Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6:
  PM: PM QOS update fix
  Freezer / cgroup freezer: Update stale locking comments
  PM / platform_bus: Allow runtime PM by default
  i2c: Fix bus-level power management callbacks
  PM QOS update
  PM / Hibernate: Fix block_io.c printk warning
  PM / Hibernate: Group swap ops
  PM / Hibernate: Move the first_sector out of swsusp_write
  PM / Hibernate: Separate block_io
  PM / Hibernate: Snapshot cleanup
  FS / libfs: Implement simple_write_to_buffer
  PM / Hibernate: document open(/dev/snapshot) side effects
  PM / Runtime: Add sysfs debug files
  PM: Improve device power management document
  PM: Update device power management document
  PM: Allow runtime_suspend methods to call pm_schedule_suspend()
  PM: pm_wakeup - switch to using bool

10 files changed, 192 insertions, 100 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 5939e7f7d8e..c3817e1f32c 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -698,7 +698,7 @@ static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
 		   "max_cstate:              C%d\n"
 		   "maximum allowed latency: %d usec\n",
 		   pr->power.state ? pr->power.state - pr->power.states : 0,
-		   max_cstate, pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY));
+		   max_cstate, pm_qos_request(PM_QOS_CPU_DMA_LATENCY));
 
 	seq_puts(seq, "states:\n");
 
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 765bcf0df3b..ada6397c23a 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -967,17 +967,17 @@ static int platform_pm_restore_noirq(struct device *dev)
 
 int __weak platform_pm_runtime_suspend(struct device *dev)
 {
-	return -ENOSYS;
+	return pm_generic_runtime_suspend(dev);
 };
 
 int __weak platform_pm_runtime_resume(struct device *dev)
 {
-	return -ENOSYS;
+	return pm_generic_runtime_resume(dev);
 };
 
 int __weak platform_pm_runtime_idle(struct device *dev)
 {
-	return -ENOSYS;
+	return pm_generic_runtime_idle(dev);
 };
 
 #else /* !CONFIG_PM_RUNTIME */
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 626dd147b75..b0ec0e9f27e 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -229,14 +229,16 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq)
 
 	if (retval) {
 		dev->power.runtime_status = RPM_ACTIVE;
-		pm_runtime_cancel_pending(dev);
-
 		if (retval == -EAGAIN || retval == -EBUSY) {
-			notify = true;
+			if (dev->power.timer_expires == 0)
+				notify = true;
 			dev->power.runtime_error = 0;
+		} else {
+			pm_runtime_cancel_pending(dev);
 		}
 	} else {
 		dev->power.runtime_status = RPM_SUSPENDED;
+		pm_runtime_deactivate_timer(dev);
 
 		if (dev->parent) {
 			parent = dev->parent;
@@ -659,8 +661,6 @@ int pm_schedule_suspend(struct device *dev, unsigned int delay)
 
 	if (dev->power.runtime_status == RPM_SUSPENDED)
 		retval = 1;
-	else if (dev->power.runtime_status == RPM_SUSPENDING)
-		retval = -EINPROGRESS;
 	else if (atomic_read(&dev->power.usage_count) > 0
 	    || dev->power.disable_depth > 0)
 		retval = -EAGAIN;
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 86fd9373447..a4c33bc5125 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -5,6 +5,7 @@
 #include <linux/device.h>
 #include <linux/string.h>
 #include <linux/pm_runtime.h>
+#include <asm/atomic.h>
 #include "power.h"
 
