PM / domains: factor out code to get the generic PM domain from a struct device

The PM domain code contains two methods to get the generic PM domain
for a struct device.  One is dev_to_genpd() which is only safe when
we know for certain that the device has a generic PM domain attached.
The other is coded into genpd_dev_pm_detach() which ensures that the
PM domain in the struct device is a generic PM domain (and so is safer).

This commit factors out the safer version, documents it, and hides the
unsafe dev_to_genpd().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 080e778118ba..681ccb053f72 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -127,7 +127,7 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
         return to_gpd_data(dev->power.subsys_data->domain_data);
 }
 
-extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
+extern struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev);
 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
                                  struct device *dev,
                                  struct gpd_timing_data *td);
@@ -163,9 +163,9 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 {
         return ERR_PTR(-ENOSYS);
 }
-static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
+static inline struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
 {
-        return ERR_PTR(-ENOSYS);
+        return NULL;
 }
 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
                                         struct device *dev,