aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/pci/pci.c8
-rw-r--r--include/linux/pci.h1
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 84a6d6d30c5..dcdfb2212ca 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -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 */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d80ed872a3c..f5c7cd343e5 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -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. */