[RFC][PATCH 9/10] PCI PM: Run default PM callbacks for all devices using new framework

[Rafael J. Wysocki]

It should be quite clear that it generally makes sense to execute
the default PM callbacks (ie. the callbacks used for handling
suspend, hibernation and resume of PCI devices without drivers) for
all devices.  Of course, the drivers that provide legacy PCI PM
support (ie. the ->suspend, ->suspend_late, ->resume_early
or ->resume hooks in the pci_driver structure), carry out these
operations too, so we can't do it for devices with such drivers.
Still, we can make the default PM callbacks run for devices with
drivers using the new framework (ie. implement the pm object), since
there are no such drivers at the moment.

This also simplifies the code and reduces its size.

Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
 drivers/pci/pci-driver.c |  135 ++++++++++++++++++-----------------------------
 1 file changed, 53 insertions(+), 82 deletions(-)

Index: linux-2.6/drivers/pci/pci-driver.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci-driver.c
+++ linux-2.6/drivers/pci/pci-driver.c
@@ -472,6 +472,8 @@ static void pci_pm_default_suspend(struc
 
 	if (!pci_is_bridge(pci_dev))
 		pci_prepare_to_sleep(pci_dev);
+
+	pci_fixup_device(pci_fixup_suspend, pci_dev);
 }
 
 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
@@ -514,16 +516,13 @@ static int pci_pm_suspend(struct device 
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_SUSPEND);
 
-	if (drv && drv->pm) {
-		if (drv->pm->suspend) {
-			error = drv->pm->suspend(dev);
-			suspend_report_result(drv->pm->suspend, error);
-		}
-	} else {
-		pci_pm_default_suspend(pci_dev);
+	if (drv && drv->pm && drv->pm->suspend) {
+		error = drv->pm->suspend(dev);
+		suspend_report_result(drv->pm->suspend, error);
 	}
 
-	pci_fixup_device(pci_fixup_suspend, pci_dev);
+	if (!error)
+		pci_pm_default_suspend(pci_dev);
 
 	return error;
 }
@@ -537,15 +536,14 @@ static int pci_pm_suspend_noirq(struct d
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
 
-	if (drv && drv->pm) {
-		if (drv->pm->suspend_noirq) {
-			error = drv->pm->suspend_noirq(dev);
-			suspend_report_result(drv->pm->suspend_noirq, error);
-		}
-	} else {
-		pci_pm_set_unknown_state(pci_dev);
+	if (drv && drv->pm && drv->pm->suspend_noirq) {
+		error = drv->pm->suspend_noirq(dev);
+		suspend_report_result(drv->pm->suspend_noirq, error);
 	}
 
+	if (!error)
+		pci_pm_set_unknown_state(pci_dev);
+
 	return error;
 }
 
@@ -558,14 +556,10 @@ static int pci_pm_resume(struct device *
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume(dev);
 
-	if (drv && drv->pm) {
-		pci_fixup_device(pci_fixup_resume, pci_dev);
+	error = pci_pm_default_resume(pci_dev);
 
-		if (drv->pm->resume)
-			error = drv->pm->resume(dev);
-	} else {
-		error = pci_pm_default_resume(pci_dev);
-	}
+	if (!error && drv && drv->pm && drv->pm->resume)
+		error = drv->pm->resume(dev);
 
 	return error;
 }
@@ -579,14 +573,10 @@ static int pci_pm_resume_noirq(struct de
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume_early(dev);
 
-	if (drv && drv->pm) {
-		pci_fixup_device(pci_fixup_resume_early, pci_dev);
+	pci_pm_default_resume_noirq(pci_dev);
 
-		if (drv->pm->resume_noirq)
-			error = drv->pm->resume_noirq(dev);
-	} else {
-		pci_pm_default_resume_noirq(pci_dev);
-	}
+	if (drv && drv->pm && drv->pm->resume_noirq)
+		error = drv->pm->resume_noirq(dev);
 
 	return error;
 }
@@ -611,15 +601,14 @@ static int pci_pm_freeze(struct device *
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_FREEZE);
 
-	if (drv && drv->pm) {
-		if (drv->pm->freeze) {
-			error = drv->pm->freeze(dev);
-			suspend_report_result(drv->pm->freeze, error);
-		}
-	} else {
-		pci_pm_default_suspend_generic(pci_dev);
+	if (drv && drv->pm && drv->pm->freeze) {
+		error = drv->pm->freeze(dev);
+		suspend_report_result(drv->pm->freeze, error);
 	}
 
