From ebdb773901ed0c65bbe1365a422b15e40ed9b8fa Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Mon, 20 Aug 2007 21:36:31 +0900
Subject: [PATCH] --- yaml --- r: 67982 b: refs/heads/master c:
 9918f9a4817cb6241c727b434d5f8ec5564198de h: refs/heads/master v: v3

---
 [refs]               |  2 +-
 trunk/fs/sysfs/dir.c | 38 ++++++++++++++++----------------------
 2 files changed, 17 insertions(+), 23 deletions(-)

diff --git a/[refs] b/[refs]
index cf383d7576c6..2e050f5e400e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 5a26b79c426f8e55ebf7204cb138eb6b1645d4d3
+refs/heads/master: 9918f9a4817cb6241c727b434d5f8ec5564198de
diff --git a/trunk/fs/sysfs/dir.c b/trunk/fs/sysfs/dir.c
index 36b6c796d4d5..463c5e3ccf1f 100644
--- a/trunk/fs/sysfs/dir.c
+++ b/trunk/fs/sysfs/dir.c
@@ -770,7 +770,7 @@ void sysfs_remove_dir(struct kobject * kobj)
 
 int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
 {
-	struct sysfs_dirent *sd;
+	struct sysfs_dirent *sd = kobj->sd;
 	struct dentry *parent = NULL;
 	struct dentry *old_dentry = NULL, *new_dentry = NULL;
 	const char *dup_name = NULL;
@@ -778,63 +778,57 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
 
 	mutex_lock(&sysfs_rename_mutex);
 
+	error = 0;
+	if (strcmp(sd->s_name, new_name) == 0)
+		goto out;	/* nothing to rename */
+
 	/* get the original dentry */
-	sd = kobj->sd;
 	old_dentry = sysfs_get_dentry(sd);
 	if (IS_ERR(old_dentry)) {
 		error = PTR_ERR(old_dentry);
-		goto out_dput;
+		goto out;
 	}
 
 	parent = old_dentry->d_parent;
 
 	/* lock parent and get dentry for new name */
 	mutex_lock(&parent->d_inode->i_mutex);
+	mutex_lock(&sysfs_mutex);
 
-	new_dentry = lookup_one_len(new_name, parent, strlen(new_name));
-	if (IS_ERR(new_dentry)) {
-		error = PTR_ERR(new_dentry);
-		goto out_unlock;
-	}
-
-	error = -EINVAL;
-	if (old_dentry == new_dentry)
+	error = -EEXIST;
+	if (sysfs_find_dirent(sd->s_parent, new_name))
 		goto out_unlock;
 
-	error = -EEXIST;
-	if (new_dentry->d_inode)
+	error = -ENOMEM;
+	new_dentry = d_alloc_name(parent, new_name);
+	if (!new_dentry)
 		goto out_unlock;
 
 	/* rename kobject and sysfs_dirent */
 	error = -ENOMEM;
 	new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
 	if (!new_name)
-		goto out_drop;
+		goto out_unlock;
 
 	error = kobject_set_name(kobj, "%s", new_name);
 	if (error)
-		goto out_drop;
+		goto out_unlock;
 
-	mutex_lock(&sysfs_mutex);
 	dup_name = sd->s_name;
 	sd->s_name = new_name;
-	mutex_unlock(&sysfs_mutex);
 
 	/* rename */
 	d_add(new_dentry, NULL);
 	d_move(old_dentry, new_dentry);
 
 	error = 0;
-	goto out_unlock;
-
- out_drop:
-	d_drop(new_dentry);
  out_unlock:
+	mutex_unlock(&sysfs_mutex);
 	mutex_unlock(&parent->d_inode->i_mutex);
- out_dput:
 	kfree(dup_name);
 	dput(old_dentry);
 	dput(new_dentry);
+ out:
 	mutex_unlock(&sysfs_rename_mutex);
 	return error;
 }