Release 4.9 lib/kobject.c

Directory: lib
/*
 * kobject.c - library routines for handling generic kernel objects
 *
 * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
 * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (c) 2006-2007 Novell Inc.
 *
 * This file is released under the GPLv2.
 *
 *
 * Please see the file Documentation/kobject.txt for critical information
 * about using the kobject interface.
 */

#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/random.h>

/**
 * kobject_namespace - return @kobj's namespace tag
 * @kobj: kobject in question
 *
 * Returns namespace tag of @kobj if its parent has namespace ops enabled
 * and thus @kobj should have a namespace tag associated with it.  Returns
 * %NULL otherwise.
 */


const void *kobject_namespace(struct kobject *kobj)
{
	const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj);

	if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE)
		return NULL;

	return kobj->ktype->namespace(kobj);
}

Contributors
Person Tokens Prop Commits CommitProp
tejun heo tejun heo 46 97.87% 1 50.00%
linus torvalds linus torvalds 1 2.13% 1 50.00%
Total 47 100.00% 2 100.00%

/*
 * populate_dir - populate directory with attributes.
 * @kobj: object we're working on.
 *
 * Most subsystems have a set of default attributes that are associated
 * with an object that registers with them.  This is a helper called during
 * object registration that loops through the default attributes of the
 * subsystem and creates attributes files for them in sysfs.
 */


static int populate_dir(struct kobject *kobj)
{
	struct kobj_type *t = get_ktype(kobj);
	struct attribute *attr;
	int error = 0;
	int i;

	if (t && t->default_attrs) {
		for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
			error = sysfs_create_file(kobj, attr);
			if (error)
				break;
		}
	}
	return error;
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mochel patrick mochel 53 62.35% 4 57.14%
greg kroah-hartman greg kroah-hartman 30 35.29% 2 28.57%
mika kukkonen mika kukkonen 2 2.35% 1 14.29%
Total 85 100.00% 7 100.00%



static int create_dir(struct kobject *kobj)
{
	const struct kobj_ns_type_operations *ops;
	int error;

	error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
	if (error)
		return error;

	error = populate_dir(kobj);
	if (error) {
		sysfs_remove_dir(kobj);
		return error;
	}

	/*
         * @kobj->sd may be deleted by an ancestor going away.  Hold an
         * extra reference so that it stays until @kobj is gone.
         */
	sysfs_get(kobj->sd);

	/*
         * If @kobj has ns_ops, its children need to be filtered based on
         * their namespace tags.  Enable namespace support on @kobj->sd.
         */
	ops = kobj_child_ns_ops(kobj);
	if (ops) {
		BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE);
		BUG_ON(ops->type >= KOBJ_NS_TYPES);
		BUG_ON(!kobj_ns_type_registered(ops->type));

		sysfs_enable_ns(kobj->sd);
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
tejun heo tejun heo 78 64.46% 4 66.67%
greg kroah-hartman greg kroah-hartman 43 35.54% 2 33.33%
Total 121 100.00% 6 100.00%



static int get_kobj_path_length(struct kobject *kobj)
{
	int length = 1;
	struct kobject *parent = kobj;

	/* walk up the ancestors until we hit the one pointing to the
         * root.
         * Add 1 to strlen for leading '/' of each level.
         */
	do {
		if (kobject_name(parent) == NULL)
			return 0;
		length += strlen(kobject_name(parent)) + 1;
		parent = parent->parent;
	} while (parent);
	return length;
}

Contributors
Person Tokens Prop Commits CommitProp
greg kroah-hartman greg kroah-hartman 50 76.92% 2 50.00%
chuck ebbert chuck ebbert 12 18.46% 1 25.00%
patrick mochel patrick mochel 3 4.62% 1 25.00%
Total 65 100.00% 4 100.00%



static void fill_kobj_path(struct kobject *kobj, char *path, int length)
{
	struct kobject *parent;

	--length;
	for (parent = kobj; parent; parent = parent->parent) {
		int cur = strlen(kobject_name(parent));
		/* back up enough to print this name with '/' */
		length -= cur;
		strncpy(path + length, kobject_name(parent), cur);
		*(path + --length) = '/';
	}

	pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
		 kobj, __func__, path);
}

