From: Mika Westerberg Date: Mon, 27 Jul 2015 15:03:57 +0000 (+0300) Subject: ACPI / PM: Attach ACPI power domain only once X-Git-Tag: omap-for-v4.3/fixes-rc1~93^2~65 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=712e960f0ee9;p=pandora-kernel.git ACPI / PM: Attach ACPI power domain only once Some devices, like MFD subdevices, share a single ACPI companion device so that they are able to access their resources and children. However, currently all these subdevices are attached to the ACPI power domain and this might cause that the power methods for the companion device get called more than once. In order to solve this we attach the ACPI power domain only to the first physical device that is bound to the ACPI companion device. In case of MFD devices, this is the parent MFD device itself. Acked-by: Rafael J. Wysocki Signed-off-by: Mika Westerberg Signed-off-by: Andy Shevchenko Signed-off-by: Lee Jones --- diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 717afcdb5f4a..08dc3ec7e892 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -1123,6 +1123,14 @@ 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) { Reading git-diff-tree failed