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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>
This commit is contained in:
Rafael J. Wysocki 2009-02-04 01:59:09 +01:00 committed by Jesse Barnes
parent 144a76bc88
commit 99dadce875
1 changed files with 8 additions and 2 deletions
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10
drivers/pci/pci-driver.c
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@ -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.
*/