linux-kernel - [PATCH 01/21] driver core: add local subsys_get and subsys

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Date:   Wed,  8 Feb 2023 12:13:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH 01/21] driver core: add local subsys_get and subsys_put functions

We need to control the reference count of the subsys private structure
instead of directly manipulating the kset reference count of it, so wrap
that logic up in a subsys_get() and subsys_put() function to make it more
obvious as to what is happening.

Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/base.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/base/base.h b/drivers/base/base.h
index 0e806f641079..9e06c18c7a64 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -57,6 +57,19 @@ struct subsys_private {
 };
 #define to_subsys_private(obj) container_of_const(obj, struct subsys_private, subsys.kobj)
 
+static inline struct subsys_private *subsys_get(struct subsys_private *sp)
+{
+	if (sp)
+		kset_get(&sp->subsys);
+	return sp;
+}
+
+static inline void subsys_put(struct subsys_private *sp)
+{
+	if (sp)
+		kset_put(&sp->subsys);
+}
+
 struct driver_private {
 	struct kobject kobj;
 	struct klist klist_devices;
-- 
2.39.1