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author | Rafael J. Wysocki <rjw@sisk.pl> | 2009-01-07 13:03:42 +0100 |
---|---|---|
committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-01-07 11:14:40 -0800 |
commit | fa58d305d9925b01830e535896a7227a868a9e15 (patch) | |
tree | 6b0509663958c9fc6c3b201e6a3b061af784ffa9 /drivers/pci/pci-driver.c | |
parent | c9b9972b3c88272be02d971346285d1c67fbb95f (diff) | |
download | kernel_samsung_smdk4412-fa58d305d9925b01830e535896a7227a868a9e15.zip kernel_samsung_smdk4412-fa58d305d9925b01830e535896a7227a868a9e15.tar.gz kernel_samsung_smdk4412-fa58d305d9925b01830e535896a7227a868a9e15.tar.bz2 |
PCI PM: Add suspend counterpart of pci_reenable_device
PCI devices without drivers are not disabled during suspend and
hibernation, but they are enabled during resume, with the help of
pci_reenable_device(), so there is an unbalanced execution of
pcibios_enable_device() in the resume code path.
To correct this introduce function pci_disable_enabled_device()
that will disable the argument device, if it is enabled when the
function is being run, without updating the device's pci_dev
structure and use it in the suspend code path to balance the
pci_reenable_device() executed during resume.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci-driver.c')
-rw-r--r-- | drivers/pci/pci-driver.c | 35 |
1 files changed, 30 insertions, 5 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 23bdf64..57cb001 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -324,9 +324,19 @@ static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) /* * Default "suspend" method for devices that have no driver provided suspend, - * or not even a driver at all. + * or not even a driver at all (first part). + */ +static void pci_default_pm_suspend_early(struct pci_dev *pci_dev) +{ + /* If device is enabled at this point, disable it */ + pci_disable_enabled_device(pci_dev); +} + +/* + * Default "suspend" method for devices that have no driver provided suspend, + * or not even a driver at all (second part). */ -static void pci_default_pm_suspend(struct pci_dev *pci_dev) +static void pci_default_pm_suspend_late(struct pci_dev *pci_dev) { pci_save_state(pci_dev); /* @@ -377,7 +387,11 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state) i = drv->suspend(pci_dev, state); suspend_report_result(drv->suspend, i); } else { - pci_default_pm_suspend(pci_dev); + /* + * For compatibility with existing code with legacy PM support + * don't call pci_default_pm_suspend_early() here. + */ + pci_default_pm_suspend_late(pci_dev); } return i; } @@ -455,7 +469,10 @@ static int pci_pm_suspend(struct device *dev) } } else if (pci_has_legacy_pm_support(pci_dev)) { error = pci_legacy_suspend(dev, PMSG_SUSPEND); + } else { + pci_default_pm_suspend_early(pci_dev); } + pci_fixup_device(pci_fixup_suspend, pci_dev); return error; @@ -475,7 +492,7 @@ static int pci_pm_suspend_noirq(struct device *dev) } else if (pci_has_legacy_pm_support(pci_dev)) { error = pci_legacy_suspend_late(dev, PMSG_SUSPEND); } else { - pci_default_pm_suspend(pci_dev); + pci_default_pm_suspend_late(pci_dev); } return error; @@ -546,6 +563,8 @@ static int pci_pm_freeze(struct device *dev) } else if (pci_has_legacy_pm_support(pci_dev)) { error = pci_legacy_suspend(dev, PMSG_FREEZE); pci_fixup_device(pci_fixup_suspend, pci_dev); + } else { + pci_default_pm_suspend_early(pci_dev); } return error; @@ -565,7 +584,7 @@ static int pci_pm_freeze_noirq(struct device *dev) } else if (pci_has_legacy_pm_support(pci_dev)) { error = pci_legacy_suspend_late(dev, PMSG_FREEZE); } else { - pci_default_pm_suspend(pci_dev); + pci_default_pm_suspend_late(pci_dev); } return error; @@ -583,6 +602,8 @@ static int pci_pm_thaw(struct device *dev) } else if (pci_has_legacy_pm_support(pci_dev)) { pci_fixup_device(pci_fixup_resume, pci_dev); error = pci_legacy_resume(dev); + } else { + pci_default_pm_resume_late(pci_dev); } return error; @@ -600,6 +621,8 @@ static int pci_pm_thaw_noirq(struct device *dev) } else if (pci_has_legacy_pm_support(pci_dev)) { pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev)); error = pci_legacy_resume_early(dev); + } else { + pci_default_pm_resume_early(pci_dev); } return error; @@ -618,6 +641,8 @@ static int pci_pm_poweroff(struct device *dev) } } else if (pci_has_legacy_pm_support(pci_dev)) { error = pci_legacy_suspend(dev, PMSG_HIBERNATE); + } else { + pci_default_pm_suspend_early(pci_dev); } pci_fixup_device(pci_fixup_suspend, pci_dev); |