From e80bb09d2c73d76a2a4cd79e4a83802dd901c642 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Tue, 8 Sep 2009 23:14:49 +0200 Subject: 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 Signed-off-by: Rafael J. Wysocki Signed-off-by: Jesse Barnes --- drivers/pci/pci.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/pci') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 84a6d6d30c5a..dcdfb2212ca3 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 */ -- cgit v1.2.3