 /*
@@ -143,7 +144,59 @@ wake_store(struct device * dev, struct device_attribute *attr,
 
 static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
 
-#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG
+#ifdef CONFIG_PM_ADVANCED_DEBUG
+#ifdef CONFIG_PM_RUNTIME
+
+static ssize_t rtpm_usagecount_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
+}
+
+static ssize_t rtpm_children_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", dev->power.ignore_children ?
+		0 : atomic_read(&dev->power.child_count));
+}
+
+static ssize_t rtpm_enabled_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
+		return sprintf(buf, "disabled & forbidden\n");
+	else if (dev->power.disable_depth)
+		return sprintf(buf, "disabled\n");
+	else if (dev->power.runtime_auto == false)
+		return sprintf(buf, "forbidden\n");
+	return sprintf(buf, "enabled\n");
+}
+
+static ssize_t rtpm_status_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	if (dev->power.runtime_error)
+		return sprintf(buf, "error\n");
+	switch (dev->power.runtime_status) {
+	case RPM_SUSPENDED:
+		return sprintf(buf, "suspended\n");
+	case RPM_SUSPENDING:
+		return sprintf(buf, "suspending\n");
+	case RPM_RESUMING:
+		return sprintf(buf, "resuming\n");
+	case RPM_ACTIVE:
+		return sprintf(buf, "active\n");
+	}
+	return -EIO;
+}
+
+static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
+static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
+static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
+static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
+
+#endif
+
 static ssize_t async_show(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
@@ -170,15 +223,21 @@ static ssize_t async_store(struct device *dev, struct device_attribute *attr,
 }
 
 static DEVICE_ATTR(async, 0644, async_show, async_store);
-#endif /* CONFIG_PM_SLEEP_ADVANCED_DEBUG */
+#endif /* CONFIG_PM_ADVANCED_DEBUG */
 
 static struct attribute * power_attrs[] = {
 #ifdef CONFIG_PM_RUNTIME
 	&dev_attr_control.attr,
 #endif
 	&dev_attr_wakeup.attr,
-#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG
+#ifdef CONFIG_PM_ADVANCED_DEBUG
 	&dev_attr_async.attr,
+#ifdef CONFIG_PM_RUNTIME
+	&dev_attr_runtime_usage.attr,
+	&dev_attr_runtime_active_kids.attr,
+	&dev_attr_runtime_status.attr,
+	&dev_attr_runtime_enabled.attr,
+#endif
 #endif
 	NULL,
 };
diff --git a/drivers/cpuidle/governors/ladder.c b/drivers/cpuidle/governors/ladder.c
index 1c1ceb4f218..12c98900dcf 100644
--- a/drivers/cpuidle/governors/ladder.c
+++ b/drivers/cpuidle/governors/ladder.c
@@ -67,7 +67,7 @@ static int ladder_select_state(struct cpuidle_device *dev)
 	struct ladder_device *ldev = &__get_cpu_var(ladder_devices);
 	struct ladder_device_state *last_state;
 	int last_residency, last_idx = ldev->last_state_idx;
-	int latency_req = pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY);
+	int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
 
 	/* Special case when user has set very strict latency requirement */
 	if (unlikely(latency_req == 0)) {
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index f8e57c6303f..b81ad9c731a 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -182,7 +182,7 @@ static u64 div_round64(u64 dividend, u32 divisor)
 static int menu_select(struct cpuidle_device *dev)
 {
 	struct menu_device *data = &__get_cpu_var(menu_devices);
-	int latency_req = pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY);
+	int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
 	int i;
 	int multiplier;
 
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index c2258a51fe0..7c469a62c3c 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -159,107 +159,131 @@ static void i2c_device_shutdown(struct device *dev)
 		driver->shutdown(client);
 }
 
-#ifdef CONFIG_SUSPEND
-static int i2c_device_pm_suspend(struct device *dev)
+#ifdef CONFIG_PM_SLEEP
+static int i2c_legacy_suspend(struct device *dev, pm_message_t mesg)
 {
-	const struct dev_pm_ops *pm;
+	struct i2c_client *client = i2c_verify_client(dev);
+	struct i2c_driver *driver;
 
-	if (!dev->driver)
+	if (!client || !dev->driver)
 		return 0;
-	pm = dev->driver->pm;
-	if (!pm || !pm->suspend)
+	driver = to_i2c_driver(dev->driver);
+	if (!driver->suspend)
 		return 0;
-	return pm->suspend(dev);
+	return driver->suspend(client, mesg);
 }
 
