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PCI PM: Add suspend counterpart of pci_reenable_device

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PCI devices without drivers are not disabled during suspend and
hibernation, but they are enabled during resume, with the help of
pci_reenable_device(), so there is an unbalanced execution of
pcibios_enable_device() in the resume code path.

To correct this introduce function pci_disable_enabled_device()
that will disable the argument device, if it is enabled when the
function is being run, without updating the device's pci_dev
structure and use it in the suspend code path to balance the
pci_reenable_device() executed during resume.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Rafael J. Wysocki
2009-01-07 13:03:42 +01:00
committed by Jesse Barnes
parent c9b9972b3c
commit fa58d305d9
3 changed files with 59 additions and 13 deletions
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35
drivers/pci/pci-driver.c
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@@ -324,9 +324,19 @@ static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
/*
* Default "suspend" method for devices that have no driver provided suspend,
* or not even a driver at all.
* or not even a driver at all (first part).
*/
static void pci_default_pm_suspend(struct pci_dev *pci_dev)
static void pci_default_pm_suspend_early(struct pci_dev *pci_dev)
{
/* If device is enabled at this point, disable it */
pci_disable_enabled_device(pci_dev);
}
/*
* 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)
{
pci_save_state(pci_dev);
/*
@@ -377,7 +387,11 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state)
i = drv->suspend(pci_dev, state);
suspend_report_result(drv->suspend, i);
} else {
pci_default_pm_suspend(pci_dev);
/*
* For compatibility with existing code with legacy PM support
* don't call pci_default_pm_suspend_early() here.
*/
pci_default_pm_suspend_late(pci_dev);
}
return i;
}
@@ -455,7 +469,10 @@ static int pci_pm_suspend(struct device *dev)
}
} else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend(dev, PMSG_SUSPEND);
} else {
pci_default_pm_suspend_early(pci_dev);
}
pci_fixup_device(pci_fixup_suspend, pci_dev);
return error;
@@ -475,7 +492,7 @@ static int pci_pm_suspend_noirq(struct device *dev)
} else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend_late(dev, PMSG_SUSPEND);
} else {
pci_default_pm_suspend(pci_dev);
pci_default_pm_suspend_late(pci_dev);
}
return error;
@@ -546,6 +563,8 @@ static int pci_pm_freeze(struct device *dev)
} 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_default_pm_suspend_early(pci_dev);
}
return error;
@@ -565,7 +584,7 @@ static int pci_pm_freeze_noirq(struct device *dev)
} else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend_late(dev, PMSG_FREEZE);
} else {
pci_default_pm_suspend(pci_dev);
pci_default_pm_suspend_late(pci_dev);
}
return error;
@@ -583,6 +602,8 @@ static int pci_pm_thaw(struct device *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);
}
return error;
@@ -600,6 +621,8 @@ static int pci_pm_thaw_noirq(struct device *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_default_pm_resume_early(pci_dev);
}
return error;
@@ -618,6 +641,8 @@ static int pci_pm_poweroff(struct device *dev)
}
} else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend(dev, PMSG_HIBERNATE);
} else {
pci_default_pm_suspend_early(pci_dev);
}
pci_fixup_device(pci_fixup_suspend, pci_dev);