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kobject: Export kobject_get_unless_zero()

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Make the function available for outside use and fortify it against NULL
kobject.

CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2017-03-23 01:37:01 +01:00 committed by Jens Axboe
parent f759741d9d
commit c70c176ff8
2 changed files with 6 additions and 1 deletions
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2
include/linux/kobject.h
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@ -108,6 +108,8 @@ extern int __must_check kobject_rename(struct kobject *, const char *new_name);
extern int __must_check kobject_move(struct kobject *, struct kobject *); extern int __must_check kobject_move(struct kobject *, struct kobject *);
extern struct kobject *kobject_get(struct kobject *kobj); extern struct kobject *kobject_get(struct kobject *kobj);
extern struct kobject * __must_check kobject_get_unless_zero(
struct kobject *kobj);
extern void kobject_put(struct kobject *kobj); extern void kobject_put(struct kobject *kobj);
extern const void *kobject_namespace(struct kobject *kobj); extern const void *kobject_namespace(struct kobject *kobj);

5
lib/kobject.c
View File

@ -601,12 +601,15 @@ struct kobject *kobject_get(struct kobject *kobj)
} }
EXPORT_SYMBOL(kobject_get); EXPORT_SYMBOL(kobject_get);
static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
{ {
if (!kobj)
return NULL;
if (!kref_get_unless_zero(&kobj->kref)) if (!kref_get_unless_zero(&kobj->kref))
kobj = NULL; kobj = NULL;
return kobj; return kobj;
} }
EXPORT_SYMBOL(kobject_get_unless_zero);
/* /*
* kobject_cleanup - free kobject resources. * kobject_cleanup - free kobject resources.