-static int i2c_device_pm_resume(struct device *dev)
+static int i2c_legacy_resume(struct device *dev)
 {
-	const struct dev_pm_ops *pm;
+	struct i2c_client *client = i2c_verify_client(dev);
+	struct i2c_driver *driver;
 
-	if (!dev->driver)
+	if (!client || !dev->driver)
 		return 0;
-	pm = dev->driver->pm;
-	if (!pm || !pm->resume)
+	driver = to_i2c_driver(dev->driver);
+	if (!driver->resume)
 		return 0;
-	return pm->resume(dev);
+	return driver->resume(client);
 }
-#else
-#define i2c_device_pm_suspend	NULL
-#define i2c_device_pm_resume	NULL
-#endif
 
-#ifdef CONFIG_PM_RUNTIME
-static int i2c_device_runtime_suspend(struct device *dev)
+static int i2c_device_pm_suspend(struct device *dev)
 {
-	const struct dev_pm_ops *pm;
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (!dev->driver)
-		return 0;
-	pm = dev->driver->pm;
-	if (!pm || !pm->runtime_suspend)
+	if (pm_runtime_suspended(dev))
 		return 0;
-	return pm->runtime_suspend(dev);
-}
 
-static int i2c_device_runtime_resume(struct device *dev)
-{
-	const struct dev_pm_ops *pm;
+	if (pm)
+		return pm->suspend ? pm->suspend(dev) : 0;
 
-	if (!dev->driver)
-		return 0;
-	pm = dev->driver->pm;
-	if (!pm || !pm->runtime_resume)
-		return 0;
-	return pm->runtime_resume(dev);
+	return i2c_legacy_suspend(dev, PMSG_SUSPEND);
 }
 
-static int i2c_device_runtime_idle(struct device *dev)
+static int i2c_device_pm_resume(struct device *dev)
 {
-	const struct dev_pm_ops *pm = NULL;
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int ret;
 
-	if (dev->driver)
-		pm = dev->driver->pm;
-	if (pm && pm->runtime_idle) {
-		ret = pm->runtime_idle(dev);
-		if (ret)
-			return ret;
+	if (pm)
+		ret = pm->resume ? pm->resume(dev) : 0;
+	else
+		ret = i2c_legacy_resume(dev);
+
+	if (!ret) {
+		pm_runtime_disable(dev);
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
 	}
 
-	return pm_runtime_suspend(dev);
+	return ret;
 }
-#else
-#define i2c_device_runtime_suspend	NULL
-#define i2c_device_runtime_resume	NULL
-#define i2c_device_runtime_idle		NULL
-#endif
 
-static int i2c_device_suspend(struct device *dev, pm_message_t mesg)
+static int i2c_device_pm_freeze(struct device *dev)
 {
-	struct i2c_client *client = i2c_verify_client(dev);
-	struct i2c_driver *driver;
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (!client || !dev->driver)
+	if (pm_runtime_suspended(dev))
 		return 0;
-	driver = to_i2c_driver(dev->driver);
-	if (!driver->suspend)
-		return 0;
-	return driver->suspend(client, mesg);
+
+	if (pm)
+		return pm->freeze ? pm->freeze(dev) : 0;
+
+	return i2c_legacy_suspend(dev, PMSG_FREEZE);
 }
 
-static int i2c_device_resume(struct device *dev)
+static int i2c_device_pm_thaw(struct device *dev)
 {
-	struct i2c_client *client = i2c_verify_client(dev);
-	struct i2c_driver *driver;
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (!client || !dev->driver)
+	if (pm_runtime_suspended(dev))
 		return 0;
-	driver = to_i2c_driver(dev->driver);
-	if (!driver->resume)
+
+	if (pm)
+		return pm->thaw ? pm->thaw(dev) : 0;
+
+	return i2c_legacy_resume(dev);
+}
+
+static int i2c_device_pm_poweroff(struct device *dev)
+{
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+	if (pm_runtime_suspended(dev))
 		return 0;
-	return driver->resume(client);
+
+	if (pm)
+		return pm->poweroff ? pm->poweroff(dev) : 0;
+
+	return i2c_legacy_suspend(dev, PMSG_HIBERNATE);
 }
 
