Merge branch 'pm-runtime' into for-linus

* pm-runtime:
  OMAP: PM: disable idle on suspend for GPIO and UART
  OMAP: PM: omap_device: add API to disable idle on suspend
  OMAP: PM: omap_device: add system PM methods for PM domain handling
  OMAP: PM: omap_device: conditionally use PM domain runtime helpers
  PM / Runtime: Add new helper function: pm_runtime_status_suspended()
  PM / Runtime: Consistent utilization of deferred_resume
  PM / Runtime: Prevent runtime_resume from racing with probe
  PM / Runtime: Replace "run-time" with "runtime" in documentation
  PM / Runtime: Improve documentation of enable, disable and barrier
  PM: Limit race conditions between runtime PM and system sleep (v2)
  PCI / PM: Detect early wakeup in pci_pm_prepare()
  PM / Runtime: Return special error code if runtime PM is disabled
  PM / Runtime: Update documentation of interactions with system sleep

3 files changed, 67 insertions, 51 deletions

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 85b591a5429a..a85459126bc6 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -505,6 +505,7 @@ static int legacy_resume(struct device *dev, int (*cb)(struct device *dev))
 static int device_resume(struct device *dev, pm_message_t state, bool async)
 {
         int error = 0;
+        bool put = false;
 
         TRACE_DEVICE(dev);
         TRACE_RESUME(0);
@@ -521,6 +522,9 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
         if (!dev->power.is_suspended)
                 goto Unlock;
 
+        pm_runtime_enable(dev);
+        put = true;
+
         if (dev->pm_domain) {
                 pm_dev_dbg(dev, state, "power domain ");
                 error = pm_op(dev, &dev->pm_domain->ops, state);
@@ -563,6 +567,10 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
         complete_all(&dev->power.completion);
 
         TRACE_RESUME(error);
+
+        if (put)
+                pm_runtime_put_sync(dev);
+
         return error;
 }
 
@@ -843,16 +851,22 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
         int error = 0;
 
         dpm_wait_for_children(dev, async);
-        device_lock(dev);
 
         if (async_error)
-                goto Unlock;
+                return 0;
+
+        pm_runtime_get_noresume(dev);
+        if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
+                pm_wakeup_event(dev, 0);
 
         if (pm_wakeup_pending()) {
+                pm_runtime_put_sync(dev);
                 async_error = -EBUSY;
-                goto Unlock;
+                return 0;
         }
 
+        device_lock(dev);
+
         if (dev->pm_domain) {
                 pm_dev_dbg(dev, state, "power domain ");
                 error = pm_op(dev, &dev->pm_domain->ops, state);
@@ -890,12 +904,15 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
  End:
         dev->power.is_suspended = !error;
 
- Unlock:
         device_unlock(dev);
         complete_all(&dev->power.completion);
 
-        if (error)
+        if (error) {
+                pm_runtime_put_sync(dev);
                 async_error = error;
+        } else if (dev->power.is_suspended) {
+                __pm_runtime_disable(dev, false);
+        }
 
         return error;
 }
@@ -1035,13 +1052,7 @@ int dpm_prepare(pm_message_t state)
                 get_device(dev);
                 mutex_unlock(&dpm_list_mtx);
 
-                pm_runtime_get_noresume(dev);
-                if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
-                        pm_wakeup_event(dev, 0);
-
-                pm_runtime_put_sync(dev);
-                error = pm_wakeup_pending() ?
-                                -EBUSY : device_prepare(dev, state);
+                error = device_prepare(dev, state);
 
                 mutex_lock(&dpm_list_mtx);
                 if (error) {
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 5f5c4236f006..8dc247c974af 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1,5 +1,5 @@
 /*
- * drivers/base/power/runtime.c - Helper functions for device run-time PM
+ * drivers/base/power/runtime.c - Helper functions for device runtime PM
  *
  * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
  * Copyright (C) 2010 Alan Stern <stern@rowland.harvard.edu>
@@ -135,8 +135,9 @@ static int rpm_check_suspend_allowed(struct device *dev)
 
