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path: root/drivers/base/power/main.c
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Diffstat (limited to 'drivers/base/power/main.c')
-rw-r--r--drivers/base/power/main.c66
1 files changed, 51 insertions, 15 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 86d5e4fb5b98..343ffad59377 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -479,7 +479,7 @@ static int device_resume_noirq(struct device *dev, pm_message_t state, bool asyn
TRACE_DEVICE(dev);
TRACE_RESUME(0);
- if (dev->power.syscore)
+ if (dev->power.syscore || dev->power.direct_complete)
goto Out;
if (!dev->power.is_noirq_suspended)
@@ -605,7 +605,7 @@ static int device_resume_early(struct device *dev, pm_message_t state, bool asyn
TRACE_DEVICE(dev);
TRACE_RESUME(0);
- if (dev->power.syscore)
+ if (dev->power.syscore || dev->power.direct_complete)
goto Out;
if (!dev->power.is_late_suspended)
@@ -735,6 +735,12 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
if (dev->power.syscore)
goto Complete;
+ if (dev->power.direct_complete) {
+ /* Match the pm_runtime_disable() in __device_suspend(). */
+ pm_runtime_enable(dev);
+ goto Complete;
+ }
+
dpm_wait(dev->parent, async);
dpm_watchdog_set(&wd, dev);
device_lock(dev);
@@ -1007,7 +1013,7 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
goto Complete;
}
- if (dev->power.syscore)
+ if (dev->power.syscore || dev->power.direct_complete)
goto Complete;
dpm_wait_for_children(dev, async);
@@ -1146,7 +1152,7 @@ static int __device_suspend_late(struct device *dev, pm_message_t state, bool as
goto Complete;
}
- if (dev->power.syscore)
+ if (dev->power.syscore || dev->power.direct_complete)
goto Complete;
dpm_wait_for_children(dev, async);
@@ -1332,6 +1338,17 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
if (dev->power.syscore)
goto Complete;
+ if (dev->power.direct_complete) {
+ if (pm_runtime_status_suspended(dev)) {
+ pm_runtime_disable(dev);
+ if (pm_runtime_suspended_if_enabled(dev))
+ goto Complete;
+
+ pm_runtime_enable(dev);
+ }
+ dev->power.direct_complete = false;
+ }
+
dpm_watchdog_set(&wd, dev);
device_lock(dev);
@@ -1382,10 +1399,19 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
End:
if (!error) {
+ struct device *parent = dev->parent;
+
dev->power.is_suspended = true;
- if (dev->power.wakeup_path
- && dev->parent && !dev->parent->power.ignore_children)
- dev->parent->power.wakeup_path = true;
+ if (parent) {
+ spin_lock_irq(&parent->power.lock);
+
+ dev->parent->power.direct_complete = false;
+ if (dev->power.wakeup_path
+ && !dev->parent->power.ignore_children)
+ dev->parent->power.wakeup_path = true;
+
+ spin_unlock_irq(&parent->power.lock);
+ }
}
device_unlock(dev);
@@ -1487,7 +1513,7 @@ static int device_prepare(struct device *dev, pm_message_t state)
{
int (*callback)(struct device *) = NULL;
char *info = NULL;
- int error = 0;
+ int ret = 0;
if (dev->power.syscore)
return 0;
@@ -1523,17 +1549,27 @@ static int device_prepare(struct device *dev, pm_message_t state)
callback = dev->driver->pm->prepare;
}
- if (callback) {
- error = callback(dev);
- suspend_report_result(callback, error);
- }
+ if (callback)
+ ret = callback(dev);
device_unlock(dev);
- if (error)
+ if (ret < 0) {
+ suspend_report_result(callback, ret);
pm_runtime_put(dev);
-
- return error;
+ return ret;
+ }
+ /*
+ * A positive return value from ->prepare() means "this device appears
+ * to be runtime-suspended and its state is fine, so if it really is
+ * runtime-suspended, you can leave it in that state provided that you
+ * will do the same thing with all of its descendants". This only
+ * applies to suspend transitions, however.
+ */
+ spin_lock_irq(&dev->power.lock);
+ dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND;
+ spin_unlock_irq(&dev->power.lock);
+ return 0;
}
/**