diff options
| author | Christoph Lameter <clameter@sgi.com> | 2008-01-08 09:29:05 +0300 |
|---|---|---|
| committer | Christoph Lameter <clameter@sgi.com> | 2008-02-04 21:56:01 +0300 |
| commit | 151c602f79cb9154c3f3d83223cae355af463d6f (patch) | |
| tree | 140f75b7a100c50b9d337b3a128dd34b5731780f | |
| parent | e374d4835668a8c6aec7cefc0a44df69f9679017 (diff) | |
| download | linux-151c602f79cb9154c3f3d83223cae355af463d6f.tar.xz | |
SLUB: Fix sysfs refcounting
If CONFIG_SYSFS is set then free the kmem_cache structure when
sysfs tells us its okay.
Otherwise there is the danger (as pointed out by
Al Viro) that sysfs thinks the kobject still exists after
kmem_cache_destroy() removed it.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Reviewed-by: Pekka J Enberg <penberg@cs.helsinki.fi>
| -rw-r--r-- | mm/slub.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/mm/slub.c b/mm/slub.c index 93f5c288f024..65bf21dc996a 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -247,7 +247,10 @@ static void sysfs_slab_remove(struct kmem_cache *); static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) { return 0; } -static inline void sysfs_slab_remove(struct kmem_cache *s) {} +static inline void sysfs_slab_remove(struct kmem_cache *s) +{ + kfree(s); +} #endif /******************************************************************** @@ -2322,7 +2325,6 @@ void kmem_cache_destroy(struct kmem_cache *s) if (kmem_cache_close(s)) WARN_ON(1); sysfs_slab_remove(s); - kfree(s); } else up_write(&slub_lock); } @@ -3937,6 +3939,13 @@ static ssize_t slab_attr_store(struct kobject *kobj, return err; } +static void kmem_cache_release(struct kobject *kobj) +{ + struct kmem_cache *s = to_slab(kobj); + + kfree(s); +} + static struct sysfs_ops slab_sysfs_ops = { .show = slab_attr_show, .store = slab_attr_store, @@ -3944,6 +3953,7 @@ static struct sysfs_ops slab_sysfs_ops = { static struct kobj_type slab_ktype = { .sysfs_ops = &slab_sysfs_ops, + .release = kmem_cache_release }; static int uevent_filter(struct kset *kset, struct kobject *kobj) @@ -4045,6 +4055,7 @@ static void sysfs_slab_remove(struct kmem_cache *s) { kobject_uevent(&s->kobj, KOBJ_REMOVE); kobject_del(&s->kobj); + kobject_put(&s->kobj); } /* |