+static int i2c_device_pm_restore(struct device *dev)
+{
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+	int ret;
+
+	if (pm)
+		ret = pm->restore ? pm->restore(dev) : 0;
+	else
+		ret = i2c_legacy_resume(dev);
+
+	if (!ret) {
+		pm_runtime_disable(dev);
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
+	}
+
+	return ret;
+}
+#else /* !CONFIG_PM_SLEEP */
+#define i2c_device_pm_suspend	NULL
+#define i2c_device_pm_resume	NULL
+#define i2c_device_pm_freeze	NULL
+#define i2c_device_pm_thaw	NULL
+#define i2c_device_pm_poweroff	NULL
+#define i2c_device_pm_restore	NULL
+#endif /* !CONFIG_PM_SLEEP */
+
 static void i2c_client_dev_release(struct device *dev)
 {
 	kfree(to_i2c_client(dev));
@@ -301,9 +325,15 @@ static const struct attribute_group *i2c_dev_attr_groups[] = {
 static const struct dev_pm_ops i2c_device_pm_ops = {
 	.suspend = i2c_device_pm_suspend,
 	.resume = i2c_device_pm_resume,
-	.runtime_suspend = i2c_device_runtime_suspend,
-	.runtime_resume = i2c_device_runtime_resume,
-	.runtime_idle = i2c_device_runtime_idle,
+	.freeze = i2c_device_pm_freeze,
+	.thaw = i2c_device_pm_thaw,
+	.poweroff = i2c_device_pm_poweroff,
+	.restore = i2c_device_pm_restore,
+	SET_RUNTIME_PM_OPS(
+		pm_generic_runtime_suspend,
+		pm_generic_runtime_resume,
+		pm_generic_runtime_idle
+	)
 };
 
 struct bus_type i2c_bus_type = {
@@ -312,8 +342,6 @@ struct bus_type i2c_bus_type = {
 	.probe		= i2c_device_probe,
 	.remove		= i2c_device_remove,
 	.shutdown	= i2c_device_shutdown,
-	.suspend	= i2c_device_suspend,
-	.resume		= i2c_device_resume,
 	.pm		= &i2c_device_pm_ops,
 };
 EXPORT_SYMBOL_GPL(i2c_bus_type);
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index dbf81788bb4..d5d55c6a373 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -2524,12 +2524,12 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
 			 * excessive C-state transition latencies result in
 			 * dropped transactions.
 			 */
-			pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY,
-						  adapter->netdev->name, 55);
+			pm_qos_update_request(
+				adapter->netdev->pm_qos_req, 55);
 		} else {
-			pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY,
-						  adapter->netdev->name,
-						  PM_QOS_DEFAULT_VALUE);
+			pm_qos_update_request(
+				adapter->netdev->pm_qos_req,
+				PM_QOS_DEFAULT_VALUE);
 		}
 	}
 
@@ -2824,8 +2824,8 @@ int e1000e_up(struct e1000_adapter *adapter)
 
 	/* DMA latency requirement to workaround early-receive/jumbo issue */
 	if (adapter->flags & FLAG_HAS_ERT)
-		pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
-		                       adapter->netdev->name,
+		adapter->netdev->pm_qos_req =
+			pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
 				       PM_QOS_DEFAULT_VALUE);
 
 	/* hardware has been reset, we need to reload some things */
@@ -2887,9 +2887,11 @@ void e1000e_down(struct e1000_adapter *adapter)
 	e1000_clean_tx_ring(adapter);
 	e1000_clean_rx_ring(adapter);
 
-	if (adapter->flags & FLAG_HAS_ERT)
-		pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
-		                          adapter->netdev->name);
+	if (adapter->flags & FLAG_HAS_ERT) {
+		pm_qos_remove_request(
+			      adapter->netdev->pm_qos_req);
+		adapter->netdev->pm_qos_req = NULL;
+	}
 