         if (dev->power.runtime_error)
                 retval = -EINVAL;
-        else if (atomic_read(&dev->power.usage_count) > 0
-            || dev->power.disable_depth > 0)
+        else if (dev->power.disable_depth > 0)
+                retval = -EACCES;
+        else if (atomic_read(&dev->power.usage_count) > 0)
                 retval = -EAGAIN;
         else if (!pm_children_suspended(dev))
                 retval = -EBUSY;
@@ -158,7 +159,7 @@ static int rpm_check_suspend_allowed(struct device *dev)
  * @dev: Device to notify the bus type about.
  * @rpmflags: Flag bits.
  *
- * Check if the device's run-time PM status allows it to be suspended.  If
+ * Check if the device's runtime PM status allows it to be suspended.  If
  * another idle notification has been started earlier, return immediately.  If
  * the RPM_ASYNC flag is set then queue an idle-notification request; otherwise
  * run the ->runtime_idle() callback directly.
@@ -262,15 +263,15 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
                 spin_lock_irq(&dev->power.lock);
         }
         dev->power.runtime_error = retval;
-        return retval;
+        return retval != -EACCES ? retval : -EIO;
 }
 
 /**
- * rpm_suspend - Carry out run-time suspend of given device.
+ * rpm_suspend - Carry out runtime suspend of given device.
  * @dev: Device to suspend.
  * @rpmflags: Flag bits.
  *
- * Check if the device's run-time PM status allows it to be suspended.  If
+ * Check if the device's runtime PM status allows it to be suspended.  If
  * another suspend has been started earlier, either return immediately or wait
  * for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC flags.  Cancel a
  * pending idle notification.  If the RPM_ASYNC flag is set then queue a
@@ -388,7 +389,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
         retval = rpm_callback(callback, dev);
         if (retval) {
                 __update_runtime_status(dev, RPM_ACTIVE);
-                dev->power.deferred_resume = 0;
+                dev->power.deferred_resume = false;
                 if (retval == -EAGAIN || retval == -EBUSY)
                         dev->power.runtime_error = 0;
                 else
@@ -429,11 +430,11 @@ static int rpm_suspend(struct device *dev, int rpmflags)
 }
 
 /**
- * rpm_resume - Carry out run-time resume of given device.
+ * rpm_resume - Carry out runtime resume of given device.
  * @dev: Device to resume.
  * @rpmflags: Flag bits.
  *
- * Check if the device's run-time PM status allows it to be resumed.  Cancel
+ * Check if the device's runtime PM status allows it to be resumed.  Cancel
  * any scheduled or pending requests.  If another resume has been started
  * earlier, either return immediately or wait for it to finish, depending on the
  * RPM_NOWAIT and RPM_ASYNC flags.  Similarly, if there's a suspend running in
@@ -458,7 +459,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
         if (dev->power.runtime_error)
                 retval = -EINVAL;
         else if (dev->power.disable_depth > 0)
-                retval = -EAGAIN;
+                retval = -EACCES;
         if (retval)
                 goto out;
 
@@ -550,7 +551,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
 
                 spin_lock(&parent->power.lock);
                 /*
-                 * We can resume if the parent's run-time PM is disabled or it
+                 * We can resume if the parent's runtime PM is disabled or it
                  * is set to ignore children.
                  */
                 if (!parent->power.disable_depth
@@ -614,11 +615,11 @@ static int rpm_resume(struct device *dev, int rpmflags)
 }
 
 /**
- * pm_runtime_work - Universal run-time PM work function.
+ * pm_runtime_work - Universal runtime PM work function.
  * @work: Work structure used for scheduling the execution of this function.
  *
  * Use @work to get the device object the work is to be done for, determine what
- * is to be done and execute the appropriate run-time PM function.
+ * is to be done and execute the appropriate runtime PM function.
  */
 static void pm_runtime_work(struct work_struct *work)
 {
@@ -717,7 +718,7 @@ int pm_schedule_suspend(struct device *dev, unsigned int delay)
 EXPORT_SYMBOL_GPL(pm_schedule_suspend);
 
 /**
- * __pm_runtime_idle - Entry point for run-time idle operations.
+ * __pm_runtime_idle - Entry point for runtime idle operations.
  * @dev: Device to send idle notification for.
  * @rpmflags: Flag bits.
  *
@@ -746,7 +747,7 @@ int __pm_runtime_idle(struct device *dev, int rpmflags)
 EXPORT_SYMBOL_GPL(__pm_runtime_idle);
 
