linux-2.6.33/__pm_runtime_resume()
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開始行:
*参照元 [#i450a3a2]
#backlinks
*説明 [#q115905f]
-パス: [[linux-2.6.33/drivers/base/power/runtime.c]]
-FIXME: これは何？
--説明
**引数 [#q618ee0d]
-struct device *dev
--
--[[linux-2.6.33/device]]
-bool from_wq
--
**返り値 [#t08c19ae]
-int
--
**参考 [#s8c3a499]
*実装 [#x9772b18]
/**
* __pm_runtime_resume - Carry out run-time resume of gi...
* @dev: Device to resume.
* @from_wq: If set, the function has been called via pm...
*
* Check if the device can be woken up and run the ->run...
* provided by its bus type. If another resume has been...
* for it to finish. If there's a suspend running in pa...
* function, wait for it to finish and resume the device...
* or pending requests.
*
* This function must be called under dev->power.lock wi...
*/
int __pm_runtime_resume(struct device *dev, bool from_wq)
__releases(&dev->power.lock) __acquires(&dev->power.lock)
{
-
--[[linux-2.6.33/__releases()]]
-
--[[linux-2.6.33/__acquires()]]
struct device *parent = NULL;
int retval = 0;
dev_dbg(dev, "__pm_runtime_resume()%s!\n",
from_wq ? " from workqueue" : "");
-
--[[linux-2.6.33/dev_dbg()]]
repeat:
if (dev->power.runtime_error) {
retval = -EINVAL;
goto out;
}
pm_runtime_cancel_pending(dev);
-
--[[linux-2.6.33/pm_runtime_cancel_pending()]]
if (dev->power.runtime_status == RPM_ACTIVE)
retval = 1;
else if (dev->power.disable_depth > 0)
retval = -EAGAIN;
if (retval)
goto out;
if (dev->power.runtime_status == RPM_RESUMING
|| dev->power.runtime_status == RPM_SUSPENDING) {
DEFINE_WAIT(wait);
-
--[[linux-2.6.33/DEFINE_WAIT()]]
if (from_wq) {
if (dev->power.runtime_status == RPM_SUSPENDING)
dev->power.deferred_resume = true;
retval = -EINPROGRESS;
goto out;
}
/* Wait for the operation carried out in parallel with...
for (;;) {
prepare_to_wait(&dev->power.wait_queue, &wait,
TASK_UNINTERRUPTIBLE);
if (dev->power.runtime_status != RPM_RESUMING
&& dev->power.runtime_status != RPM_SUSPENDING)
break;
-
--[[linux-2.6.33/prepare_to_wait()]]
spin_unlock_irq(&dev->power.lock);
-
--[[linux-2.6.33/spin_unlock_irq()]]
schedule();
-
--[[linux-2.6.33/schedule()]]
spin_lock_irq(&dev->power.lock);
-
--[[linux-2.6.33/spin_lock_irq()]]
}
finish_wait(&dev->power.wait_queue, &wait);
goto repeat;
-
--[[linux-2.6.33/finish_wait()]]
}
if (!parent && dev->parent) {
/*
* Increment the parent's resume counter and resume it...
* necessary.
*/
parent = dev->parent;
spin_unlock(&dev->power.lock);
pm_runtime_get_noresume(parent);
-
--[[linux-2.6.33/pm_runtime_get_noresume()]]
spin_lock(&parent->power.lock);
/*
* We can resume if the parent's run-time PM is disabl...
* is set to ignore children.
*/
if (!parent->power.disable_depth
&& !parent->power.ignore_children) {
__pm_runtime_resume(parent, false);
if (parent->power.runtime_status != RPM_ACTIVE)
retval = -EBUSY;
}
-
--[[linux-2.6.33/__pm_runtime_resume()]]
spin_unlock(&parent->power.lock);
spin_lock(&dev->power.lock);
if (retval)
goto out;
goto repeat;
}
dev->power.runtime_status = RPM_RESUMING;
if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_r...
spin_unlock_irq(&dev->power.lock);
retval = dev->bus->pm->runtime_resume(dev);
spin_lock_irq(&dev->power.lock);
dev->power.runtime_error = retval;
} else if (dev->type && dev->type->pm
&& dev->type->pm->runtime_resume) {
spin_unlock_irq(&dev->power.lock);
retval = dev->type->pm->runtime_resume(dev);
spin_lock_irq(&dev->power.lock);
dev->power.runtime_error = retval;
} else if (dev->class && dev->class->pm
&& dev->class->pm->runtime_resume) {
spin_unlock_irq(&dev->power.lock);
retval = dev->class->pm->runtime_resume(dev);
spin_lock_irq(&dev->power.lock);
dev->power.runtime_error = retval;
} else {
retval = -ENOSYS;
}
if (retval) {
dev->power.runtime_status = RPM_SUSPENDED;
pm_runtime_cancel_pending(dev);
-
--[[linux-2.6.33/pm_runtime_cancel_pending()]]
} else {
dev->power.runtime_status = RPM_ACTIVE;
if (parent)
atomic_inc(&parent->power.child_count);
-
--[[linux-2.6.33/atomic_inc()]]
}
wake_up_all(&dev->power.wait_queue);
-
--[[linux-2.6.33/wake_up_all()]]
if (!retval)
__pm_request_idle(dev);
-
--[[linux-2.6.33/__pm_request_idle()]]
out:
if (parent) {
spin_unlock_irq(&dev->power.lock);
pm_runtime_put(parent);
-
--[[linux-2.6.33/pm_runtime_put()]]
spin_lock_irq(&dev->power.lock);
}
dev_dbg(dev, "__pm_runtime_resume() returns %d!\n", ret...
return retval;
}
*コメント [#a388053f]
終了行:
*参照元 [#i450a3a2]
#backlinks
*説明 [#q115905f]
-パス: [[linux-2.6.33/drivers/base/power/runtime.c]]
-FIXME: これは何？
--説明
**引数 [#q618ee0d]
-struct device *dev
--
--[[linux-2.6.33/device]]
-bool from_wq
--
**返り値 [#t08c19ae]
-int
--
**参考 [#s8c3a499]
*実装 [#x9772b18]
/**
* __pm_runtime_resume - Carry out run-time resume of gi...
