PCI PM: Fix saving of device state in pci_legacy_suspend

Make pci_legacy_suspend() save the state of the device if it is
in PCI_UNKNOWN after its suspend callback has run and warn only if
the power state of the device has been changed by its suspend
callback.

Also, use WARN_ONCE(), which is more useful, in pci_legacy_suspend(),
so that the name of the offending function is printed.

Additionally, remove the unnecessary line of code setting
pci_dev->state_saved.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reported-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 6613bef..fdb6a69 100644 (file)
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -355,6 +355,8 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state)
        int i = 0;
 
        if (drv && drv->suspend) {
+               pci_power_t prev = pci_dev->current_state;
+
                pci_dev->state_saved = false;
 
                i = drv->suspend(pci_dev, state);
@@ -365,12 +367,16 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state)
                if (pci_dev->state_saved)
                        goto Fixup;
 
-               if (WARN_ON_ONCE(pci_dev->current_state != PCI_D0))
+               if (pci_dev->current_state != PCI_D0
+                   && pci_dev->current_state != PCI_UNKNOWN) {
+                       WARN_ONCE(pci_dev->current_state != prev,
+                               "PCI PM: Device state not saved by %pF\n",
+                               drv->suspend);
                        goto Fixup;
+               }
        }
 
        pci_save_state(pci_dev);
-       pci_dev->state_saved = true;
        /*
         * This is for compatibility with existing code with legacy PM support.
         */