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kobject: Fix kobject_rename and !CONFIG_SYSFS

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When looking at kobject_rename I found two bugs with
that exist when sysfs support is disabled in the kernel.

kobject_rename does not change the name on the kobject when
sysfs support is not compiled in.

kobject_rename without locking attempts to check the
validity of a rename operation, which the kobject layer
simply does not have the infrastructure to do.

This patch documents the previously unstated requirement of
kobject_rename that is the responsibility of the caller to
provide mutual exclusion and to be certain that the new_name
for the kobject is valid.

This patch modifies sysfs_rename_dir in !CONFIG_SYSFS case
to call kobject_set_name to actually change the kobject_name.

This patch removes the bogus and misleading check in kobject_rename
that attempts to see if a rename is valid.  The check is bogus
because we do not have the proper locking.  The check is misleading
because it looks like we can and do perform checking at the kobject
level that we don't.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Eric W. Biederman
2008-05-08 14:41:00 -07:00
committed by Greg Kroah-Hartman
parent 8c0e3998f5
commit 030c1d2bfc
4 changed files with 17 additions and 14 deletions
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4
include/linux/sysfs.h
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@@ -20,6 +20,8 @@
struct kobject;
struct module;
extern int kobject_set_name(struct kobject *kobj, const char *name, ...)
__attribute__((format(printf, 2, 3)));
/* FIXME
* The *owner field is no longer used, but leave around
* until the tree gets cleaned up fully.
@@ -147,7 +149,7 @@ static inline void sysfs_remove_dir(struct kobject *kobj)
static inline int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
{
return 0;
return kobject_set_name(kobj, "%s", new_name);
}
static inline int sysfs_move_dir(struct kobject *kobj,