From 3487972d7fa6c5143951436ada5933dcf0ec659d Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 7 Dec 2017 02:41:18 +0100 Subject: [PATCH] PM / sleep: Avoid excess pm_runtime_enable() calls in device_resume() Middle-layer code doing suspend-time optimizations for devices with the DPM_FLAG_SMART_SUSPEND flag set (currently, the PCI bus type and the ACPI PM domain) needs to make the core skip ->thaw_early and ->thaw callbacks for those devices in some cases and it sets the power.direct_complete flag for them for this purpose. However, it turns out that setting power.direct_complete outside of the PM core is a bad idea as it triggers an excess invocation of pm_runtime_enable() in device_resume(). For this reason, provide a helper to clear power.is_late_suspended and power.is_suspended to be invoked by the middle-layer code in question instead of setting power.direct_complete and make that code call the new helper. Fixes: c4b65157aeef (PCI / PM: Take SMART_SUSPEND driver flag into account) Fixes: 05087360fd7a (ACPI / PM: Take SMART_SUSPEND driver flag into account) Signed-off-by: Rafael J. Wysocki Reviewed-by: Ulf Hansson Acked-by: Bjorn Helgaas --- drivers/acpi/device_pm.c | 2 +- drivers/base/power/main.c | 15 +++++++++++++++ drivers/pci/pci-driver.c | 2 +- include/linux/pm.h | 1 + 4 files changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index e4ffaeec9ec2..a4c8ad98560d 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -1138,7 +1138,7 @@ int acpi_subsys_thaw_noirq(struct device *dev) * skip all of the subsequent "thaw" callbacks for the device. */ if (dev_pm_smart_suspend_and_suspended(dev)) { - dev->power.direct_complete = true; + dev_pm_skip_next_resume_phases(dev); return 0; } diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index db2f04415927..08744b572af6 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -525,6 +525,21 @@ static void dpm_watchdog_clear(struct dpm_watchdog *wd) /*------------------------- Resume routines -------------------------*/ +/** + * dev_pm_skip_next_resume_phases - Skip next system resume phases for device. + * @dev: Target device. + * + * Make the core skip the "early resume" and "resume" phases for @dev. + * + * This function can be called by middle-layer code during the "noirq" phase of + * system resume if necessary, but not by device drivers. + */ +void dev_pm_skip_next_resume_phases(struct device *dev) +{ + dev->power.is_late_suspended = false; + dev->power.is_suspended = false; +} + /** * device_resume_noirq - Execute a "noirq resume" callback for given device. * @dev: Device to handle. diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 7f47bb72bf30..945099d49f8f 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -999,7 +999,7 @@ static int pci_pm_thaw_noirq(struct device *dev) * the subsequent "thaw" callbacks for the device. */ if (dev_pm_smart_suspend_and_suspended(dev)) { - dev->power.direct_complete = true; + dev_pm_skip_next_resume_phases(dev); return 0; } diff --git a/include/linux/pm.h b/include/linux/pm.h index 65d39115f06d..492ed473ba7e 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -765,6 +765,7 @@ extern int pm_generic_poweroff_late(struct device *dev); extern int pm_generic_poweroff(struct device *dev); extern void pm_generic_complete(struct device *dev); +extern void dev_pm_skip_next_resume_phases(struct device *dev); extern bool dev_pm_smart_suspend_and_suspended(struct device *dev); #else /* !CONFIG_PM_SLEEP */ -- 2.30.2