linux-kernel - [PATCH v2 01/10] kobject: introduce kobject_del_and

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Date:   Sun, 19 Mar 2023 16:41:24 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Yangtao Li <frank.li@...o.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 01/10] kobject: introduce kobject_del_and_put()

There are plenty of using kobject_del() and kobject_put() together
in the kernel tree. This patch wraps these two calls in a single helper.

Signed-off-by: Yangtao Li <frank.li@...o.com>
---
v2:
-add kobject_del_and_put() users
 include/linux/kobject.h |  1 +
 lib/kobject.c           | 17 +++++++++++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index bdab370a24f4..782d4bd119f8 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -111,6 +111,7 @@ extern struct kobject *kobject_get(struct kobject *kobj);
 extern struct kobject * __must_check kobject_get_unless_zero(
 						struct kobject *kobj);
 extern void kobject_put(struct kobject *kobj);
+extern void kobject_del_and_put(struct kobject *kobj);
 
 extern const void *kobject_namespace(const struct kobject *kobj);
 extern void kobject_get_ownership(const struct kobject *kobj,
diff --git a/lib/kobject.c b/lib/kobject.c
index 6e2f0bee3560..8c0293e37214 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -731,6 +731,20 @@ void kobject_put(struct kobject *kobj)
 }
 EXPORT_SYMBOL(kobject_put);
 
+/**
+ * kobject_del_and_put() - Delete kobject.
+ * @kobj: object.
+ *
+ * Unlink kobject from hierarchy and decrement the refcount.
+ * If refcount is 0, call kobject_cleanup().
+ */
+void kobject_del_and_put(struct kobject *kobj)
+{
+	kobject_del(kobj);
+	kobject_put(kobj);
+}
+EXPORT_SYMBOL_GPL(kobject_del_and_put);
+
 static void dynamic_kobj_release(struct kobject *kobj)
 {
 	pr_debug("kobject: (%p): %s\n", kobj, __func__);
@@ -874,8 +888,7 @@ void kset_unregister(struct kset *k)
 {
 	if (!k)
 		return;
-	kobject_del(&k->kobj);
-	kobject_put(&k->kobj);
+	kobject_del_and_put(&k->kobj);
 }
 EXPORT_SYMBOL(kset_unregister);
 
-- 
2.35.1