From f19e4ed1e1edbfa3c9ccb9fed17759b7d6db24c6 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 29 Aug 2019 23:13:30 -0400
Subject: [PATCH] configfs_register_group() shouldn't be (and isn't) called in rmdirable parts
Git-commit: f19e4ed1e1edbfa3c9ccb9fed17759b7d6db24c6
Patch-mainline: v5.3-rc8
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
fs/configfs/dir.c | 11 -----------
1 file changed, 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);
}
--
2.16.4