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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-09-01 04:38:43 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-09-01 04:38:43 +0300 |
| commit | ef5f5de069bd9081a7ddf6998269b58fc65e27ef (patch) | |
| tree | 21d53507543248f81725cbc486625f77562f935d /drivers/acpi/device_pm.c | |
| parent | 73990fc810bf84c5338d9596f8af8d70fe90ac72 (diff) | |
| parent | e91a398c31cef2d51786642e372c503cd43fba90 (diff) | |
| download | linux-ef5f5de069bd9081a7ddf6998269b58fc65e27ef.tar.xz | |
Merge branch 'acpi-pm'
* acpi-pm:
ACPI / bus: Move duplicate code to a separate new function
mfd: Add support for Intel Sunrisepoint LPSS devices
dmaengine: add a driver for Intel integrated DMA 64-bit
mfd: make mfd_remove_devices() iterate in reverse order
driver core: implement device_for_each_child_reverse()
klist: implement klist_prev()
Driver core: wakeup the parent device before trying probe
ACPI / PM: Attach ACPI power domain only once
PM / QoS: Make it possible to expose device latency tolerance to userspace
ACPI / PM: Update the copyright notice and description of power.c
Diffstat (limited to 'drivers/acpi/device_pm.c')
| -rw-r--r-- | drivers/acpi/device_pm.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index da0867899d10..4806b7f856c4 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -1119,6 +1119,14 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on) if (dev->pm_domain) return -EEXIST; + /* + * Only attach the power domain to the first device if the + * companion is shared by multiple. This is to prevent doing power + * management twice. + */ + if (!acpi_device_is_first_physical_node(adev, dev)) + return -EBUSY; + acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); dev->pm_domain = &acpi_general_pm_domain; if (power_on) { |