From: Rafael J. Wysocki <rjw@xxxxxxx> Suspend to RAM is reported to break on some machines as a result of attempting to put one of driverless PCI devices into a low power state. Avoid that by not attepmting to power manage driverless devices during suspend. Fix up pci_pm_poweroff() after a previous incomplete fix for the same thing during hibernation. This patch is reported to fix the regression from 2.6.28 tracked as http://bugzilla.kernel.org/show_bug.cgi?id=12605 Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> Reported-and-tested-by: Eric Sesterhenn <snakebyte@xxxxxx> --- drivers/pci/pci-driver.c | 27 ++++++++++++--------------- 1 file changed, 12 insertions(+), 15 deletions(-) Index: linux-2.6/drivers/pci/pci-driver.c =================================================================== --- linux-2.6.orig/drivers/pci/pci-driver.c +++ linux-2.6/drivers/pci/pci-driver.c @@ -445,11 +445,11 @@ static void pci_pm_default_suspend_gener pci_save_state(pci_dev); } -static void pci_pm_default_suspend(struct pci_dev *pci_dev) +static void pci_pm_default_suspend(struct pci_dev *pci_dev, bool prepare) { pci_pm_default_suspend_generic(pci_dev); - if (!pci_is_bridge(pci_dev)) + if (prepare && !pci_is_bridge(pci_dev)) pci_prepare_to_sleep(pci_dev); pci_fixup_device(pci_fixup_suspend, pci_dev); @@ -497,19 +497,19 @@ static void pci_pm_complete(struct devic static int pci_pm_suspend(struct device *dev) { struct pci_dev *pci_dev = to_pci_dev(dev); - struct device_driver *drv = dev->driver; + struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int error = 0; if (pci_has_legacy_pm_support(pci_dev)) return pci_legacy_suspend(dev, PMSG_SUSPEND); - if (drv && drv->pm && drv->pm->suspend) { - error = drv->pm->suspend(dev); - suspend_report_result(drv->pm->suspend, error); + if (pm && pm->suspend) { + error = pm->suspend(dev); + suspend_report_result(pm->suspend, error); } if (!error) - pci_pm_default_suspend(pci_dev); + pci_pm_default_suspend(pci_dev, !!pm); return error; } @@ -663,22 +663,19 @@ static int pci_pm_thaw(struct device *de static int pci_pm_poweroff(struct device *dev) { struct pci_dev *pci_dev = to_pci_dev(dev); - struct device_driver *drv = dev->driver; + struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int error = 0; if (pci_has_legacy_pm_support(pci_dev)) return pci_legacy_suspend(dev, PMSG_HIBERNATE); - if (!drv || !drv->pm) - return 0; - - if (drv->pm->poweroff) { - error = drv->pm->poweroff(dev); - suspend_report_result(drv->pm->poweroff, error); + if (pm && pm->poweroff) { + error = pm->poweroff(dev); + suspend_report_result(pm->poweroff, error); } if (!error) - pci_pm_default_suspend(pci_dev); + pci_pm_default_suspend(pci_dev, !!pm); return error; } _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