Contributors
Person Tokens Prop Commits CommitProp
greg kroah-hartman greg kroah-hartman 91 92.86% 2 50.00%
patrick mochel patrick mochel 6 6.12% 1 25.00%
harvey harrison harvey harrison 1 1.02% 1 25.00%
Total 98 100.00% 4 100.00%

/**
 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
 *
 * @kobj:       kobject in question, with which to build the path
 * @gfp_mask:   the allocation type used to allocate the path
 *
 * The result must be freed by the caller with kfree().
 */


char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
{
	char *path;
	int len;

	len = get_kobj_path_length(kobj);
	if (len == 0)
		return NULL;
	path = kzalloc(len, gfp_mask);
	if (!path)
		return NULL;
	fill_kobj_path(kobj, path, len);

	return path;
}
Contributors
Person Tokens Prop Commits CommitProp
robert love robert love 55 83.33% 1 25.00%
chuck ebbert chuck ebbert 9 13.64% 1 25.00%
burman yan burman yan 1 1.52% 1 25.00%
al viro al viro 1 1.52% 1 25.00%
Total 66 100.00% 4 100.00%


EXPORT_SYMBOL_GPL(kobject_get_path);

/* add the kobject to its kset's list */


static void kobj_kset_join(struct kobject *kobj)
{
	if (!kobj->kset)
		return;

	kset_get(kobj->kset);
	spin_lock(&kobj->kset->list_lock);
	list_add_tail(&kobj->entry, &kobj->kset->list);
	spin_unlock(&kobj->kset->list_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
kay sievers kay sievers 32 52.46% 1 25.00%
patrick mochel patrick mochel 22 36.07% 1 25.00%
greg kroah-hartman greg kroah-hartman 7 11.48% 2 50.00%
Total 61 100.00% 4 100.00%

/* remove the kobject from its kset's list */


static void kobj_kset_leave(struct kobject *kobj)
{
	if (!kobj->kset)
		return;

	spin_lock(&kobj->kset->list_lock);
	list_del_init(&kobj->entry);
	spin_unlock(&kobj->kset->list_lock);
	kset_put(kobj->kset);
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mochel patrick mochel 39 72.22% 1 25.00%
kay sievers kay sievers 8 14.81% 1 25.00%
greg kroah-hartman greg kroah-hartman 4 7.41% 1 25.00%
alan stern alan stern 3 5.56% 1 25.00%
Total 54 100.00% 4 100.00%



static void kobject_init_internal(struct kobject *kobj)
{
	if (!kobj)
		return;
	kref_init(&kobj->kref);
	INIT_LIST_HEAD(&kobj->entry);
	kobj->state_in_sysfs = 0;
	kobj->state_add_uevent_sent = 0;
	kobj->state_remove_uevent_sent = 0;
	kobj->state_initialized = 1;
}


Contributors
Person Tokens Prop Commits CommitProp
kay sievers kay sievers 25 43.86% 1 25.00%
greg kroah-hartman greg kroah-hartman 24 42.11% 1 25.00%
patrick mochel patrick mochel 5 8.77% 1 25.00%
alan stern alan stern 3 5.26% 1 25.00%
Total 57 100.00% 4 100.00%



static int kobject_add_internal(struct kobject *kobj)
{
	int error = 0;
	struct kobject *parent;

	if (!kobj)
		return -ENOENT;

	if (!kobj->name || !kobj->name[0]) {
		WARN(1, "kobject: (%p): attempted to be registered with empty "
			 "name!\n", kobj);
		return -EINVAL;
	}

	parent = kobject_get(kobj->parent);

	/* join kset if set, use it as parent if we do not already have one */
	if (kobj->kset) {
		if (!parent)
			parent = kobject_get(&kobj->kset->kobj);
		kobj_kset_join(kobj);
		kobj->parent = parent;
	}

	pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
		 kobject_name(kobj), kobj, __func__,
		 parent ? kobject_name(parent) : "<NULL>",
		 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");

	error = create_dir(kobj);
	if (error) {
		kobj_kset_leave(kobj);
		kobject_put(parent);
		kobj->parent = NULL;

