diff options
| author | Rafael J. Wysocki <rjw@sisk.pl> | 2009-02-04 01:59:09 +0100 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-02-05 02:21:08 +0100 |
| commit | 99dadce8756bf08f5f8baf749533d044f6b3ff25 (patch) | |
| tree | 7593c043681c463382fafb22737e4f4a7f52f00b | |
| parent | PCI PM: Check if the state has been saved before trying to restore it (diff) | |
| download | linux-99dadce8756bf08f5f8baf749533d044f6b3ff25.tar.xz linux-99dadce8756bf08f5f8baf749533d044f6b3ff25.zip | |
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>
| -rw-r--r-- | drivers/pci/pci-driver.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 6613bef25bf2..fdb6a697e05a 100644 --- 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. */ |