 	/*
 	 * TODO: for power management, we could drop the link and
diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index 1b1edad1eb5..f16e981812a 100644
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -48,6 +48,7 @@
 #define DRV_VERSION "1.0.0-k0"
 char igbvf_driver_name[] = "igbvf";
 const char igbvf_driver_version[] = DRV_VERSION;
+struct pm_qos_request_list *igbvf_driver_pm_qos_req;
 static const char igbvf_driver_string[] =
 				"Intel(R) Virtual Function Network Driver";
 static const char igbvf_copyright[] = "Copyright (c) 2009 Intel Corporation.";
@@ -2899,7 +2900,7 @@ static int __init igbvf_init_module(void)
 	printk(KERN_INFO "%s\n", igbvf_copyright);
 
 	ret = pci_register_driver(&igbvf_driver);
-	pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY, igbvf_driver_name,
+	igbvf_driver_pm_qos_req = pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
 	                       PM_QOS_DEFAULT_VALUE);
 
 	return ret;
@@ -2915,7 +2916,8 @@ module_init(igbvf_init_module);
 static void __exit igbvf_exit_module(void)
 {
 	pci_unregister_driver(&igbvf_driver);
-	pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY, igbvf_driver_name);
+	pm_qos_remove_request(igbvf_driver_pm_qos_req);
+	igbvf_driver_pm_qos_req = NULL;
 }
 module_exit(igbvf_exit_module);
 
diff --git a/drivers/net/wireless/ipw2x00/ipw2100.c b/drivers/net/wireless/ipw2x00/ipw2100.c
index 9b72c45a774..2b05fe5e994 100644
--- a/drivers/net/wireless/ipw2x00/ipw2100.c
+++ b/drivers/net/wireless/ipw2x00/ipw2100.c
@@ -174,6 +174,8 @@ that only one external action is invoked at a time.
 #define DRV_DESCRIPTION	"Intel(R) PRO/Wireless 2100 Network Driver"
 #define DRV_COPYRIGHT	"Copyright(c) 2003-2006 Intel Corporation"
 
+struct pm_qos_request_list *ipw2100_pm_qos_req;
+
 /* Debugging stuff */
 #ifdef CONFIG_IPW2100_DEBUG
 #define IPW2100_RX_DEBUG	/* Reception debugging */
@@ -1739,7 +1741,7 @@ static int ipw2100_up(struct ipw2100_priv *priv, int deferred)
 	/* the ipw2100 hardware really doesn't want power management delays
 	 * longer than 175usec
 	 */
-	pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY, "ipw2100", 175);
+	pm_qos_update_request(ipw2100_pm_qos_req, 175);
 
 	/* If the interrupt is enabled, turn it off... */
 	spin_lock_irqsave(&priv->low_lock, flags);
@@ -1887,8 +1889,7 @@ static void ipw2100_down(struct ipw2100_priv *priv)
 	ipw2100_disable_interrupts(priv);
 	spin_unlock_irqrestore(&priv->low_lock, flags);
 
-	pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY, "ipw2100",
-			PM_QOS_DEFAULT_VALUE);
+	pm_qos_update_request(ipw2100_pm_qos_req, PM_QOS_DEFAULT_VALUE);
 
 	/* We have to signal any supplicant if we are disassociating */
 	if (associated)
@@ -6669,7 +6670,7 @@ static int __init ipw2100_init(void)
 	if (ret)
 		goto out;
 
-	pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY, "ipw2100",
+	ipw2100_pm_qos_req = pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
 			PM_QOS_DEFAULT_VALUE);
 #ifdef CONFIG_IPW2100_DEBUG
 	ipw2100_debug_level = debug;
@@ -6692,7 +6693,7 @@ static void __exit ipw2100_exit(void)
 			   &driver_attr_debug_level);
 #endif
 	pci_unregister_driver(&ipw2100_pci_driver);
-	pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY, "ipw2100");
+	pm_qos_remove_request(ipw2100_pm_qos_req);
 }
 
 module_init(ipw2100_init);