From 919b7308fcc452cd4e282bab389c33384a9f3790 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Wed, 9 May 2018 12:17:52 +0200 Subject: PM / Domains: Allow a better error handling of dev_pm_domain_attach() The callers of dev_pm_domain_attach() currently checks the returned error code for -EPROBE_DEFER and needs to ignore other error codes. This is an unnecessary limitation, which also leads to a rather strange behaviour in the error path. Address this limitation, by changing the return codes from acpi_dev_pm_attach() and genpd_dev_pm_attach(). More precisely, let them return 0, when no PM domain is needed for the device and then return 1, in case the device was successfully attached to its PM domain. In this way, dev_pm_domain_attach(), gets a better understanding of what happens in the attach attempts and also allowing its caller to better act on real errors codes. Signed-off-by: Ulf Hansson Signed-off-by: Rafael J. Wysocki --- drivers/acpi/device_pm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/acpi/device_pm.c') diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index d00630016176..a7c2673ffd36 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -1257,7 +1257,7 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on) struct acpi_device *adev = ACPI_COMPANION(dev); if (!adev) - return -ENODEV; + return 0; /* * Only attach the power domain to the first device if the @@ -1265,7 +1265,7 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on) * management twice. */ if (!acpi_device_is_first_physical_node(adev, dev)) - return -EBUSY; + return 0; acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); dev_pm_domain_set(dev, &acpi_general_pm_domain); @@ -1275,7 +1275,7 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on) } dev->pm_domain->detach = acpi_dev_pm_detach; - return 0; + return 1; } EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); #endif /* CONFIG_PM */ -- cgit