sysfs, kobject: add sysfs wrapper for kernfs_enable_ns()

Currently, kobject is invoking kernfs_enable_ns() directly.  This is
fine now as sysfs and kernfs are enabled and disabled together.  If
sysfs is disabled, kernfs_enable_ns() is switched to dummy
implementation too and everything is fine; however, kernfs will soon
have its own config option CONFIG_KERNFS and !SYSFS && KERNFS will be
possible, which can make kobject call into non-dummy
kernfs_enable_ns() with NULL kernfs_node pointers leading to an oops.

Introduce sysfs_enable_ns() which is a wrapper around
kernfs_enable_ns() so that it can be made a noop depending only on
CONFIG_SYSFS regardless of the planned CONFIG_KERNFS.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 10 insertions, 1 deletions

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 14df05415af9..fdaa0c6fc7a2 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -244,6 +244,11 @@ void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
 
 int __must_check sysfs_init(void);
 
+static inline void sysfs_enable_ns(struct kernfs_node *kn)
+{
+        return kernfs_enable_ns(kn);
+}
+
 #else /* CONFIG_SYSFS */
 
 static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
@@ -416,6 +421,10 @@ static inline int __must_check sysfs_init(void)
         return 0;
 }
 
+static inline void sysfs_enable_ns(struct kernfs_node *kn)
+{
+}
+
 #endif /* CONFIG_SYSFS */
 
 static inline int __must_check sysfs_create_file(struct kobject *kobj,
diff --git a/lib/kobject.c b/lib/kobject.c
index cb14aeac4cca..58751bb80a7c 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -94,7 +94,7 @@ static int create_dir(struct kobject *kobj)
                 BUG_ON(ops->type >= KOBJ_NS_TYPES);
                 BUG_ON(!kobj_ns_type_registered(ops->type));
 
-                kernfs_enable_ns(kobj->sd);
+                sysfs_enable_ns(kobj->sd);
         }
 
         return 0;