PM / Sleep: Make pm_op() and pm_noirq_op() return callback pointers

Make the pm_op() and pm_noirq_op() functions return pointers to appropriate callbacks instead of executing those callbacks and returning their results. This change is required for a subsequent modification that will execute the corresponding driver callback if the subsystem callback returned by either pm_op(), or pm_noirq_op() is NULL. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
13 years ago · 9cf519d1c1
parent b00f4dc5ff
commit 9cf519d1c1
1 changed files with 95 additions and 102 deletions
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@ -32,6 +32,8 @@
 #include "../base.h"
 #include "power.h"

+typedef int (*pm_callback_t)(struct device *);
+
 /*
 * The entries in the dpm_list list are in a depth first order, simply
 * because children are guaranteed to be discovered after parents, and
@ -211,113 +213,70 @@ static void dpm_wait_for_children(struct device *dev, bool async)
       device_for_each_child(dev, &async, dpm_wait_fn);
 }

-static int dpm_run_callback(struct device *dev, int (*cb)(struct device *))
-{
-	ktime_t calltime;
-	int error;
-
-	if (!cb)
-		return 0;
-
-	calltime = initcall_debug_start(dev);
-
-	error = cb(dev);
-	suspend_report_result(cb, error);
-
-	initcall_debug_report(dev, calltime, error);
-
-	return error;
-}
-
 /**
- * pm_op - Execute the PM operation appropriate for given PM event.
- * @dev: Device to handle.
+ * pm_op - Return the PM operation appropriate for given PM event.
 * @ops: PM operations to choose from.
 * @state: PM transition of the system being carried out.
 */
-static int pm_op(struct device *dev,
-		 const struct dev_pm_ops *ops,
-		 pm_message_t state)
+static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)
 {
-	int error = 0;
-
 	switch (state.event) {
 #ifdef CONFIG_SUSPEND
 	case PM_EVENT_SUSPEND:
-		error = dpm_run_callback(dev, ops->suspend);
-		break;
+		return ops->suspend;
 	case PM_EVENT_RESUME:
-		error = dpm_run_callback(dev, ops->resume);
-		break;
+		return ops->resume;
 #endif /* CONFIG_SUSPEND */
 #ifdef CONFIG_HIBERNATE_CALLBACKS
 	case PM_EVENT_FREEZE:
 	case PM_EVENT_QUIESCE:
-		error = dpm_run_callback(dev, ops->freeze);
-		break;
+		return ops->freeze;
 	case PM_EVENT_HIBERNATE:
-		error = dpm_run_callback(dev, ops->poweroff);
-		break;
+		return ops->poweroff;
 	case PM_EVENT_THAW:
 	case PM_EVENT_RECOVER:
-		error = dpm_run_callback(dev, ops->thaw);
+		return ops->thaw;
 		break;
 	case PM_EVENT_RESTORE:
-		error = dpm_run_callback(dev, ops->restore);
-		break;
+		return ops->restore;
 #endif /* CONFIG_HIBERNATE_CALLBACKS */
-	default:
-		error = -EINVAL;
 	}

-	return error;
+	return NULL;
 }

 /**
- * pm_noirq_op - Execute the PM operation appropriate for given PM event.
- * @dev: Device to handle.
+ * pm_noirq_op - Return the PM operation appropriate for given PM event.
 * @ops: PM operations to choose from.
 * @state: PM transition of the system being carried out.
 *
 * The driver of @dev will not receive interrupts while this function is being
 * executed.
 */
-static int pm_noirq_op(struct device *dev,
-			const struct dev_pm_ops *ops,
-			pm_message_t state)
+static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state)
 {
-	int error = 0;
-
 	switch (state.event) {
 #ifdef CONFIG_SUSPEND
 	case PM_EVENT_SUSPEND:
-		error = dpm_run_callback(dev, ops->suspend_noirq);
-		break;
+		return ops->suspend_noirq;
 	case PM_EVENT_RESUME:
-		error = dpm_run_callback(dev, ops->resume_noirq);
-		break;
+		return ops->resume_noirq;
 #endif /* CONFIG_SUSPEND */
 #ifdef CONFIG_HIBERNATE_CALLBACKS
 	case PM_EVENT_FREEZE:
 	case PM_EVENT_QUIESCE:
-		error = dpm_run_callback(dev, ops->freeze_noirq);
-		break;
+		return ops->freeze_noirq;
 	case PM_EVENT_HIBERNATE:
-		error = dpm_run_callback(dev, ops->poweroff_noirq);
-		break;
+		return ops->poweroff_noirq;
 	case PM_EVENT_THAW:
 	case PM_EVENT_RECOVER:
-		error = dpm_run_callback(dev, ops->thaw_noirq);
-		break;
+		return ops->thaw_noirq;
 	case PM_EVENT_RESTORE:
-		error = dpm_run_callback(dev, ops->restore_noirq);
-		break;
+		return ops->restore_noirq;
 #endif /* CONFIG_HIBERNATE_CALLBACKS */
-	default:
-		error = -EINVAL;
 	}

-	return error;
+	return NULL;
 }

 static char *pm_verb(int event)
@ -375,6 +334,26 @@ static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)
 		usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
 }

+static int dpm_run_callback(pm_callback_t cb, struct device *dev,
+			    pm_message_t state, char *info)
+{
+	ktime_t calltime;
+	int error;
+
+	if (!cb)
+		return 0;
+
+	calltime = initcall_debug_start(dev);
+
+	pm_dev_dbg(dev, state, info);
+	error = cb(dev);
+	suspend_report_result(cb, error);
+
+	initcall_debug_report(dev, calltime, error);
+
+	return error;
+}
+
 /*------------------------- Resume routines -------------------------*/

 /**
@ -387,25 +366,29 @@ static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)
 */
 static int device_resume_noirq(struct device *dev, pm_message_t state)
 {
+	pm_callback_t callback = NULL;
+	char *info = NULL;
 	int error = 0;

 	TRACE_DEVICE(dev);
 	TRACE_RESUME(0);

 	if (dev->pm_domain) {
-		pm_dev_dbg(dev, state, "EARLY power domain ");
-		error = pm_noirq_op(dev, &dev->pm_domain->ops, state);
+		info = "EARLY power domain ";
+		callback = pm_noirq_op(&dev->pm_domain->ops, state);
 	} else if (dev->type && dev->type->pm) {
-		pm_dev_dbg(dev, state, "EARLY type ");
-		error = pm_noirq_op(dev, dev->type->pm, state);
+		info = "EARLY type ";
+		callback = pm_noirq_op(dev->type->pm, state);
 	} else if (dev->class && dev->class->pm) {
-		pm_dev_dbg(dev, state, "EARLY class ");
-		error = pm_noirq_op(dev, dev->class->pm, state);
+		info = "EARLY class ";
+		callback = pm_noirq_op(dev->class->pm, state);
 	} else if (dev->bus && dev->bus->pm) {
-		pm_dev_dbg(dev, state, "EARLY ");
-		error = pm_noirq_op(dev, dev->bus->pm, state);
+		info = "EARLY ";
+		callback = pm_noirq_op(dev->bus->pm, state);
 	}

+	error = dpm_run_callback(callback, dev, state, info);
+
 	TRACE_RESUME(error);
 	return error;
 }
@ -455,6 +438,8 @@ EXPORT_SYMBOL_GPL(dpm_resume_noirq);
 */
 static int device_resume(struct device *dev, pm_message_t state, bool async)
 {
+	pm_callback_t callback = NULL;
+	char *info = NULL;
 	int error = 0;
 	bool put = false;

@ -477,40 +462,41 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
 	put = true;

 	if (dev->pm_domain) {
-		pm_dev_dbg(dev, state, "power domain ");
-		error = pm_op(dev, &dev->pm_domain->ops, state);
+		info = "power domain ";
+		callback = pm_op(&dev->pm_domain->ops, state);
 		goto End;
 	}

 	if (dev->type && dev->type->pm) {
-		pm_dev_dbg(dev, state, "type ");
-		error = pm_op(dev, dev->type->pm, state);
+		info = "type ";
+		callback = pm_op(dev->type->pm, state);
 		goto End;
 	}

 	if (dev->class) {
 		if (dev->class->pm) {
-			pm_dev_dbg(dev, state, "class ");
-			error = pm_op(dev, dev->class->pm, state);
+			info = "class ";
+			callback = pm_op(dev->class->pm, state);
 			goto End;
 		} else if (dev->class->resume) {
-			pm_dev_dbg(dev, state, "legacy class ");
-			error = dpm_run_callback(dev, dev->class->resume);
+			info = "legacy class ";
+			callback = dev->class->resume;
 			goto End;
 		}
 	}

 	if (dev->bus) {
 		if (dev->bus->pm) {
-			pm_dev_dbg(dev, state, "");
-			error = pm_op(dev, dev->bus->pm, state);
+			info = "";
+			callback = pm_op(dev->bus->pm, state);
 		} else if (dev->bus->resume) {
-			pm_dev_dbg(dev, state, "legacy ");
-			error = dpm_run_callback(dev, dev->bus->resume);
+			info = "legacy ";
+			callback = dev->bus->resume;
 		}
 	}

 End:
+	error = dpm_run_callback(callback, dev, state, info);
 	dev->power.is_suspended = false;

 Unlock:
@ -705,23 +691,24 @@ static pm_message_t resume_event(pm_message_t sleep_state)
 */
 static int device_suspend_noirq(struct device *dev, pm_message_t state)
 {
-	int error = 0;
+	pm_callback_t callback = NULL;
+	char *info = NULL;

 	if (dev->pm_domain) {
-		pm_dev_dbg(dev, state, "LATE power domain ");
-		error = pm_noirq_op(dev, &dev->pm_domain->ops, state);
+		info = "LATE power domain ";
+		callback = pm_noirq_op(&dev->pm_domain->ops, state);
 	} else if (dev->type && dev->type->pm) {
-		pm_dev_dbg(dev, state, "LATE type ");
-		error = pm_noirq_op(dev, dev->type->pm, state);
+		info = "LATE type ";
+		callback = pm_noirq_op(dev->type->pm, state);
 	} else if (dev->class && dev->class->pm) {
-		pm_dev_dbg(dev, state, "LATE class ");
-		error = pm_noirq_op(dev, dev->class->pm, state);
+		info = "LATE class ";
+		callback = pm_noirq_op(dev->class->pm, state);
 	} else if (dev->bus && dev->bus->pm) {
-		pm_dev_dbg(dev, state, "LATE ");
-		error = pm_noirq_op(dev, dev->bus->pm, state);
+		info = "LATE ";
+		callback = pm_noirq_op(dev->bus->pm, state);
 	}

-	return error;
+	return dpm_run_callback(callback, dev, state, info);
 }

 /**
@ -798,6 +785,8 @@ static int legacy_suspend(struct device *dev, pm_message_t state,
 */
 static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 {
+	pm_callback_t callback = NULL;
+	char *info = NULL;
 	int error = 0;

 	dpm_wait_for_children(dev, async);
@ -818,22 +807,22 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 	device_lock(dev);

 	if (dev->pm_domain) {
-		pm_dev_dbg(dev, state, "power domain ");
-		error = pm_op(dev, &dev->pm_domain->ops, state);
-		goto End;
+		info = "power domain ";
+		callback = pm_op(&dev->pm_domain->ops, state);
+		goto Run;
 	}

 	if (dev->type && dev->type->pm) {
-		pm_dev_dbg(dev, state, "type ");
-		error = pm_op(dev, dev->type->pm, state);
-		goto End;
+		info = "type ";
+		callback = pm_op(dev->type->pm, state);
+		goto Run;
 	}

 	if (dev->class) {
 		if (dev->class->pm) {
-			pm_dev_dbg(dev, state, "class ");
-			error = pm_op(dev, dev->class->pm, state);
-			goto End;
+			info = "class ";
+			callback = pm_op(dev->class->pm, state);
+			goto Run;
 		} else if (dev->class->suspend) {
 			pm_dev_dbg(dev, state, "legacy class ");
 			error = legacy_suspend(dev, state, dev->class->suspend);
@ -843,14 +832,18 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)

 	if (dev->bus) {
 		if (dev->bus->pm) {
-			pm_dev_dbg(dev, state, "");
-			error = pm_op(dev, dev->bus->pm, state);
+			info = "";
+			callback = pm_op(dev->bus->pm, state);
 		} else if (dev->bus->suspend) {
 			pm_dev_dbg(dev, state, "legacy ");
 			error = legacy_suspend(dev, state, dev->bus->suspend);
+			goto End;
 		}
 	}

+ Run:
+	error = dpm_run_callback(callback, dev, state, info);
+
 End:
 	if (!error) {
 		dev->power.is_suspended = true;