+	if (!error)
+		pci_pm_default_suspend_generic(pci_dev);
+
 	return error;
 }
 
@@ -632,15 +621,14 @@ static int pci_pm_freeze_noirq(struct de
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend_late(dev, PMSG_FREEZE);
 
-	if (drv && drv->pm) {
-		if (drv->pm->freeze_noirq) {
-			error = drv->pm->freeze_noirq(dev);
-			suspend_report_result(drv->pm->freeze_noirq, error);
-		}
-	} else {
-		pci_pm_set_unknown_state(pci_dev);
+	if (drv && drv->pm && drv->pm->freeze_noirq) {
+		error = drv->pm->freeze_noirq(dev);
+		suspend_report_result(drv->pm->freeze_noirq, error);
 	}
 
+	if (!error)
+		pci_pm_set_unknown_state(pci_dev);
+
 	return error;
 }
 
@@ -653,12 +641,10 @@ static int pci_pm_thaw(struct device *de
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume(dev);
 
-	if (drv && drv->pm) {
-		if (drv->pm->thaw)
-			error =  drv->pm->thaw(dev);
-	} else {
-		pci_pm_reenable_device(pci_dev);
-	}
+	pci_pm_reenable_device(pci_dev);
+
+	if (drv && drv->pm && drv->pm->thaw)
+		error =  drv->pm->thaw(dev);
 
 	return error;
 }
@@ -672,12 +658,10 @@ static int pci_pm_thaw_noirq(struct devi
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume_early(dev);
 
-	if (drv && drv->pm) {
-		if (drv->pm->thaw_noirq)
-			error = drv->pm->thaw_noirq(dev);
-	} else {
-		pci_update_current_state(pci_dev, PCI_D0);
-	}
+	pci_update_current_state(pci_dev, PCI_D0);
+
+	if (drv && drv->pm && drv->pm->thaw_noirq)
+		error = drv->pm->thaw_noirq(dev);
 
 	return error;
 }
@@ -691,16 +675,13 @@ static int pci_pm_poweroff(struct device
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_HIBERNATE);
 
-	if (drv && drv->pm) {
-		if (drv->pm->poweroff) {
-			error = drv->pm->poweroff(dev);
-			suspend_report_result(drv->pm->poweroff, error);
-		}
-	} else {
-		pci_pm_default_suspend(pci_dev);
+	if (drv && drv->pm && drv->pm->poweroff) {
+		error = drv->pm->poweroff(dev);
+		suspend_report_result(drv->pm->poweroff, error);
 	}
 
-	pci_fixup_device(pci_fixup_suspend, pci_dev);
+	if (!error)
+		pci_pm_default_suspend(pci_dev);
 
 	return error;
 }
@@ -713,11 +694,9 @@ static int pci_pm_poweroff_noirq(struct 
 	if (pci_has_legacy_pm_support(to_pci_dev(dev)))
 		return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
 
-	if (drv && drv->pm) {
-		if (drv->pm->poweroff_noirq) {
-			error = drv->pm->poweroff_noirq(dev);
-			suspend_report_result(drv->pm->poweroff_noirq, error);
-		}
+	if (drv && drv->pm && drv->pm->poweroff_noirq) {
+		error = drv->pm->poweroff_noirq(dev);
+		suspend_report_result(drv->pm->poweroff_noirq, error);
 	}
 
 	return error;
@@ -732,14 +711,10 @@ static int pci_pm_restore(struct device 
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume(dev);
 
-	if (drv && drv->pm) {
-		pci_fixup_device(pci_fixup_resume, pci_dev);
+	error = pci_pm_default_resume(pci_dev);
 
-		if (drv->pm->restore)
-			error = drv->pm->restore(dev);
-	} else {
-		error = pci_pm_default_resume(pci_dev);
-	}
+	if (!error && drv && drv->pm && drv->pm->restore)
+		error = drv->pm->restore(dev);
 
 	return error;
 }
@@ -753,14 +728,10 @@ static int pci_pm_restore_noirq(struct d
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume_early(dev);
 
-	if (drv && drv->pm) {
-		pci_fixup_device(pci_fixup_resume_early, pci_dev);
+	pci_pm_default_resume_noirq(pci_dev);
 
-		if (drv->pm->restore_noirq)
-			error = drv->pm->restore_noirq(dev);
-	} else {
-		pci_pm_default_resume_noirq(pci_dev);
-	}
+	if (drv && drv->pm && drv->pm->restore_noirq)
+		error = drv->pm->restore_noirq(dev);
 
 	return error;
 }

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