PM: runtime: Redefine pm_runtime_release_supplier()

Instead of passing an extra bool argument to pm_runtime_release_supplier(),
make its callers take care of triggering a runtime-suspend of the
supplier device as needed.

No expected functional impact.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+

Author: rafaeljw

drivers/base/core.c

@@ -486,7 +486,8 @@ static void device_link_release_fn(struct work_struct *work)
 	/* Ensure that all references to the link object have been dropped. */
 	device_link_synchronize_removal();
 
-	pm_runtime_release_supplier(link, true);
+	pm_runtime_release_supplier(link);
+	pm_request_idle(link->supplier);
 
 	put_device(link->consumer);
 	put_device(link->supplier);

drivers/base/power/runtime.c

@@ -308,13 +308,10 @@ static int rpm_get_suppliers(struct device *dev)
 /**
  * pm_runtime_release_supplier - Drop references to device link's supplier.
  * @link: Target device link.
- * @check_idle: Whether or not to check if the supplier device is idle.
  *
- * Drop all runtime PM references associated with @link to its supplier device
- * and if @check_idle is set, check if that device is idle (and so it can be
- * suspended).
+ * Drop all runtime PM references associated with @link to its supplier device.
  */
-void pm_runtime_release_supplier(struct device_link *link, bool check_idle)
+void pm_runtime_release_supplier(struct device_link *link)
 {
 	struct device *supplier = link->supplier;
 
@@ -327,18 +324,18 @@ void pm_runtime_release_supplier(struct device_link *link, bool check_idle)
 	while (refcount_dec_not_one(&link->rpm_active) &&
 	       atomic_read(&supplier->power.usage_count) > 0)
 		pm_runtime_put_noidle(supplier);
-
-	if (check_idle)
-		pm_request_idle(supplier);
 }
 
 static void __rpm_put_suppliers(struct device *dev, bool try_to_suspend)
 {
 	struct device_link *link;
 
 	list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
-				device_links_read_lock_held())
-		pm_runtime_release_supplier(link, try_to_suspend);
+				device_links_read_lock_held()) {
+		pm_runtime_release_supplier(link);
+		if (try_to_suspend)
+			pm_request_idle(link->supplier);
+	}
 }
 
 static void rpm_put_suppliers(struct device *dev)
@@ -1838,7 +1835,8 @@ void pm_runtime_drop_link(struct device_link *link)
 		return;
 
 	pm_runtime_drop_link_count(link->consumer);
-	pm_runtime_release_supplier(link, true);
+	pm_runtime_release_supplier(link);
+	pm_request_idle(link->supplier);
 }
 
 static bool pm_runtime_need_not_resume(struct device *dev)

include/linux/pm_runtime.h

@@ -88,7 +88,7 @@ extern void pm_runtime_get_suppliers(struct device *dev);
 extern void pm_runtime_put_suppliers(struct device *dev);
 extern void pm_runtime_new_link(struct device *dev);
 extern void pm_runtime_drop_link(struct device_link *link);
-extern void pm_runtime_release_supplier(struct device_link *link, bool check_idle);
+extern void pm_runtime_release_supplier(struct device_link *link);
 
 extern int devm_pm_runtime_enable(struct device *dev);
 
@@ -314,8 +314,7 @@ static inline void pm_runtime_get_suppliers(struct device *dev) {}
 static inline void pm_runtime_put_suppliers(struct device *dev) {}
 static inline void pm_runtime_new_link(struct device *dev) {}
 static inline void pm_runtime_drop_link(struct device_link *link) {}
-static inline void pm_runtime_release_supplier(struct device_link *link,
-					       bool check_idle) {}
+static inline void pm_runtime_release_supplier(struct device_link *link) {}
 
 #endif /* !CONFIG_PM */