3.8-stable review patch. If anyone has any objections, please let me know.
------------------ From: "Rafael J. Wysocki" <[email protected]> commit 24ad0ef9c8b946ed2abe681e4e44f4a1e643d882 upstream. It turns out that the _Lxx control methods provided by some BIOSes clear the PME Status bit of PCI devices they handle, which means that pci_acpi_wake_dev() cannot really use that bit to check whether or not the device has signalled wakeup. One symptom of the problem is, for example, that when an affected PCI USB controller is runtime-suspended, then plugging in a new USB device into one of the controller's ports will not wake up the controller, which should happen. For this reason, make pci_acpi_wake_dev() always attempt to resume the device it is called for regardless of the device's PME Status bit value (that bit still has to be cleared if set at this point, though). Reported-by: Sarah Sharp <[email protected]> Signed-off-by: Rafael J. Wysocki <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Acked-by: Matthew Garrett <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/pci/pci-acpi.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -53,14 +53,15 @@ static void pci_acpi_wake_dev(acpi_handl return; } - if (!pci_dev->pm_cap || !pci_dev->pme_support - || pci_check_pme_status(pci_dev)) { - if (pci_dev->pme_poll) - pci_dev->pme_poll = false; + /* Clear PME Status if set. */ + if (pci_dev->pme_support) + pci_check_pme_status(pci_dev); - pci_wakeup_event(pci_dev); - pm_runtime_resume(&pci_dev->dev); - } + if (pci_dev->pme_poll) + pci_dev->pme_poll = false; + + pci_wakeup_event(pci_dev); + pm_runtime_resume(&pci_dev->dev); if (pci_dev->subordinate) pci_pme_wakeup_bus(pci_dev->subordinate); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
