PCI/PM: Resume device before shutdown

Some actions during shutdown need device to be in D0 state, such as
MSI shutdown etc, so resume device before shutdown.

Without this patch, a device may not be enumerated after a kexec
because the corresponding bridge is not in D0, so that
configuration space of the device is not accessible.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: stable@vger.kernel.org		# v3.6+

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 94c6e2a..6c94fc9 100644 (file)
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -398,6 +398,8 @@ static void pci_device_shutdown(struct device *dev)
        struct pci_dev *pci_dev = to_pci_dev(dev);
        struct pci_driver *drv = pci_dev->driver;
 
+       pm_runtime_resume(dev);
+
        if (drv && drv->shutdown)
                drv->shutdown(pci_dev);
        pci_msi_shutdown(pci_dev);
@@ -408,16 +410,6 @@ static void pci_device_shutdown(struct device *dev)
         * continue to do DMA
         */
        pci_disable_device(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