From: Rafael J. Wysocki Date: Wed, 4 Feb 2009 00:59:09 +0000 (+0100) Subject: PCI PM: Fix saving of device state in pci_legacy_suspend X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=99dadce8756bf08f5f8baf749533d044f6b3ff25;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Reported-by: Benjamin Herrenschmidt Acked-by: Linus Torvalds Signed-off-by: Jesse Barnes --- 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. */