From: Rafael J. Wysocki <r...@sisk.pl> Introduce function pm_genpd_present() allowing the caller to check if the given generic PM domain has been initialized.
Signed-off-by: Rafael J. Wysocki <r...@sisk.pl> --- drivers/base/power/domain.c | 22 ++++++++++++++++++++++ include/linux/pm_domain.h | 5 +++++ 2 files changed, 27 insertions(+) Index: linux/drivers/base/power/domain.c =================================================================== --- linux.orig/drivers/base/power/domain.c +++ linux/drivers/base/power/domain.c @@ -2089,3 +2089,25 @@ void pm_genpd_init(struct generic_pm_dom list_add(&genpd->gpd_list_node, &gpd_list); mutex_unlock(&gpd_list_lock); } + +/** + * pm_genpd_present - Check if the given PM domain has been initialized + * @genpd: PM domain to check. + */ +bool pm_genpd_present(struct generic_pm_domain *genpd) +{ + struct generic_pm_domain *gpd = NULL; + + if (IS_ERR_OR_NULL(genpd)) + return false; + + mutex_lock(&gpd_list_lock); + + list_for_each_entry(gpd, &gpd_list, gpd_list_node) + if (gpd == genpd) + break; + + mutex_unlock(&gpd_list_lock); + + return gpd == genpd; +} Index: linux/include/linux/pm_domain.h =================================================================== --- linux.orig/include/linux/pm_domain.h +++ linux/include/linux/pm_domain.h @@ -161,6 +161,7 @@ extern int genpd_attach_cpuidle(struct g extern int genpd_detach_cpuidle(struct generic_pm_domain *genpd); extern void pm_genpd_init(struct generic_pm_domain *genpd, struct dev_power_governor *gov, bool is_off); +extern bool pm_genpd_present(struct generic_pm_domain *genpd); extern int pm_genpd_poweron(struct generic_pm_domain *genpd); extern int pm_genpd_name_poweron(const char *domain_name); @@ -239,6 +240,10 @@ static inline void pm_genpd_init(struct struct dev_power_governor *gov, bool is_off) { } +static inline bool pm_genpd_present(struct generic_pm_domain *genpd) +{ + return false; +} static inline int pm_genpd_poweron(struct generic_pm_domain *genpd) { return -ENOSYS; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/