From: Alexander Aring <alex.aring@xxxxxxxxx>
This patch adds function pm_genpd_exit for undo a pm_genpd_init. This
is useful for multiple power domains while probing. If the probing fails
after one pm_genpd_init was called we need to undo all previous
registrations of generic pm domains inside the gpd_list list.
There is a check on IS_ERR_OR_NULL(genpd) which is useful to check again
registered power domains and not registered domains, the driver can use
this mechanism to have an array with registered and non-registered power
domains, where non-registered power domains are NULL.
Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Cc: Kevin Hilman <khilman@xxxxxxxxxx>
Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---
drivers/base/power/domain.c | 22 ++++++++++++++++++++++
include/linux/pm_domain.h | 4 ++++
2 files changed, 26 insertions(+)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 167418e..e7aca27 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1509,6 +1509,28 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
}
EXPORT_SYMBOL_GPL(pm_genpd_init);
+/**
+ * pm_genpd_exit - Uninitialize a generic I/O PM domain object.
+ * @genpd: PM domain object to uninitialize.
+ */
+void pm_genpd_exit(struct generic_pm_domain *genpd)
+{
+ if (IS_ERR_OR_NULL(genpd))
+ return;
+
+ /* check if domain is still in registered inside the pm subsystem */
+ WARN_ON_ONCE(!list_empty(&genpd->master_links) ||
+ !list_empty(&genpd->slave_links) ||
+ !list_empty(&genpd->dev_list));
+
+ mutex_lock(&gpd_list_lock);
+ list_del(&genpd->gpd_list_node);
+ mutex_unlock(&gpd_list_lock);
+
+ mutex_destroy(&genpd->lock);
+}
+EXPORT_SYMBOL_GPL(pm_genpd_exit);
+
#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
/*
* Device Tree based PM domain providers.
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index ba4ced3..5020b36 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -123,6 +123,7 @@ extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *target);
extern void pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off);
+extern void pm_genpd_exit(struct generic_pm_domain *genpd);
extern struct dev_power_governor simple_qos_governor;
extern struct dev_power_governor pm_domain_always_on_gov;
@@ -161,6 +162,9 @@ static inline void pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off)
{
}
+static inline void pm_genpd_exit(struct generic_pm_domain *genpd)
+{
+}
#endif
static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
--
2.6.2
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