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kref: minor cleanup

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- make warning smp-safe
 - result of atomic _unless_zero functions should be checked by caller
   to avoid use-after-free error
 - trivial whitespace fix.

Link: https://lkml.org/lkml/2013/4/12/391

Tested: compile x86, boot machine and run xfstests
Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
[ Removed line-break, changed to use WARN_ON_ONCE()  - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anatol Pomozov
2013-05-07 15:37:48 -07:00
committed by Linus Torvalds
parent 292088ee03
commit 2d864e4171
2 changed files with 7 additions and 4 deletions
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2
lib/kobject.c
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@@ -529,7 +529,7 @@ struct kobject *kobject_get(struct kobject *kobj)
return kobj;
}
static struct kobject *kobject_get_unless_zero(struct kobject *kobj)
static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
{
if (!kref_get_unless_zero(&kobj->kref))
kobj = NULL;