--- linux-2.6.33/fs/dcache.c.org	2011-04-04 08:20:20.382107296 +0200
+++ linux-2.6.33/fs/dcache.c	2011-04-15 08:23:45.530530995 +0200
@@ -2123,7 +2123,7 @@
  */
 void dentry_update_name_case(struct dentry *dentry, struct qstr *name)
 {
-	BUG_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
+	BUG_ON(!mutex_is_locked(&dentry->d_parent->d_inode->i_mutex));
 	BUG_ON(dentry->d_name.len != name->len); /* d_lookup gives this */
 
 	spin_lock(&dentry->d_lock);