pm_qos_sysfs_mtx);

}

EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_limit);
@@ -649,6 +674,8 @@ int dev_pm_qos_expose_flags(struct device *dev, s32 val) 
	}



	pm_runtime_get_sync(dev);

	mutex_lock(&dev_pm_qos_sysfs_mtx);



	mutex_lock(&dev_pm_qos_mtx);



	if (IS_ERR_OR_NULL(dev->power.qos))
@@ -659,16 +686,19 @@ int dev_pm_qos_expose_flags(struct device *dev, s32 val) 
	if (ret < 0) {

		__dev_pm_qos_remove_request(req);

		kfree(req);

		mutex_unlock(&dev_pm_qos_mtx);

		goto out;

	}



	dev->power.qos->flags_req = req;



	mutex_unlock(&dev_pm_qos_mtx);



	ret = pm_qos_sysfs_add_flags(dev);

	if (ret)

		__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);

		dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);



 out:

	mutex_unlock(&dev_pm_qos_mtx);

	mutex_unlock(&dev_pm_qos_sysfs_mtx);

	pm_runtime_put(dev);

	return ret;

}
@@ -676,11 +706,9 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_expose_flags); 


static void __dev_pm_qos_hide_flags(struct device *dev)

{

	if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->flags_req) {

		pm_qos_sysfs_remove_flags(dev);

	if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->flags_req)

		__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);

}

}



/**

 * dev_pm_qos_hide_flags - Hide PM QoS flags of a device from user space.
@@ -689,9 +717,15 @@ static void __dev_pm_qos_hide_flags(struct device *dev) 
void dev_pm_qos_hide_flags(struct device *dev)

{

	pm_runtime_get_sync(dev);

	mutex_lock(&dev_pm_qos_sysfs_mtx);



	pm_qos_sysfs_remove_flags(dev);



	mutex_lock(&dev_pm_qos_mtx);

	__dev_pm_qos_hide_flags(dev);

	mutex_unlock(&dev_pm_qos_mtx);



	mutex_unlock(&dev_pm_qos_sysfs_mtx);

	pm_runtime_put(dev);

}

EXPORT_SYMBOL_GPL(dev_pm_qos_hide_flags);

drivers/cpufreq/cpufreq-cpu0.c

+8 −2
Original line number Diff line number Diff line
@@ -178,10 +178,16 @@ static struct cpufreq_driver cpu0_cpufreq_driver = { 


static int cpu0_cpufreq_probe(struct platform_device *pdev)

{

	struct device_node *np;

	struct device_node *np, *parent;

	int ret;



	for_each_child_of_node(of_find_node_by_path("/cpus"), np) {

	parent = of_find_node_by_path("/cpus");

	if (!parent) {

		pr_err("failed to find OF /cpus\n");

		return -ENOENT;

	}



	for_each_child_of_node(parent, np) {

		if (of_get_property(np, "operating-points", NULL))

			break;

	}

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