		/* be noisy on error issues */
		if (error == -EEXIST)
			WARN(1, "%s failed for %s with "
			     "-EEXIST, don't try to register things with "
			     "the same name in the same directory.\n",
			     __func__, kobject_name(kobj));
		else
			WARN(1, "%s failed for %s (error: %d parent: %s)\n",
			     __func__, kobject_name(kobj), error,
			     parent ? kobject_name(parent) : "'none'");
	} else
		kobj->state_in_sysfs = 1;

	return error;
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mochel patrick mochel 89 37.87% 8 34.78%
greg kroah-hartman greg kroah-hartman 67 28.51% 10 43.48%
kay sievers kay sievers 57 24.26% 2 8.70%
dan williams dan williams 16 6.81% 1 4.35%
arjan van de ven arjan van de ven 3 1.28% 1 4.35%
harvey harrison harvey harrison 3 1.28% 1 4.35%
Total 235 100.00% 23 100.00%

/**
 * kobject_set_name_vargs - Set the name of an kobject
 * @kobj: struct kobject to set the name of
 * @fmt: format string used to build the name
 * @vargs: vargs to format the string.
 */


int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
				  va_list vargs)
{
	const char *s;

	if (kobj->name && !fmt)
		return 0;

	s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
	if (!s)
		return -ENOMEM;

	/*
         * ewww... some of these buggers have '/' in the name ... If
         * that's the case, we need to make sure we have an actual
         * allocated copy to modify, since kvasprintf_const may have
         * returned something from .rodata.
         */
	if (strchr(s, '/')) {
		char *t;

		t = kstrdup(s, GFP_KERNEL);
		kfree_const(s);
		if (!t)
			return -ENOMEM;
		strreplace(t, '/', '!');
		s = t;
	}
	kfree_const(kobj->name);
	kobj->name = s;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
rasmus villemoes rasmus villemoes 61 49.59% 2 28.57%
patrick mochel patrick mochel 27 21.95% 1 14.29%
kay sievers kay sievers 24 19.51% 2 28.57%
greg kroah-hartman greg kroah-hartman 11 8.94% 2 28.57%
Total 123 100.00% 7 100.00%

/**
 * kobject_set_name - Set the name of a kobject
 * @kobj: struct kobject to set the name of
 * @fmt: format string used to build the name
 *
 * This sets the name of the kobject.  If you have already added the
 * kobject to the system, you must call kobject_rename() in order to
 * change the name of the kobject.
 */


int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
{
	va_list vargs;
	int retval;

	va_start(vargs, fmt);
	retval = kobject_set_name_vargs(kobj, fmt, vargs);
	va_end(vargs);

	return retval;
}
Contributors
Person Tokens Prop Commits CommitProp
greg kroah-hartman greg kroah-hartman 25 51.02% 1 25.00%
patrick mochel patrick mochel 10 20.41% 1 25.00%
andrew morton andrew morton 10 20.41% 1 25.00%
kay sievers kay sievers 4 8.16% 1 25.00%
Total 49 100.00% 4 100.00%


EXPORT_SYMBOL(kobject_set_name);

/**
 * kobject_init - initialize a kobject structure
 * @kobj: pointer to the kobject to initialize
 * @ktype: pointer to the ktype for this kobject.
 *
 * This function will properly initialize a kobject such that it can then
 * be passed to the kobject_add() call.
 *
 * After this function is called, the kobject MUST be cleaned up by a call
 * to kobject_put(), not by a call to kfree directly to ensure that all of
 * the memory is cleaned up properly.
 */


void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
{
	char *err_str;

	if (!kobj) {
		err_str = "invalid kobject pointer!";
		goto error;
	}
	if (!ktype) {
		err_str = "must have a ktype to be initialized properly!\n";
		goto error;
	}
	if (kobj->state_initialized) {
		/* do not error out as sometimes we can recover */
		printk(KERN_ERR "kobject (%p): tried to init an initialized "
		       "object, something is seriously wrong.\n", kobj);
		dump_stack();
	}

	kobject_init_internal(kobj);
	kobj->ktype = ktype;
	return;

error:
	printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
	dump_stack();
}
Contributors
Person Tokens Prop Commits CommitProp
greg kroah-hartman greg kroah-hartman 87 91.58% 3 75.00%
kay sievers kay sievers 8 8.42% 1 25.00%
Total 95 100.00% 4 100.00%


