On Wednesday 07 January 2009, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@xxxxxxx>
>
> Rename two functions and rearrange code in drivers/pci/pci-driver.c
> so that it's easier to follow. In particular, separate invocations
> of the legacy callbacks from the rest of the new callbacks' code.
>
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Very sorry, I've sent a wrong (and buggy) version of this patch. The correct
one is appended.
Thanks,
Rafael
---
Subject: PCI PM: Rearrange code in pci-driver.c (rev. 3)
From: Rafael J. Wysocki <rjw@xxxxxxx>
Rename two functions and rearrange code in drivers/pci/pci-driver.c
so that it's easier to follow. In particular, separate invocations
of the legacy callbacks from the rest of the new callbacks' code.
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
drivers/pci/pci-driver.c | 116 ++++++++++++++++++++++++++++++-----------------
1 file changed, 75 insertions(+), 41 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
@@ -318,7 +318,7 @@ static void pci_device_shutdown(struct d
* Default "suspend" method for devices that have no driver provided suspend,
* or not even a driver at all (second part).
*/
-static void pci_default_pm_suspend_late(struct pci_dev *pci_dev)
+static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
{
/*
* mark its power state as "unknown", since we don't know if
@@ -332,7 +332,7 @@ static void pci_default_pm_suspend_late(
* Default "resume" method for devices that have no driver provided resume,
* or not even a driver at all (second part).
*/
-static int pci_default_pm_resume_late(struct pci_dev *pci_dev)
+static int pci_pm_reenable_device(struct pci_dev *pci_dev)
{
int retval;
@@ -363,7 +363,7 @@ static int pci_legacy_suspend(struct dev
* This is for compatibility with existing code with legacy PM
* support.
*/
- pci_default_pm_suspend_late(pci_dev);
+ pci_pm_set_unknown_state(pci_dev);
}
return i;
}
@@ -392,7 +392,7 @@ static int pci_legacy_resume(struct devi
} else {
/* restore the PCI config space */
pci_restore_state(pci_dev);
- error = pci_default_pm_resume_late(pci_dev);
+ error = pci_pm_reenable_device(pci_dev);
}
return error;
}
@@ -459,7 +459,7 @@ static int pci_pm_default_resume(struct
if (!pci_is_bridge(pci_dev))
pci_enable_wake(pci_dev, PCI_D0, false);
- return pci_default_pm_resume_late(pci_dev);
+ return pci_pm_reenable_device(pci_dev);
}
static void pci_pm_default_suspend_generic(struct pci_dev *pci_dev)
@@ -484,9 +484,17 @@ static void pci_pm_default_suspend(struc
static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
{
struct pci_driver *drv = pci_dev->driver;
-
- return drv && (drv->suspend || drv->suspend_late || drv->resume
+ bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
|| drv->resume_early);
+
+ /*
+ * Legacy PM support is used by default, so warn if the new framework is
+ * supported as well. Drivers are supposed to support either the
+ * former, or the latter, but not both at the same time.
+ */
+ WARN_ON(ret && drv->driver.pm);
+
+ return ret;
}
/* New power management framework */
@@ -518,17 +526,21 @@ static int pci_pm_suspend(struct device
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ error = pci_legacy_suspend(dev, PMSG_SUSPEND);
+ goto Exit;
+ }
+
if (drv && drv->pm) {
if (drv->pm->suspend) {
error = drv->pm->suspend(dev);
suspend_report_result(drv->pm->suspend, error);
}
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend(dev, PMSG_SUSPEND);
} else {
pci_pm_default_suspend(pci_dev);
}
+ Exit:
pci_fixup_device(pci_fixup_suspend, pci_dev);
return error;
@@ -540,15 +552,16 @@ static int pci_pm_suspend_noirq(struct d
struct device_driver *drv = dev->driver;
int error = 0;
+ 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 if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend_late(dev, PMSG_SUSPEND);
} else {
- pci_default_pm_suspend_late(pci_dev);
+ pci_pm_set_unknown_state(pci_dev);
}
return error;
@@ -560,14 +573,16 @@ static int pci_pm_resume(struct device *
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume, pci_dev);
+ return pci_legacy_resume(dev);
+ }
+
if (drv && drv->pm) {
pci_fixup_device(pci_fixup_resume, pci_dev);
if (drv->pm->resume)
error = drv->pm->resume(dev);
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- pci_fixup_device(pci_fixup_resume, pci_dev);