* @dev: Device to resume.
* @from_wq: If set, the function has been called via pm...
*
* Check if the device can be woken up and run the ->run...
* provided by its bus type. If another resume has been...
* for it to finish. If there's a suspend running in pa...
* function, wait for it to finish and resume the device...
* or pending requests.
*
* This function must be called under dev->power.lock wi...
*/
int __pm_runtime_resume(struct device *dev, bool from_wq)
__releases(&dev->power.lock) __acquires(&dev->power.lock)
{
-
--[[linux-2.6.33/__releases()]]
-
--[[linux-2.6.33/__acquires()]]
struct device *parent = NULL;
int retval = 0;
dev_dbg(dev, "__pm_runtime_resume()%s!\n",
from_wq ? " from workqueue" : "");
-
--[[linux-2.6.33/dev_dbg()]]
repeat:
if (dev->power.runtime_error) {
retval = -EINVAL;
goto out;
}
pm_runtime_cancel_pending(dev);
-
--[[linux-2.6.33/pm_runtime_cancel_pending()]]
if (dev->power.runtime_status == RPM_ACTIVE)
retval = 1;
else if (dev->power.disable_depth > 0)
retval = -EAGAIN;
if (retval)
goto out;
if (dev->power.runtime_status == RPM_RESUMING
|| dev->power.runtime_status == RPM_SUSPENDING) {
DEFINE_WAIT(wait);
-
--[[linux-2.6.33/DEFINE_WAIT()]]
if (from_wq) {
if (dev->power.runtime_status == RPM_SUSPENDING)
dev->power.deferred_resume = true;
retval = -EINPROGRESS;
goto out;
}
/* Wait for the operation carried out in parallel with...
for (;;) {
prepare_to_wait(&dev->power.wait_queue, &wait,
TASK_UNINTERRUPTIBLE);
if (dev->power.runtime_status != RPM_RESUMING
&& dev->power.runtime_status != RPM_SUSPENDING)
break;
-
--[[linux-2.6.33/prepare_to_wait()]]
spin_unlock_irq(&dev->power.lock);
-
--[[linux-2.6.33/spin_unlock_irq()]]
schedule();
-
--[[linux-2.6.33/schedule()]]
spin_lock_irq(&dev->power.lock);
-
--[[linux-2.6.33/spin_lock_irq()]]
}
finish_wait(&dev->power.wait_queue, &wait);
goto repeat;
-
--[[linux-2.6.33/finish_wait()]]
}
if (!parent && dev->parent) {
/*
* Increment the parent's resume counter and resume it...
* necessary.
*/
parent = dev->parent;
spin_unlock(&dev->power.lock);
pm_runtime_get_noresume(parent);
-
--[[linux-2.6.33/pm_runtime_get_noresume()]]
spin_lock(&parent->power.lock);
/*
* We can resume if the parent's run-time PM is disabl...
* is set to ignore children.
*/
if (!parent->power.disable_depth
&& !parent->power.ignore_children) {
__pm_runtime_resume(parent, false);
if (parent->power.runtime_status != RPM_ACTIVE)
retval = -EBUSY;
}
-
--[[linux-2.6.33/__pm_runtime_resume()]]
spin_unlock(&parent->power.lock);
spin_lock(&dev->power.lock);
if (retval)
goto out;
goto repeat;
}
dev->power.runtime_status = RPM_RESUMING;
if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_r...
spin_unlock_irq(&dev->power.lock);
retval = dev->bus->pm->runtime_resume(dev);
spin_lock_irq(&dev->power.lock);
dev->power.runtime_error = retval;
} else if (dev->type && dev->type->pm
&& dev->type->pm->runtime_resume) {
spin_unlock_irq(&dev->power.lock);
retval = dev->type->pm->runtime_resume(dev);
spin_lock_irq(&dev->power.lock);
dev->power.runtime_error = retval;
} else if (dev->class && dev->class->pm
&& dev->class->pm->runtime_resume) {
spin_unlock_irq(&dev->power.lock);
retval = dev->class->pm->runtime_resume(dev);
spin_lock_irq(&dev->power.lock);
dev->power.runtime_error = retval;
} else {
retval = -ENOSYS;
}
if (retval) {
dev->power.runtime_status = RPM_SUSPENDED;
pm_runtime_cancel_pending(dev);
-
--[[linux-2.6.33/pm_runtime_cancel_pending()]]
} else {
dev->power.runtime_status = RPM_ACTIVE;
if (parent)
atomic_inc(&parent->power.child_count);
-
--[[linux-2.6.33/atomic_inc()]]
}
wake_up_all(&dev->power.wait_queue);
-
--[[linux-2.6.33/wake_up_all()]]
if (!retval)
__pm_request_idle(dev);
-
--[[linux-2.6.33/__pm_request_idle()]]
out:
if (parent) {
spin_unlock_irq(&dev->power.lock);
pm_runtime_put(parent);
-
--[[linux-2.6.33/pm_runtime_put()]]
spin_lock_irq(&dev->power.lock);
}
dev_dbg(dev, "__pm_runtime_resume() returns %d!\n", ret...
return retval;
}
*コメント [#a388053f]
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