EXPORT_SYMBOL(kobject_init);


static __printf(3, 0) int kobject_add_varg(struct kobject *kobj,
					   struct kobject *parent,
					   const char *fmt, va_list vargs)
{
	int retval;

	retval = kobject_set_name_vargs(kobj, fmt, vargs);
	if (retval) {
		printk(KERN_ERR "kobject: can not set name properly!\n");
		return retval;
	}
	kobj->parent = parent;
	return kobject_add_internal(kobj);
}

/**
 * kobject_add - the main kobject add function
 * @kobj: the kobject to add
 * @parent: pointer to the parent of the kobject.
 * @fmt: format to name the kobject with.
 *
 * The kobject name is set and added to the kobject hierarchy in this
 * function.
 *
 * If @parent is set, then the parent of the @kobj will be set to it.
 * If @parent is NULL, then the parent of the @kobj will be set to the
 * kobject associated with the kset assigned to this kobject.  If no kset
 * is assigned to the kobject, then the kobject will be located in the
 * root of the sysfs tree.
 *
 * If this function returns an error, kobject_put() must be called to
 * properly clean up the memory associated with the object.
 * Under no instance should the kobject that is passed to this function
 * be directly freed with a call to kfree(), that can leak memory.
 *
 * Note, no "add" uevent will be created with this call, the caller should set
 * up all of the necessary sysfs files for the object and then call
 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
 * userspace is properly notified of this kobject's creation.
 */
int 
kobject_add(struct kobject *kobj, struct kobject *parent,
		const char *fmt, ...)
{
	va_list args;
	int retval;

	if (!kobj)
		return -EINVAL;

	if (!kobj->state_initialized) {
		printk(KERN_ERR "kobject '%s' (%p): tried to add an "
		       "uninitialized object, something is seriously wrong.\n",
		       kobject_name(kobj), kobj);
		dump_stack();
		return -EINVAL;
	}
	va_start(args, fmt);
	retval = kobject_add_varg(kobj, parent, fmt, args);
	va_end(args);

	return retval;
}

EXPORT_SYMBOL(kobject_add);

/**
 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
 * @kobj: pointer to the kobject to initialize
 * @ktype: pointer to the ktype for this kobject.
 * @parent: pointer to the parent of this kobject.
 * @fmt: the name of the kobject.
 *
 * This function combines the call to kobject_init() and
 * kobject_add().  The same type of error handling after a call to
 * kobject_add() and kobject lifetime rules are the same here.
 */


int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
			 struct kobject *parent, const char *fmt, ...)
{
	va_list args;
	int retval;

	kobject_init(kobj, ktype);

	va_start(args, fmt);
	retval = kobject_add_varg(kobj, parent, fmt, args);
	va_end(args);

	return retval;
}
Contributors
Person Tokens Prop Commits CommitProp
greg kroah-hartman greg kroah-hartman 68 100.00% 2 100.00%
Total 68 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(kobject_init_and_add);

/**
 * kobject_rename - change the name of an object
 * @kobj: object in question.
 * @new_name: object's new name
 *
 * It is the responsibility of the caller to provide mutual
 * exclusion between two different calls of kobject_rename
 * on the same kobject and to ensure that new_name is valid and
 * won't conflict with other kobjects.
 */


int kobject_rename(struct kobject *kobj, const char *new_name)
{
	int error = 0;
	const char *devpath = NULL;
	const char *dup_name = NULL, *name;
	char *devpath_string = NULL;
	char *envp[2];

	kobj = kobject_get(kobj);
	if (!kobj)
		return -EINVAL;
	if (!kobj->parent)
		return -EINVAL;

	devpath = kobject_get_path(kobj, GFP_KERNEL);
	if (!devpath) {
		error = -ENOMEM;
		goto out;
	}
	devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
	if (!devpath_string) {
		error = -ENOMEM;
		goto out;
	}
	sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
	envp[0] = devpath_string;
	envp[1] = NULL;

	name = dup_name = kstrdup_const(new_name, GFP_KERNEL);
	if (!name) {
		error = -ENOMEM;
		goto out;
	}

	error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
	if (error)
		goto out;