- error = pci_legacy_resume(dev);
} else {
error = pci_pm_default_resume(pci_dev);
}
@@ -581,14 +596,16 @@ static int pci_pm_resume_noirq(struct de
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume_early, pci_dev);
+ return pci_legacy_resume_early(dev);
+ }
+
if (drv && drv->pm) {
pci_fixup_device(pci_fixup_resume_early, pci_dev);
if (drv->pm->resume_noirq)
error = drv->pm->resume_noirq(dev);
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- pci_fixup_device(pci_fixup_resume_early, pci_dev);
- error = pci_legacy_resume_early(dev);
} else {
pci_pm_default_resume_noirq(pci_dev);
}
@@ -613,14 +630,17 @@ static int pci_pm_freeze(struct device *
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ error = pci_legacy_suspend(dev, PMSG_FREEZE);
+ pci_fixup_device(pci_fixup_suspend, pci_dev);
+ return error;
+ }
+
if (drv && drv->pm) {
if (drv->pm->freeze) {
error = drv->pm->freeze(dev);
suspend_report_result(drv->pm->freeze, error);
}
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend(dev, PMSG_FREEZE);
- pci_fixup_device(pci_fixup_suspend, pci_dev);
} else {
pci_pm_default_suspend_generic(pci_dev);
}
@@ -634,15 +654,16 @@ static int pci_pm_freeze_noirq(struct de
struct device_driver *drv = dev->driver;
int error = 0;
+ 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 if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend_late(dev, PMSG_FREEZE);
} else {
- pci_default_pm_suspend_late(pci_dev);
+ pci_pm_set_unknown_state(pci_dev);
}
return error;
@@ -654,14 +675,16 @@ static int pci_pm_thaw(struct device *de
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume, pci_dev);
+ return pci_legacy_resume(dev);
+ }
+
if (drv && drv->pm) {
if (drv->pm->thaw)
error = drv->pm->thaw(dev);
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- pci_fixup_device(pci_fixup_resume, pci_dev);
- error = pci_legacy_resume(dev);
} else {
- pci_default_pm_resume_late(pci_dev);
+ pci_pm_reenable_device(pci_dev);
}
return error;
@@ -673,12 +696,14 @@ static int pci_pm_thaw_noirq(struct devi
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev));
+ return pci_legacy_resume_early(dev);
+ }
+
if (drv && drv->pm) {
if (drv->pm->thaw_noirq)
error = drv->pm->thaw_noirq(dev);
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev));
- error = pci_legacy_resume_early(dev);
} else {
pci_update_current_state(pci_dev, PCI_D0);
}
@@ -692,17 +717,21 @@ static int pci_pm_poweroff(struct device
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ error = pci_legacy_suspend(dev, PMSG_HIBERNATE);
+ goto Exit;
+ }
+
if (drv && drv->pm) {
if (drv->pm->poweroff) {
error = drv->pm->poweroff(dev);
suspend_report_result(drv->pm->poweroff, error);
}
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend(dev, PMSG_HIBERNATE);
} else {
pci_pm_default_suspend(pci_dev);
}
+ Exit:
pci_fixup_device(pci_fixup_suspend, pci_dev);
return error;
@@ -713,13 +742,14 @@ static int pci_pm_poweroff_noirq(struct
struct device_driver *drv = dev->driver;
int error = 0;
+ 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);
}
- } else if (pci_has_legacy_pm_support(to_pci_dev(dev))) {
- error = pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
}
return error;
@@ -731,14 +761,16 @@ static int pci_pm_restore(struct device
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume, pci_dev);
+ return pci_legacy_resume(dev);
+ }
+
if (drv && drv->pm) {
pci_fixup_device(pci_fixup_resume, pci_dev);
if (drv->pm->restore)
error = drv->pm->restore(dev);
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- pci_fixup_device(pci_fixup_resume, pci_dev);
- error = pci_legacy_resume(dev);
} else {
error = pci_pm_default_resume(pci_dev);
}
@@ -752,14 +784,16 @@ static int pci_pm_restore_noirq(struct d
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume_early, pci_dev);
+ return pci_legacy_resume_early(dev);
+ }
+
if (drv && drv->pm) {
pci_fixup_device(pci_fixup_resume_early, pci_dev);
if (drv->pm->restore_noirq)
error = drv->pm->restore_noirq(dev);
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- pci_fixup_device(pci_fixup_resume_early, pci_dev);
- error = pci_legacy_resume_early(dev);
} else {
pci_pm_default_resume_noirq(pci_dev);
}
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