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Revert "kobject: Make sure the parent does not get released before its children" 

This reverts commit 4ef12f7198.

Guenter reports:

	All my arm64be (arm64 big endian) boot tests crash with this
	patch applied. Reverting it fixes the problem. Crash log and
	bisect results (from pending-fixes branch) below.

And also:
	arm64 images don't crash but report lots of "poison overwritten"
	backtraces like the one below. On arm, I see "refcount_t:
	underflow", also attached.  I didn't bisect those, but given the
	context I would suspect the same culprit.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200513151840.36400-1-heikki.krogerus@linux.intel.com
Cc: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: kernel test robot <rong.a.chen@intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.7-dsi
Greg Kroah-Hartman 2020-05-23 17:11:11 +02:00
parent 4ef12f7198
commit e6764aa0e5
1 changed files with 10 additions and 20 deletions
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30
lib/kobject.c
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@ -599,7 +599,14 @@ out:
}
EXPORT_SYMBOL_GPL(kobject_move);
static void __kobject_del(struct kobject *kobj)
/**
* kobject_del() - Unlink kobject from hierarchy.
* @kobj: object.
*
* This is the function that should be called to delete an object
* successfully added via kobject_add().
*/
void kobject_del(struct kobject *kobj)
{
struct kernfs_node *sd;
const struct kobj_type *ktype;
@ -618,23 +625,9 @@ static void __kobject_del(struct kobject *kobj)
kobj->state_in_sysfs = 0;
kobj_kset_leave(kobj);
kobject_put(kobj->parent);
kobj->parent = NULL;
}
/**
* kobject_del() - Unlink kobject from hierarchy.
* @kobj: object.
*
* This is the function that should be called to delete an object
* successfully added via kobject_add().
*/
void kobject_del(struct kobject *kobj)
{
struct kobject *parent = kobj->parent;
__kobject_del(kobj);
kobject_put(parent);
}
EXPORT_SYMBOL(kobject_del);
/**
@ -670,7 +663,6 @@ EXPORT_SYMBOL(kobject_get_unless_zero);
*/
static void kobject_cleanup(struct kobject *kobj)
{
struct kobject *parent = kobj->parent;
struct kobj_type *t = get_ktype(kobj);
const char *name = kobj->name;
@ -692,7 +684,7 @@ static void kobject_cleanup(struct kobject *kobj)
if (kobj->state_in_sysfs) {
pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
kobject_name(kobj), kobj);
__kobject_del(kobj);
kobject_del(kobj);
}
if (t && t->release) {
@ -706,8 +698,6 @@ static void kobject_cleanup(struct kobject *kobj)
pr_debug("kobject: '%s': free name\n", name);
kfree_const(name);
}
kobject_put(parent);
}
#ifdef CONFIG_DEBUG_KOBJECT_RELEASE