From 5b415f1e79e0c09366f26e3eabe751642059285a Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Tue, 7 Feb 2012 00:50:35 +0100 Subject: PCI / PM: Disable wakeup during shutdown for devices not enabled to wake up If a PCI device is enabled to generate wakeup signals (PME) when put into a low-power state by runtime PM, it will be still enabled to generate those signals after the system shutdown, unless its driver's .shutdown() callback takes care of the wakeup signals generation setting. Moreover, there are devices that are not enabled to wake up the system and that are configured by runtime PM to generate wakeup signals so that (runtime) remote wakeup works with them. Those devices should be reconfigured during system shutdown so that they don't generate wakeup signals, but at least some drivers don't do that. However, that very well may be done by the PCI core so that drivers don't have to worry about it. For this reason, modify pci_device_shutdown() to disable the generation of wakeup events for devices not supposed to wake up the system. References: https://bugzilla.kernel.org/show_bug.cgi?id=37952 Reported-and-tested-by: Kamil Iskra Signed-off-by: Rafael J. Wysocki Signed-off-by: Jesse Barnes --- drivers/pci/pci-driver.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 3623d65f8b86..5d19695c771a 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -430,6 +430,16 @@ static void pci_device_shutdown(struct device *dev) drv->shutdown(pci_dev); pci_msi_shutdown(pci_dev); pci_msix_shutdown(pci_dev); + + /* + * Devices may be enabled to wake up by runtime PM, but they need not + * be supposed to wake up the system from its "power off" state (e.g. + * ACPI S5). Therefore disable wakeup for all devices that aren't + * supposed to wake up the system at this point. The state argument + * will be ignored by pci_enable_wake(). + */ + if (!device_may_wakeup(dev)) + pci_enable_wake(pci_dev, PCI_UNKNOWN, false); } #ifdef CONFIG_PM -- cgit v1.2.3