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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: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bjorn Helgaas 2013-12-05 17:37:51 -07:00 committed by Greg Kroah-Hartman
parent 2322392b02
commit 89c86a64cd
1 changed files with 6 additions and 3 deletions
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9
lib/kobject.c
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@ -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