	/* Install the new kobject name */
	dup_name = kobj->name;
	kobj->name = name;

	/* This function is mostly/only used for network interface.
         * Some hotplug package track interfaces by their name and
         * therefore want to know when the name is changed by the user. */
	kobject_uevent_env(kobj, KOBJ_MOVE, envp);

out:
	kfree_const(dup_name);
	kfree(devpath_string);
	kfree(devpath);
	kobject_put(kobj);

	return error;
}
Contributors
Person Tokens Prop Commits CommitProp
jean tourrilhes jean tourrilhes 120 48.39% 1 12.50%
eric w. biederman eric w. biederman 80 32.26% 2 25.00%
greg kroah-hartman greg kroah-hartman 27 10.89% 1 12.50%
maneesh soni maneesh soni 12 4.84% 1 12.50%
tejun heo tejun heo 6 2.42% 1 12.50%
rasmus villemoes rasmus villemoes 2 0.81% 1 12.50%
dmitry torokhov dmitry torokhov 1 0.40% 1 12.50%
Total 248 100.00% 8 100.00%


EXPORT_SYMBOL_GPL(kobject_rename);

/**
 * kobject_move - move object to another parent
 * @kobj: object in question.
 * @new_parent: object's new parent (can be NULL)
 */


int kobject_move(struct kobject *kobj, struct kobject *new_parent)
{
	int error;
	struct kobject *old_parent;
	const char *devpath = NULL;
	char *devpath_string = NULL;
	char *envp[2];

	kobj = kobject_get(kobj);
	if (!kobj)
		return -EINVAL;
	new_parent = kobject_get(new_parent);
	if (!new_parent) {
		if (kobj->kset)
			new_parent = kobject_get(&kobj->kset->kobj);
	}

	/* old object path */
	devpath = kobject_get_path(kobj, GFP_KERNEL);
	if (!devpath) {
		error = -ENOMEM;
		goto out;
	}
	devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
	if (!devpath_string) {
		error = -ENOMEM;
		goto out;
	}
	sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
	envp[0] = devpath_string;
	envp[1] = NULL;
	error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
	if (error)
		goto out;
	old_parent = kobj->parent;
	kobj->parent = new_parent;
	new_parent = NULL;
	kobject_put(old_parent);
	kobject_uevent_env(kobj, KOBJ_MOVE, envp);
out:
	kobject_put(new_parent);
	kobject_put(kobj);
	kfree(devpath_string);
	kfree(devpath);
	return error;
}
Contributors
Person Tokens Prop Commits CommitProp
cornelia huck cornelia huck 229 93.85% 2 50.00%
dmitriy monakhov dmitriy monakhov 9 3.69% 1 25.00%
tejun heo tejun heo 6 2.46% 1 25.00%
Total 244 100.00% 4 100.00%


EXPORT_SYMBOL_GPL(kobject_move);

/**
 * kobject_del - unlink kobject from hierarchy.
 * @kobj: object.
 */


void kobject_del(struct kobject *kobj)
{
	struct kernfs_node *sd;

	if (!kobj)
		return;

	sd = kobj->sd;
	sysfs_remove_dir(kobj);
	sysfs_put(sd);

	kobj->state_in_sysfs = 0;
	kobj_kset_leave(kobj);
	kobject_put(kobj->parent);
	kobj->parent = NULL;
}
Contributors
Person Tokens Prop Commits CommitProp
kay sievers kay sievers 20 32.79% 1 14.29%
patrick mochel patrick mochel 19 31.15% 3 42.86%
tejun heo tejun heo 16 26.23% 2 28.57%
greg kroah-hartman greg kroah-hartman 6 9.84% 1 14.29%
Total 61 100.00% 7 100.00%


EXPORT_SYMBOL(kobject_del);

/**
 * kobject_get - increment refcount for object.
 * @kobj: object.
 */


struct kobject *kobject_get(struct kobject *kobj)
{
	if (kobj) {
		if (!kobj->state_initialized)
			WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
			       "initialized, yet kobject_get() is being "
			       "called.\n", kobject_name(kobj), kobj);
		kref_get(&kobj->kref);
	}
	return kobj;
}
Contributors
Person Tokens Prop Commits CommitProp
ethan zhao ethan zhao 26 49.06% 1 16.67%
patrick mochel patrick mochel 24 45.28% 3 50.00%
greg kroah-hartman greg kroah-hartman 3 5.66% 2 33.33%
Total 53 100.00% 6 100.00%


