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Commit 89c86a64 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Greg Kroah-Hartman
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kobject: delay kobject release for random time 



When CONFIG_DEBUG_KOBJECT_RELEASE=y, delay kobject release functions for a
random time between 1 and 8 seconds, which effectively changes the order in
which they're called.

Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2322392b

lib/kobject.c

+6 −3
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/export.h>

#include <linux/stat.h>

#include <linux/slab.h>

#include <linux/random.h>



/**

 * kobject_namespace - return @kobj's namespace tag
@@ -642,10 +643,12 @@ static void kobject_release(struct kref *kref) 
{

	struct kobject *kobj = container_of(kref, struct kobject, kref);

#ifdef CONFIG_DEBUG_KOBJECT_RELEASE

	pr_info("kobject: '%s' (%p): %s, parent %p (delayed)\n",

		 kobject_name(kobj), kobj, __func__, kobj->parent);

	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, HZ);



	schedule_delayed_work(&kobj->release, delay);

#else

	kobject_cleanup(kobj);

#endif