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()

10 files changed, 68 insertions, 30 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 92ed9692c47..4bf68c8d479 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -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
diff --git a/drivers/acpi/acpi_i2c.c b/drivers/acpi/acpi_i2c.c
index 82045e3f5ca..a82c7626aa9 100644
--- a/drivers/acpi/acpi_i2c.c
+++ b/drivers/acpi/acpi_i2c.c
@@ -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;
 
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index fc95308e9a1..ee255c60bda 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -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)
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index 5f74587ef25..71671c42ef4 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -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))
@@ -591,26 +609,27 @@ 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);
-	}
 }
 
 /**
@@ -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;
 }
@@ -676,10 +706,8 @@ 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);
-	}
 }
 
 /**
@@ -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);
diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
index 4e5b7fb8927..37d23a0f8c5 100644
--- a/drivers/cpufreq/cpufreq-cpu0.c
+++ b/drivers/cpufreq/cpufreq-cpu0.c
@@ -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;
 	}
diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
index 46bde01eee6..cc4bd2f6838 100644
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -14,8 +14,8 @@
  * published by the Free Software Foundation.
  */
 
-#ifndef _CPUFREQ_GOVERNER_H
-#define _CPUFREQ_GOVERNER_H
+#ifndef _CPUFREQ_GOVERNOR_H
+#define _CPUFREQ_GOVERNOR_H
 
 #include <linux/cpufreq.h>
 #include <linux/kobject.h>
@@ -175,4 +175,4 @@ bool need_load_eval(struct cpu_dbs_common_info *cdbs,
 		unsigned int sampling_rate);
 int cpufreq_governor_dbs(struct dbs_data *dbs_data,
 		struct cpufreq_policy *policy, unsigned int event);
-#endif /* _CPUFREQ_GOVERNER_H */
+#endif /* _CPUFREQ_GOVERNOR_H */
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 0ceb6e1b0f6..e3085c487ac 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -182,7 +182,6 @@ static int dw_i2c_probe(struct platform_device *pdev)
 	adap->algo = &i2c_dw_algo;
 	adap->dev.parent = &pdev->dev;
 	adap->dev.of_node = pdev->dev.of_node;
-	ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev));
 
 	r = i2c_add_numbered_adapter(adap);
 	if (r) {
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 90b27a3508a..810413883c7 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1168,7 +1168,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 
 	master->dev.parent = &pdev->dev;
 	master->dev.of_node = pdev->dev.of_node;
-	ACPI_HANDLE_SET(&master->dev, ACPI_HANDLE(&pdev->dev));
 	/* the spi->mode bits understood by this driver: */
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
 
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index f996c600eb8..5e073d897ed 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -984,7 +984,7 @@ static void acpi_register_spi_devices(struct spi_master *master)
 	acpi_status status;
 	acpi_handle handle;
 
-	handle = ACPI_HANDLE(&master->dev);
+	handle = ACPI_HANDLE(master->dev.parent);
 	if (!handle)
 		return;
 
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 797f9d51473..65d4e55552c 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -67,7 +67,6 @@ static void usb_port_device_release(struct device *dev)
 {
 	struct usb_port *port_dev = to_usb_port(dev);
 
-	dev_pm_qos_hide_flags(dev);
 	kfree(port_dev);
 }