118 static bool klp_is_patch_registered(struct klp_patch *patch)  in klp_is_patch_registered()  argument
123 		if (mypatch == patch)  in klp_is_patch_registered()
463 static int __klp_disable_patch(struct klp_patch *patch)  in __klp_disable_patch()  argument
468 	if (!list_is_last(&patch->list, &klp_patches) &&  in __klp_disable_patch()
469 	    list_next_entry(patch, list)->state == KLP_ENABLED)  in __klp_disable_patch()
472 	pr_notice("disabling patch '%s'\n", patch->mod->name);  in __klp_disable_patch()
474 	for (obj = patch->objs; obj->funcs; obj++) {  in __klp_disable_patch()
479 	patch->state = KLP_DISABLED;  in __klp_disable_patch()
492 int klp_disable_patch(struct klp_patch *patch)  in klp_disable_patch()  argument
498 	if (!klp_is_patch_registered(patch)) {  in klp_disable_patch()
503 	if (patch->state == KLP_DISABLED) {  in klp_disable_patch()
508 	ret = __klp_disable_patch(patch);  in klp_disable_patch()
516 static int __klp_enable_patch(struct klp_patch *patch)  in __klp_enable_patch()  argument
521 	if (WARN_ON(patch->state != KLP_DISABLED))  in __klp_enable_patch()
525 	if (patch->list.prev != &klp_patches &&  in __klp_enable_patch()
526 	    list_prev_entry(patch, list)->state == KLP_DISABLED)  in __klp_enable_patch()
532 	pr_notice("enabling patch '%s'\n", patch->mod->name);  in __klp_enable_patch()
534 	for (obj = patch->objs; obj->funcs; obj++) {  in __klp_enable_patch()
543 	patch->state = KLP_ENABLED;  in __klp_enable_patch()
548 	WARN_ON(__klp_disable_patch(patch));  in __klp_enable_patch()
561 int klp_enable_patch(struct klp_patch *patch)  in klp_enable_patch()  argument
567 	if (!klp_is_patch_registered(patch)) {  in klp_enable_patch()
572 	ret = __klp_enable_patch(patch);  in klp_enable_patch()
593 	struct klp_patch *patch;  in enabled_store()  local
604 	patch = container_of(kobj, struct klp_patch, kobj);  in enabled_store()
608 	if (val == patch->state) {  in enabled_store()
615 		ret = __klp_enable_patch(patch);  in enabled_store()
619 		ret = __klp_disable_patch(patch);  in enabled_store()
636 	struct klp_patch *patch;  in enabled_show()  local
638 	patch = container_of(kobj, struct klp_patch, kobj);  in enabled_show()
639 	return snprintf(buf, PAGE_SIZE-1, "%d\n", patch->state);  in enabled_show()
699 static void klp_free_objects_limited(struct klp_patch *patch,  in klp_free_objects_limited()  argument
704 	for (obj = patch->objs; obj->funcs && obj != limit; obj++) {  in klp_free_objects_limited()
710 static void klp_free_patch(struct klp_patch *patch)  in klp_free_patch()  argument
712 	klp_free_objects_limited(patch, NULL);  in klp_free_patch()
713 	if (!list_empty(&patch->list))  in klp_free_patch()
714 		list_del(&patch->list);  in klp_free_patch()
715 	kobject_put(&patch->kobj);  in klp_free_patch()
728 static int klp_init_object_loaded(struct klp_patch *patch,  in klp_init_object_loaded()  argument
735 		ret = klp_write_object_relocations(patch->mod, obj);  in klp_init_object_loaded()
749 static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)  in klp_init_object()  argument
764 	obj->kobj = kobject_create_and_add(name, &patch->kobj);  in klp_init_object()
775 		ret = klp_init_object_loaded(patch, obj);  in klp_init_object()
788 static int klp_init_patch(struct klp_patch *patch)  in klp_init_patch()  argument
793 	if (!patch->objs)  in klp_init_patch()
798 	patch->state = KLP_DISABLED;  in klp_init_patch()
800 	ret = kobject_init_and_add(&patch->kobj, &klp_ktype_patch,  in klp_init_patch()
801 				   klp_root_kobj, "%s", patch->mod->name);  in klp_init_patch()
805 	for (obj = patch->objs; obj->funcs; obj++) {  in klp_init_patch()
806 		ret = klp_init_object(patch, obj);  in klp_init_patch()
811 	list_add_tail(&patch->list, &klp_patches);  in klp_init_patch()
818 	klp_free_objects_limited(patch, obj);  in klp_init_patch()
819 	kobject_put(&patch->kobj);  in klp_init_patch()
833 int klp_unregister_patch(struct klp_patch *patch)  in klp_unregister_patch()  argument
839 	if (!klp_is_patch_registered(patch)) {  in klp_unregister_patch()
844 	if (patch->state == KLP_ENABLED) {  in klp_unregister_patch()
849 	klp_free_patch(patch);  in klp_unregister_patch()
866 int klp_register_patch(struct klp_patch *patch)  in klp_register_patch()  argument
873 	if (!patch || !patch->mod)  in klp_register_patch()
883 	if (!try_module_get(patch->mod))  in klp_register_patch()
886 	ret = klp_init_patch(patch);  in klp_register_patch()
888 		module_put(patch->mod);  in klp_register_patch()
894 static void klp_module_notify_coming(struct klp_patch *patch,  in klp_module_notify_coming()  argument
897 	struct module *pmod = patch->mod;  in klp_module_notify_coming()
901 	ret = klp_init_object_loaded(patch, obj);  in klp_module_notify_coming()
905 	if (patch->state == KLP_DISABLED)  in klp_module_notify_coming()
920 static void klp_module_notify_going(struct klp_patch *patch,  in klp_module_notify_going()  argument
923 	struct module *pmod = patch->mod;  in klp_module_notify_going()
926 	if (patch->state == KLP_DISABLED)  in klp_module_notify_going()
942 	struct klp_patch *patch;  in klp_module_notify()  local
959 	list_for_each_entry(patch, &klp_patches, list) {  in klp_module_notify()
960 		for (obj = patch->objs; obj->funcs; obj++) {  in klp_module_notify()
966 				klp_module_notify_coming(patch, obj);  in klp_module_notify()
968 				klp_module_notify_going(patch, obj);  in klp_module_notify()