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kref: remove kref_set

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Of the three uses of kref_set in the kernel:

 One really should be kref_put as the code is letting go of a
    reference,
 Two really should be kref_init because the kref is being
    initialised.

This suggests that making kref_set available encourages bad code.
So fix the three uses and remove kref_set completely.

Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
NeilBrown 2010-03-16 15:14:51 +11:00 • committed by Greg Kroah-Hartman
parent dd336c554d
commit db1afffab0
4 changed files with 6 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/linux/kref.h
View file

@ -21,7 +21,6 @@ struct kref {
atomic_t refcount; atomic_t refcount;
}; };
void kref_set(struct kref *kref, int num);
void kref_init(struct kref *kref); void kref_init(struct kref *kref);
void kref_get(struct kref *kref); void kref_get(struct kref *kref);
int kref_put(struct kref *kref, void (*release) (struct kref *kref)); int kref_put(struct kref *kref, void (*release) (struct kref *kref));

4
kernel/user_namespace.c
View file

@ -54,8 +54,8 @@ int create_user_ns(struct cred *new)
#endif #endif
/* tgcred will be cleared in our caller bc CLONE_THREAD won't be set */ /* tgcred will be cleared in our caller bc CLONE_THREAD won't be set */
/* alloc_uid() incremented the userns refcount. Just set it to 1 */ /* root_user holds a reference to ns, our reference can be dropped */
kref_set(&ns->kref, 1); put_user_ns(ns);
return 0; return 0;
} }

15
lib/kref.c
View file

@ -15,24 +15,14 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/slab.h> #include <linux/slab.h>
/**
* kref_set - initialize object and set refcount to requested number.
* @kref: object in question.
* @num: initial reference counter
*/
void kref_set(struct kref *kref, int num)
{
atomic_set(&kref->refcount, num);
smp_mb();
}
/** /**
* kref_init - initialize object. * kref_init - initialize object.
* @kref: object in question. * @kref: object in question.
*/ */
void kref_init(struct kref *kref) void kref_init(struct kref *kref)
{ {
kref_set(kref, 1); atomic_set(&kref->refcount, 1);
smp_mb();
} }
/** /**
@ -72,7 +62,6 @@ int kref_put(struct kref *kref, void (*release)(struct kref *kref))
return 0; return 0;
} }
EXPORT_SYMBOL(kref_set);
EXPORT_SYMBOL(kref_init); EXPORT_SYMBOL(kref_init);
EXPORT_SYMBOL(kref_get); EXPORT_SYMBOL(kref_get);
EXPORT_SYMBOL(kref_put); EXPORT_SYMBOL(kref_put);

4
security/integrity/ima/ima_iint.c
View file

@ -94,7 +94,7 @@ void iint_free(struct kref *kref)
iint->opencount); iint->opencount);
iint->opencount = 0; iint->opencount = 0;
} }
kref_set(&iint->refcount, 1); kref_init(&iint->refcount);
kmem_cache_free(iint_cache, iint); kmem_cache_free(iint_cache, iint);
} }
@ -133,7 +133,7 @@ static void init_once(void *foo)
iint->readcount = 0; iint->readcount = 0;
iint->writecount = 0; iint->writecount = 0;
iint->opencount = 0; iint->opencount = 0;
kref_set(&iint->refcount, 1); kref_init(&iint->refcount);
} }
static int __init ima_iintcache_init(void) static int __init ima_iintcache_init(void)