Merge branch 'linus' into xen-64bit

1 files changed, 13 insertions, 3 deletions

diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index 2a731ef5f305..0004d18c40ac 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -77,12 +77,15 @@ static int create_link(struct config_item *parent_item,
         sl = kmalloc(sizeof(struct configfs_symlink), GFP_KERNEL);
         if (sl) {
                 sl->sl_target = config_item_get(item);
-                /* FIXME: needs a lock, I'd bet */
+                spin_lock(&configfs_dirent_lock);
                 list_add(&sl->sl_list, &target_sd->s_links);
+                spin_unlock(&configfs_dirent_lock);
                 ret = configfs_create_link(sl, parent_item->ci_dentry,
                                            dentry);
                 if (ret) {
+                        spin_lock(&configfs_dirent_lock);
                         list_del_init(&sl->sl_list);
+                        spin_unlock(&configfs_dirent_lock);
                         config_item_put(item);
                         kfree(sl);
                 }
@@ -137,8 +140,12 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna
                 goto out_put;
 
         ret = type->ct_item_ops->allow_link(parent_item, target_item);
-        if (!ret)
+        if (!ret) {
                 ret = create_link(parent_item, target_item, dentry);
+                if (ret && type->ct_item_ops->drop_link)
+                        type->ct_item_ops->drop_link(parent_item,
+                                                     target_item);
+        }
 
         config_item_put(target_item);
         path_put(&nd.path);
@@ -169,7 +176,9 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry)
         parent_item = configfs_get_config_item(dentry->d_parent);
         type = parent_item->ci_type;
 
+        spin_lock(&configfs_dirent_lock);
         list_del_init(&sd->s_sibling);
+        spin_unlock(&configfs_dirent_lock);
         configfs_drop_dentry(sd, dentry->d_parent);
         dput(dentry);
         configfs_put(sd);
@@ -184,8 +193,9 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry)
                 type->ct_item_ops->drop_link(parent_item,
                                                sl->sl_target);
 
-        /* FIXME: Needs lock */
+        spin_lock(&configfs_dirent_lock);
         list_del_init(&sl->sl_list);
+        spin_unlock(&configfs_dirent_lock);
 
         /* Put reference from create_link() */
         config_item_put(sl->sl_target);