EXPORT_SYMBOL(kobject_get);



static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
{
	if (!kref_get_unless_zero(&kobj->kref))
		kobj = NULL;
	return kobj;
}

Contributors
Person Tokens Prop Commits CommitProp
linus torvalds linus torvalds 31 96.88% 1 50.00%
anatol pomozov anatol pomozov 1 3.12% 1 50.00%
Total 32 100.00% 2 100.00%

/*
 * kobject_cleanup - free kobject resources.
 * @kobj: object to cleanup
 */


static void kobject_cleanup(struct kobject *kobj)
{
	struct kobj_type *t = get_ktype(kobj);
	const char *name = kobj->name;

	pr_debug("kobject: '%s' (%p): %s, parent %p\n",
		 kobject_name(kobj), kobj, __func__, kobj->parent);

	if (t && !t->release)
		pr_debug("kobject: '%s' (%p): does not have a release() "
			 "function, it is broken and must be fixed.\n",
			 kobject_name(kobj), kobj);

	/* send "remove" if the caller did not do it but sent "add" */
	if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
		pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
			 kobject_name(kobj), kobj);
		kobject_uevent(kobj, KOBJ_REMOVE);
	}

	/* remove from sysfs if the caller did not do it */
	if (kobj->state_in_sysfs) {
		pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
			 kobject_name(kobj), kobj);
		kobject_del(kobj);
	}

	if (t && t->release) {
		pr_debug("kobject: '%s' (%p): calling ktype release\n",
			 kobject_name(kobj), kobj);
		t->release(kobj);
	}

	/* free name if we allocated it */
	if (name) {
		pr_debug("kobject: '%s': free name\n", name);
		kfree_const(name);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
kay sievers kay sievers 104 58.76% 2 14.29%
patrick mochel patrick mochel 50 28.25% 6 42.86%
greg kroah-hartman greg kroah-hartman 16 9.04% 3 21.43%
russell king russell king 5 2.82% 1 7.14%
harvey harrison harvey harrison 1 0.56% 1 7.14%
rasmus villemoes rasmus villemoes 1 0.56% 1 7.14%
Total 177 100.00% 14 100.00%

#ifdef CONFIG_DEBUG_KOBJECT_RELEASE


static void kobject_delayed_cleanup(struct work_struct *work)
{
	kobject_cleanup(container_of(to_delayed_work(work),
				     struct kobject, release));
}
Contributors
Person Tokens Prop Commits CommitProp
russell king russell king 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%

#endif



static void kobject_release(struct kref *kref)
{
	struct kobject *kobj = container_of(kref, struct kobject, kref);
#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
	unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
	pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
		 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
	INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);

	schedule_delayed_work(&kobj->release, delay);
#else
	kobject_cleanup(kobj);
#endif
}

Contributors
Person Tokens Prop Commits CommitProp
russell king russell king 51 54.84% 1 25.00%
greg kroah-hartman greg kroah-hartman 22 23.66% 1 25.00%
bjorn helgaas bjorn helgaas 19 20.43% 1 25.00%
fengguang wu fengguang wu 1 1.08% 1 25.00%
Total 93 100.00% 4 100.00%

/**
 * kobject_put - decrement refcount for object.
 * @kobj: object.
 *
 * Decrement the refcount, and if 0, call kobject_cleanup().
 */


void kobject_put(struct kobject *kobj)
{
	if (kobj) {
		if (!kobj->state_initialized)
			WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
			       "initialized, yet kobject_put() is being "
			       "called.\n", kobject_name(kobj), kobj);
		kref_put(&kobj->kref, kobject_release);
	}
}
Contributors
Person Tokens Prop Commits CommitProp
greg kroah-hartman greg kroah-hartman 29 58.00% 2 33.33%
patrick mochel patrick mochel 18 36.00% 3 50.00%
arjan van de ven arjan van de ven 3 6.00% 1 16.67%
Total 50 100.00% 6 100.00%


