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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2009-02-04 01:56:14 +0100 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-02-04 17:20:09 -0800 |
| commit | ddb7c9d29fac34626aef2af9f19787a888e4ca9c (patch) | |
| tree | 9f56f777604d4ccc5395f93972e7a0d0618ba249 /drivers/pci/pci-driver.c | |
| parent | 97c44836cdec1ea713a15d84098a1a908157e68f (diff) | |
| download | lwn-ddb7c9d29fac34626aef2af9f19787a888e4ca9c.tar.gz lwn-ddb7c9d29fac34626aef2af9f19787a888e4ca9c.zip | |
PCI PM: Fix handling of devices without drivers
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@sisk.pl>
Reported-and-tested-by: Eric Sesterhenn <snakebyte@gmx.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci-driver.c')
| -rw-r--r-- | drivers/pci/pci-driver.c | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index ab1d615425a8..6613bef25bf2 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -445,11 +445,11 @@ static void pci_pm_default_suspend_generic(struct pci_dev *pci_dev) 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 device *dev) 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 *dev) 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; } |