kernel/module.c: suppress warning about unused nowarn variable

This patch fix the following warning:
kernel/module.c: In function 'add_usage_links':
kernel/module.c:1653:6: warning: variable 'nowarn' set but not used [-Wunused-but-set-variable]

[jeyu: folded in first patch since it only swapped the function order
so that del_usage_links can be called from add_usage_links]
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>

diff --git a/kernel/module.c b/kernel/module.c
index 3803449..f546d57 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1666,31 +1666,36 @@ static inline void remove_notes_attrs(struct module *mod)
 }
 #endif /* CONFIG_KALLSYMS */
 
-static void add_usage_links(struct module *mod)
+static void del_usage_links(struct module *mod)
 {
 #ifdef CONFIG_MODULE_UNLOAD
        struct module_use *use;
-       int nowarn;
 
        mutex_lock(&module_mutex);
-       list_for_each_entry(use, &mod->target_list, target_list) {
-               nowarn = sysfs_create_link(use->target->holders_dir,
-                                          &mod->mkobj.kobj, mod->name);
-       }
+       list_for_each_entry(use, &mod->target_list, target_list)
+               sysfs_remove_link(use->target->holders_dir, mod->name);
        mutex_unlock(&module_mutex);
 #endif
 }
 
-static void del_usage_links(struct module *mod)
+static int add_usage_links(struct module *mod)
 {
+       int ret = 0;
 #ifdef CONFIG_MODULE_UNLOAD
        struct module_use *use;
 
        mutex_lock(&module_mutex);
-       list_for_each_entry(use, &mod->target_list, target_list)
-               sysfs_remove_link(use->target->holders_dir, mod->name);
+       list_for_each_entry(use, &mod->target_list, target_list) {
+               ret = sysfs_create_link(use->target->holders_dir,
+                                       &mod->mkobj.kobj, mod->name);
+               if (ret)
+                       break;
+       }
        mutex_unlock(&module_mutex);
+       if (ret)
+               del_usage_links(mod);
 #endif
+       return ret;
 }
 
 static int module_add_modinfo_attrs(struct module *mod)
@@ -1801,13 +1806,18 @@ static int mod_sysfs_setup(struct module *mod,
        if (err)
                goto out_unreg_param;
 
-       add_usage_links(mod);
+       err = add_usage_links(mod);
+       if (err)
+               goto out_unreg_modinfo_attrs;
+
        add_sect_attrs(mod, info);
        add_notes_attrs(mod, info);
 
        kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
        return 0;
 
+out_unreg_modinfo_attrs:
+       module_remove_modinfo_attrs(mod);
 out_unreg_param:
        module_param_sysfs_remove(mod);
 out_unreg_holders: