device_links_read_unlock(idx);
}
+static void device_link_rpm_prepare(struct device *consumer,
+ struct device *supplier)
+{
+ pm_runtime_new_link(consumer);
+ /*
+ * If the link is being added by the consumer driver at probe time,
+ * balance the decrementation of the supplier's runtime PM usage counter
+ * after consumer probe in driver_probe_device().
+ */
+ if (consumer->links.status == DL_DEV_PROBING)
+ pm_runtime_get_noresume(supplier);
+}
+
/**
* device_link_add - Create a link between two devices.
* @consumer: Consumer end of the link.
struct device *supplier, u32 flags)
{
struct device_link *link;
- bool rpm_put_supplier = false;
if (!consumer || !supplier ||
(flags & DL_FLAG_STATELESS &&
pm_runtime_put_noidle(supplier);
return NULL;
}
- rpm_put_supplier = true;
}
device_links_write_lock();
if (flags & DL_FLAG_AUTOREMOVE_SUPPLIER)
link->flags |= DL_FLAG_AUTOREMOVE_SUPPLIER;
+ if (flags & DL_FLAG_PM_RUNTIME) {
+ if (!(link->flags & DL_FLAG_PM_RUNTIME)) {
+ device_link_rpm_prepare(consumer, supplier);
+ link->flags |= DL_FLAG_PM_RUNTIME;
+ }
+ if (flags & DL_FLAG_RPM_ACTIVE)
+ refcount_inc(&link->rpm_active);
+ }
+
kref_get(&link->kref);
goto out;
}
if (!link)
goto out;
+ refcount_set(&link->rpm_active, 1);
+
if (flags & DL_FLAG_PM_RUNTIME) {
- if (flags & DL_FLAG_RPM_ACTIVE) {
- link->rpm_active = true;
- rpm_put_supplier = false;
- }
- pm_runtime_new_link(consumer);
- /*
- * If the link is being added by the consumer driver at probe
- * time, balance the decrementation of the supplier's runtime PM
- * usage counter after consumer probe in driver_probe_device().
- */
- if (consumer->links.status == DL_DEV_PROBING)
- pm_runtime_get_noresume(supplier);
+ if (flags & DL_FLAG_RPM_ACTIVE)
+ refcount_inc(&link->rpm_active);
+
+ device_link_rpm_prepare(consumer, supplier);
}
+
get_device(supplier);
link->supplier = supplier;
INIT_LIST_HEAD(&link->s_node);
device_pm_unlock();
device_links_write_unlock();
- if (rpm_put_supplier)
+ if ((flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) && !link)
pm_runtime_put(supplier);
return link;
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) {
int retval;
- if (!(link->flags & DL_FLAG_PM_RUNTIME))
- continue;
-
- if (READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND ||
- link->rpm_active)
+ if (!(link->flags & DL_FLAG_PM_RUNTIME) ||
+ READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND)
continue;
retval = pm_runtime_get_sync(link->supplier);
pm_runtime_put_noidle(link->supplier);
return retval;
}
- link->rpm_active = true;
+ refcount_inc(&link->rpm_active);
}
return 0;
}
{
struct device_link *link;
- list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
- if (link->rpm_active &&
- READ_ONCE(link->status) != DL_STATE_SUPPLIER_UNBIND) {
+ list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) {
+ if (READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND)
+ continue;
+
+ while (refcount_dec_not_one(&link->rpm_active))
pm_runtime_put(link->supplier);
- link->rpm_active = false;
- }
+ }
}
/**
*
* Check links from this device to any consumers and if any of them have active
* runtime PM references to the device, drop the usage counter of the device
- * (once per link).
+ * (as many times as needed).
*
* Links with the DL_FLAG_STATELESS flag set are ignored.
*
if (link->flags & DL_FLAG_STATELESS)
continue;
- if (link->rpm_active) {
+ while (refcount_dec_not_one(&link->rpm_active))
pm_runtime_put_noidle(dev);
- link->rpm_active = false;
- }
}
device_links_read_unlock(idx);