configfs_register_group() shouldn't be (and isn't) called in rmdirable parts

revert cc57c07343bd "configfs: fix registered group removal"
It was an attempt to handle something that fundamentally doesn't
work - configfs_register_group() should never be done in a part
of tree that can be rmdir'ed.  And in mainline it never had been,
so let's not borrow trouble; the fix was racy anyway, it would take
a lot more to make that work and desired semantics is not clear.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 0 insertions, 11 deletions

diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 92112915de8e..21a795679e20 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1771,16 +1771,6 @@ void configfs_unregister_group(struct config_group *group)
         struct dentry *dentry = group->cg_item.ci_dentry;
         struct dentry *parent = group->cg_item.ci_parent->ci_dentry;
 
-        mutex_lock(&subsys->su_mutex);
-        if (!group->cg_item.ci_parent->ci_group) {
-                /*
-                 * The parent has already been unlinked and detached
-                 * due to a rmdir.
-                 */
-                goto unlink_group;
-        }
-        mutex_unlock(&subsys->su_mutex);
-
         inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
         spin_lock(&configfs_dirent_lock);
         configfs_detach_prep(dentry, NULL);
@@ -1796,7 +1786,6 @@ void configfs_unregister_group(struct config_group *group)
         dput(dentry);
 
         mutex_lock(&subsys->su_mutex);
-unlink_group:
         unlink_group(group);
         mutex_unlock(&subsys->su_mutex);
 }