EXPORT_SYMBOL(kobject_put);



static void dynamic_kobj_release(struct kobject *kobj)
{
	pr_debug("kobject: (%p): %s\n", kobj, __func__);
	kfree(kobj);
}

Contributors
Person Tokens Prop Commits CommitProp
jun'ichi nomura jun'ichi nomura 15 60.00% 1 20.00%
greg kroah-hartman greg kroah-hartman 8 32.00% 2 40.00%
kay sievers kay sievers 1 4.00% 1 20.00%
harvey harrison harvey harrison 1 4.00% 1 20.00%
Total 25 100.00% 5 100.00%


static struct kobj_type dynamic_kobj_ktype = {
	.release	= dynamic_kobj_release,
	.sysfs_ops	= &kobj_sysfs_ops,
};

/**
 * kobject_create - create a struct kobject dynamically
 *
 * This function creates a kobject structure dynamically and sets it up
 * to be a "dynamic" kobject with a default release function set up.
 *
 * If the kobject was not able to be created, NULL will be returned.
 * The kobject structure returned from here must be cleaned up with a
 * call to kobject_put() and not kfree(), as kobject_init() has
 * already been called on this structure.
 */


struct kobject *kobject_create(void)
{
	struct kobject *kobj;

	kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
	if (!kobj)
		return NULL;

	kobject_init(kobj, &dynamic_kobj_ktype);
	return kobj;
}

Contributors
Person Tokens Prop Commits CommitProp
greg kroah-hartman greg kroah-hartman 44 95.65% 2 66.67%
jun'ichi nomura jun'ichi nomura 2 4.35% 1 33.33%
Total 46 100.00% 3 100.00%

/**
 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
 *
 * @name: the name for the kobject
 * @parent: the parent kobject of this kobject, if any.
 *
 * This function creates a kobject structure dynamically and registers it
 * with sysfs.  When you are finished with this structure, call
 * kobject_put() and the structure will be dynamically freed when
 * it is no longer being used.
 *
 * If the kobject was not able to be created, NULL will be returned.
 */


struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
{
	struct kobject *kobj;
	int retval;

	kobj = kobject_create();
	if (!kobj)
		return NULL;

	retval = kobject_add(kobj, parent, "%s", name);
	if (retval) {
		printk(KERN_WARNING "%s: kobject_add error: %d\n",
		       __func__, retval);
		kobject_put(kobj);
		kobj = NULL;
	}
	return kobj;
}
Contributors
Person Tokens Prop Commits CommitProp
greg kroah-hartman greg kroah-hartman 76 96.20% 2 50.00%
jun'ichi nomura jun'ichi nomura 2 2.53% 1 25.00%
harvey harrison harvey harrison 1 1.27% 1 25.00%
Total 79 100.00% 4 100.00%


EXPORT_SYMBOL_GPL(kobject_create_and_add);

/**
 * kset_init - initialize a kset for use
 * @k: kset
 */


void kset_init(struct kset *k)
{
	kobject_init_internal(&k->kobj);
	INIT_LIST_HEAD(&k->list);
	spin_lock_init(&k->list_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mochel patrick mochel 25 73.53% 2 50.00%
greg kroah-hartman greg kroah-hartman 9 26.47% 2 50.00%
Total 34 100.00% 4 100.00%

/* default kobject attribute operations */


static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
			      char *buf)
{
	struct kobj_attribute *kattr;
	ssize_t ret = -EIO;

	kattr = container_of(attr, struct kobj_attribute, attr);
	if (kattr->show)
		ret = kattr->show(kobj, kattr, buf);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
kay sievers kay sievers 65 100.00% 1 100.00%
Total 65 100.00% 1 100.00%



static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
			       const char *buf, size_t count)
{
	struct kobj_attribute *kattr;
	ssize_t ret = -EIO;

	kattr = container_of(attr, struct kobj_attribute, attr);
	if (kattr->store)
		ret = kattr->store(kobj, kattr, buf, count);
	return ret;
	Person	Tokens	Prop	Commits	CommitProp
tejun heo	tejun heo	46	97.87%	1	50.00%
linus torvalds	linus torvalds	1	2.13%	1	50.00%
	Total	47	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.9 lib/kobject.c

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