[PATCH v2] kobject: Restore old behaviour of kobject_del(NULL)

[Andy Shevchenko]

The commit 079ad2fb4bf9 ("kobject: Avoid premature parent object freeing in
kobject_cleanup()") inadvertently dropped a possibility to call kobject_del()
with NULL pointer. Restore the old behaviour.

Fixes: 079ad2fb4bf9 ("kobject: Avoid premature parent object freeing in 
kobject_cleanup()")
Reported-by: Qu Wenruo <quwenruo.bt...@gmx.com>
Cc: Heikki Krogerus <heikki.kroge...@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
v2: replaced ?: with plain conditional (Greg)
 lib/kobject.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/kobject.c b/lib/kobject.c
index 3afb939f2a1c..9dce68c378e6 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -637,8 +637,12 @@ static void __kobject_del(struct kobject *kobj)
  */
 void kobject_del(struct kobject *kobj)
 {
-       struct kobject *parent = kobj->parent;
+       struct kobject *parent;
+
+       if (!kobj)
+               return;
 
+       parent = kobj->parent;
        __kobject_del(kobj);
        kobject_put(parent);
 }
-- 
2.27.0