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PCI PM: Introduce device flag wakeup_prepared 

Introduce a new PCI device flag, wakeup_prepared, to prevent PCI
wake-up preparation code from being executed twice in a row for the
same device and for the same purpose.

Reviewed-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Rafael J. Wysocki 2009-09-08 23:14:49 +02:00 committed by Jesse Barnes
parent df8db91fc3
commit e80bb09d2c
2 changed files with 9 additions and 0 deletions
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8
drivers/pci/pci.c
View File

@ -1225,6 +1225,10 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
if (enable && !device_may_wakeup(&dev->dev))
return -EINVAL;
/* Don't do the same thing twice in a row for one device. */
if (!!enable == !!dev->wakeup_prepared)
return 0;
/*
* According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
* Anderson we should be doing PME# wake enable followed by ACPI wake
@ -1241,9 +1245,12 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
error = platform_pci_sleep_wake(dev, true);
if (ret)
ret = error;
if (!ret)
dev->wakeup_prepared = true;
} else {
platform_pci_sleep_wake(dev, false);
pci_pme_active(dev, false);
dev->wakeup_prepared = false;
}
return ret;
@ -1365,6 +1372,7 @@ void pci_pm_init(struct pci_dev *dev)
int pm;
u16 pmc;
dev->wakeup_prepared = false;
dev->pm_cap = 0;
/* find PCI PM capability in list */

1
include/linux/pci.h
View File

@ -241,6 +241,7 @@ struct pci_dev {
unsigned int d1_support:1; /* Low power state D1 is supported */
unsigned int d2_support:1; /* Low power state D2 is supported */
unsigned int no_d1d2:1; /* Only allow D0 and D3 */
unsigned int wakeup_prepared:1;
#ifdef CONFIG_PCIEASPM
struct pcie_link_state *link_state; /* ASPM link state. */