kobject: introduce kobj_completion (eee03164) · Commits · 戴 / test

include/linux/kobj_completion.h

0 → 100644

+18 −0

Original line number	Diff line number	Diff line
		#ifndef _KOBJ_COMPLETION_H_
		#define _KOBJ_COMPLETION_H_

		#include <linux/kobject.h>
		#include <linux/completion.h>

		struct kobj_completion {
		struct kobject kc_kobj;
		struct completion kc_unregister;
		};

		#define kobj_to_kobj_completion(kobj) \
		container_of(kobj, struct kobj_completion, kc_kobj)

		void kobj_completion_init(struct kobj_completion kc, struct kobj_type ktype);
		void kobj_completion_release(struct kobject *kobj);
		void kobj_completion_del_and_wait(struct kobj_completion *kc);
		#endif /* _KOBJ_COMPLETION_H_ */

lib/kobject.c

+50 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		*/

		#include <linux/kobject.h>
		#include <linux/kobj_completion.h>
		#include <linux/string.h>
		#include <linux/export.h>
		#include <linux/stat.h>
		@@ -749,6 +750,55 @@ const struct sysfs_ops kobj_sysfs_ops = {
		.store = kobj_attr_store,
		};

		/**
		* kobj_completion_init - initialize a kobj_completion object.
		* @kc: kobj_completion
		* @ktype: type of kobject to initialize
		*
		* kobj_completion structures can be embedded within structures with different
		* lifetime rules. During the release of the enclosing object, we can
		* wait on the release of the kobject so that we don't free it while it's
		* still busy.
		*/
		void kobj_completion_init(struct kobj_completion kc, struct kobj_type ktype)
		{
		init_completion(&kc->kc_unregister);
		kobject_init(&kc->kc_kobj, ktype);
		}
		EXPORT_SYMBOL_GPL(kobj_completion_init);

		/**
		* kobj_completion_release - release a kobj_completion object
		* @kobj: kobject embedded in kobj_completion
		*
		* Used with kobject_release to notify waiters that the kobject has been
		* released.
		*/
		void kobj_completion_release(struct kobject *kobj)
		{
		struct kobj_completion *kc = kobj_to_kobj_completion(kobj);
		complete(&kc->kc_unregister);
		}
		EXPORT_SYMBOL_GPL(kobj_completion_release);

		/**
		* kobj_completion_del_and_wait - release the kobject and wait for it
		* @kc: kobj_completion object to release
		*
		* Delete the kobject from sysfs and drop the reference count. Then wait
		* until any other outstanding references are also dropped. This routine
		* is only necessary once other references may have been taken on the
		* kobject. Typically this happens when the kobject has been published
		* to sysfs via kobject_add.
		*/
		void kobj_completion_del_and_wait(struct kobj_completion *kc)
		{
		kobject_del(&kc->kc_kobj);
		kobject_put(&kc->kc_kobj);
		wait_for_completion(&kc->kc_unregister);
		}
		EXPORT_SYMBOL_GPL(kobj_completion_del_and_wait);

		/**
		* kset_register - initialize and add a kset.
		* @k: kset.

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