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From:   "Rafael J. Wysocki" <rjw@rjwysocki.net>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Linux PM <linux-pm@vger.kernel.org>
Subject: [PATCH] PK: runtime: Redefine pm_runtime_release_supplier()
Date:   Mon, 27 Jun 2022 20:42:18 +0200
Message-ID: <2653259.mvXUDI8C0e@kreacher>
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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>
---
 drivers/base/core.c          |    3 ++-
 drivers/base/power/runtime.c |   20 +++++++++-----------
 include/linux/pm_runtime.h   |    5 ++---
 3 files changed, 13 insertions(+), 15 deletions(-)

Index: linux-pm/drivers/base/power/runtime.c
===================================================================
--- linux-pm.orig/drivers/base/power/runtime.c
+++ linux-pm/drivers/base/power/runtime.c
@@ -308,13 +308,10 @@ static int rpm_get_suppliers(struct devi
 /**
  * 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;
 
@@ -327,9 +324,6 @@ void pm_runtime_release_supplier(struct
 	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)
@@ -337,8 +331,11 @@ static void __rpm_put_suppliers(struct d
 	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_
 		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)
Index: linux-pm/include/linux/pm_runtime.h
===================================================================
--- linux-pm.orig/include/linux/pm_runtime.h
+++ linux-pm/include/linux/pm_runtime.h
@@ -88,7 +88,7 @@ extern void pm_runtime_get_suppliers(str
 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_suppli
 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 */
 
Index: linux-pm/drivers/base/core.c
===================================================================
--- linux-pm.orig/drivers/base/core.c
+++ linux-pm/drivers/base/core.c
@@ -486,7 +486,8 @@ static void device_link_release_fn(struc
 	/* 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);