 /**
- * __pm_runtime_suspend - Entry point for run-time put/suspend operations.
+ * __pm_runtime_suspend - Entry point for runtime put/suspend operations.
  * @dev: Device to suspend.
  * @rpmflags: Flag bits.
  *
@@ -775,7 +776,7 @@ int __pm_runtime_suspend(struct device *dev, int rpmflags)
 EXPORT_SYMBOL_GPL(__pm_runtime_suspend);
 
 /**
- * __pm_runtime_resume - Entry point for run-time resume operations.
+ * __pm_runtime_resume - Entry point for runtime resume operations.
  * @dev: Device to resume.
  * @rpmflags: Flag bits.
  *
@@ -801,11 +802,11 @@ int __pm_runtime_resume(struct device *dev, int rpmflags)
 EXPORT_SYMBOL_GPL(__pm_runtime_resume);
 
 /**
- * __pm_runtime_set_status - Set run-time PM status of a device.
+ * __pm_runtime_set_status - Set runtime PM status of a device.
  * @dev: Device to handle.
- * @status: New run-time PM status of the device.
+ * @status: New runtime PM status of the device.
  *
- * If run-time PM of the device is disabled or its power.runtime_error field is
+ * If runtime PM of the device is disabled or its power.runtime_error field is
  * different from zero, the status may be changed either to RPM_ACTIVE, or to
  * RPM_SUSPENDED, as long as that reflects the actual state of the device.
  * However, if the device has a parent and the parent is not active, and the
@@ -851,7 +852,7 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status)
 
                 /*
                  * It is invalid to put an active child under a parent that is
-                 * not active, has run-time PM enabled and the
+                 * not active, has runtime PM enabled and the
                  * 'power.ignore_children' flag unset.
                  */
                 if (!parent->power.disable_depth
@@ -885,7 +886,7 @@ EXPORT_SYMBOL_GPL(__pm_runtime_set_status);
  * @dev: Device to handle.
  *
  * Flush all pending requests for the device from pm_wq and wait for all
- * run-time PM operations involving the device in progress to complete.
+ * runtime PM operations involving the device in progress to complete.
  *
  * Should be called under dev->power.lock with interrupts disabled.
  */
@@ -933,7 +934,7 @@ static void __pm_runtime_barrier(struct device *dev)
  * Prevent the device from being suspended by incrementing its usage counter and
  * if there's a pending resume request for the device, wake the device up.
  * Next, make sure that all pending requests for the device have been flushed
- * from pm_wq and wait for all run-time PM operations involving the device in
+ * from pm_wq and wait for all runtime PM operations involving the device in
  * progress to complete.
  *
  * Return value:
@@ -963,18 +964,18 @@ int pm_runtime_barrier(struct device *dev)
 EXPORT_SYMBOL_GPL(pm_runtime_barrier);
 
 /**
- * __pm_runtime_disable - Disable run-time PM of a device.
+ * __pm_runtime_disable - Disable runtime PM of a device.
  * @dev: Device to handle.
  * @check_resume: If set, check if there's a resume request for the device.
  *
  * Increment power.disable_depth for the device and if was zero previously,
- * cancel all pending run-time PM requests for the device and wait for all
+ * cancel all pending runtime PM requests for the device and wait for all
  * operations in progress to complete.  The device can be either active or
- * suspended after its run-time PM has been disabled.
+ * suspended after its runtime PM has been disabled.
  *
  * If @check_resume is set and there's a resume request pending when
  * __pm_runtime_disable() is called and power.disable_depth is zero, the
- * function will wake up the device before disabling its run-time PM.
+ * function will wake up the device before disabling its runtime PM.
  */
 void __pm_runtime_disable(struct device *dev, bool check_resume)
 {
@@ -987,7 +988,7 @@ void __pm_runtime_disable(struct device *dev, bool check_resume)
 
         /*
          * Wake up the device if there's a resume request pending, because that
-         * means there probably is some I/O to process and disabling run-time PM
+         * means there probably is some I/O to process and disabling runtime PM
          * shouldn't prevent the device from processing the I/O.
          */
         if (check_resume && dev->power.request_pending
@@ -1012,7 +1013,7 @@ void __pm_runtime_disable(struct device *dev, bool check_resume)
 EXPORT_SYMBOL_GPL(__pm_runtime_disable);
 
