Commit fa4cd451 authored Feb 07, 2014 by Tejun Heo Committed by Greg Kroah-Hartman Feb 07, 2014

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>

parent 3eef34ad

include/linux/sysfs.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -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,

lib/kobject.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;