 /**
- * pm_runtime_enable - Enable run-time PM of a device.
+ * pm_runtime_enable - Enable runtime PM of a device.
  * @dev: Device to handle.
  */
 void pm_runtime_enable(struct device *dev)
@@ -1031,7 +1032,7 @@ void pm_runtime_enable(struct device *dev)
 EXPORT_SYMBOL_GPL(pm_runtime_enable);
 
 /**
- * pm_runtime_forbid - Block run-time PM of a device.
+ * pm_runtime_forbid - Block runtime PM of a device.
  * @dev: Device to handle.
  *
  * Increase the device's usage count and clear its power.runtime_auto flag,
@@ -1054,7 +1055,7 @@ void pm_runtime_forbid(struct device *dev)
 EXPORT_SYMBOL_GPL(pm_runtime_forbid);
 
 /**
- * pm_runtime_allow - Unblock run-time PM of a device.
+ * pm_runtime_allow - Unblock runtime PM of a device.
  * @dev: Device to handle.
  *
  * Decrease the device's usage count and set its power.runtime_auto flag.
@@ -1075,12 +1076,12 @@ void pm_runtime_allow(struct device *dev)
 EXPORT_SYMBOL_GPL(pm_runtime_allow);
 
 /**
- * pm_runtime_no_callbacks - Ignore run-time PM callbacks for a device.
+ * pm_runtime_no_callbacks - Ignore runtime PM callbacks for a device.
  * @dev: Device to handle.
  *
  * Set the power.no_callbacks flag, which tells the PM core that this
- * device is power-managed through its parent and has no run-time PM
- * callbacks of its own.  The run-time sysfs attributes will be removed.
+ * device is power-managed through its parent and has no runtime PM
+ * callbacks of its own.  The runtime sysfs attributes will be removed.
  */
 void pm_runtime_no_callbacks(struct device *dev)
 {
@@ -1156,8 +1157,8 @@ static void update_autosuspend(struct device *dev, int old_delay, int old_use)
  * @delay: Value of the new delay in milliseconds.
  *
  * Set the device's power.autosuspend_delay value.  If it changes to negative
- * and the power.use_autosuspend flag is set, prevent run-time suspends.  If it
- * changes the other way, allow run-time suspends.
+ * and the power.use_autosuspend flag is set, prevent runtime suspends.  If it
+ * changes the other way, allow runtime suspends.
  */
 void pm_runtime_set_autosuspend_delay(struct device *dev, int delay)
 {
@@ -1177,7 +1178,7 @@ EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay);
  * @dev: Device to handle.
  * @use: New value for use_autosuspend.
  *
- * Set the device's power.use_autosuspend flag, and allow or prevent run-time
+ * Set the device's power.use_autosuspend flag, and allow or prevent runtime
  * suspends as needed.
  */
 void __pm_runtime_use_autosuspend(struct device *dev, bool use)
@@ -1194,7 +1195,7 @@ void __pm_runtime_use_autosuspend(struct device *dev, bool use)
 EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend);
 
 /**
- * pm_runtime_init - Initialize run-time PM fields in given device object.
+ * pm_runtime_init - Initialize runtime PM fields in given device object.
  * @dev: Device object to initialize.
  */
 void pm_runtime_init(struct device *dev)
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index a9f5b8979611..942d6a7c9ae1 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -116,12 +116,14 @@ static ssize_t control_store(struct device * dev, struct device_attribute *attr,
         cp = memchr(buf, '\n', n);
         if (cp)
                 len = cp - buf;
+        device_lock(dev);
         if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
                 pm_runtime_allow(dev);
         else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
                 pm_runtime_forbid(dev);
         else
-                return -EINVAL;
+                n = -EINVAL;
+        device_unlock(dev);
         return n;
 }
 
@@ -205,7 +207,9 @@ static ssize_t autosuspend_delay_ms_store(struct device *dev,
         if (strict_strtol(buf, 10, &delay) != 0 || delay != (int) delay)
                 return -EINVAL;
 
+        device_lock(dev);
         pm_runtime_set_autosuspend_delay(dev, delay);
+        device_unlock(dev);
         return n;
 }