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()
472 static int __klp_disable_patch(struct klp_patch *patch)  in __klp_disable_patch()  argument
477 	if (!list_is_last(&patch->list, &klp_patches) &&  in __klp_disable_patch()
478 	    list_next_entry(patch, list)->state == KLP_ENABLED)  in __klp_disable_patch()
481 	pr_notice("disabling patch '%s'\n", patch->mod->name);  in __klp_disable_patch()
483 	klp_for_each_object(patch, obj) {  in __klp_disable_patch()
488 	patch->state = KLP_DISABLED;  in __klp_disable_patch()
501 int klp_disable_patch(struct klp_patch *patch)  in klp_disable_patch()  argument
507 	if (!klp_is_patch_registered(patch)) {  in klp_disable_patch()
512 	if (patch->state == KLP_DISABLED) {  in klp_disable_patch()
517 	ret = __klp_disable_patch(patch);  in klp_disable_patch()
525 static int __klp_enable_patch(struct klp_patch *patch)  in __klp_enable_patch()  argument
530 	if (WARN_ON(patch->state != KLP_DISABLED))  in __klp_enable_patch()
534 	if (patch->list.prev != &klp_patches &&  in __klp_enable_patch()
535 	    list_prev_entry(patch, list)->state == KLP_DISABLED)  in __klp_enable_patch()
541 	pr_notice("enabling patch '%s'\n", patch->mod->name);  in __klp_enable_patch()
543 	klp_for_each_object(patch, obj) {  in __klp_enable_patch()
552 	patch->state = KLP_ENABLED;  in __klp_enable_patch()
557 	WARN_ON(__klp_disable_patch(patch));  in __klp_enable_patch()
570 int klp_enable_patch(struct klp_patch *patch)  in klp_enable_patch()  argument
576 	if (!klp_is_patch_registered(patch)) {  in klp_enable_patch()
581 	ret = __klp_enable_patch(patch);  in klp_enable_patch()
602 	struct klp_patch *patch;  in enabled_store()  local
613 	patch = container_of(kobj, struct klp_patch, kobj);  in enabled_store()
617 	if (val == patch->state) {  in enabled_store()
624 		ret = __klp_enable_patch(patch);  in enabled_store()
628 		ret = __klp_disable_patch(patch);  in enabled_store()
645 	struct klp_patch *patch;  in enabled_show()  local
647 	patch = container_of(kobj, struct klp_patch, kobj);  in enabled_show()
648 	return snprintf(buf, PAGE_SIZE-1, "%d\n", patch->state);  in enabled_show()
717 static void klp_free_objects_limited(struct klp_patch *patch,  in klp_free_objects_limited()  argument
722 	for (obj = patch->objs; obj->funcs && obj != limit; obj++) {  in klp_free_objects_limited()
728 static void klp_free_patch(struct klp_patch *patch)  in klp_free_patch()  argument
730 	klp_free_objects_limited(patch, NULL);  in klp_free_patch()
731 	if (!list_empty(&patch->list))  in klp_free_patch()
732 		list_del(&patch->list);  in klp_free_patch()
733 	kobject_put(&patch->kobj);  in klp_free_patch()
746 static int klp_init_object_loaded(struct klp_patch *patch,  in klp_init_object_loaded()  argument
753 		ret = klp_write_object_relocations(patch->mod, obj);  in klp_init_object_loaded()
767 static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)  in klp_init_object()  argument
783 				   &patch->kobj, "%s", name);  in klp_init_object()
794 		ret = klp_init_object_loaded(patch, obj);  in klp_init_object()
807 static int klp_init_patch(struct klp_patch *patch)  in klp_init_patch()  argument
812 	if (!patch->objs)  in klp_init_patch()
817 	patch->state = KLP_DISABLED;  in klp_init_patch()
819 	ret = kobject_init_and_add(&patch->kobj, &klp_ktype_patch,  in klp_init_patch()
820 				   klp_root_kobj, "%s", patch->mod->name);  in klp_init_patch()
824 	klp_for_each_object(patch, obj) {  in klp_init_patch()
825 		ret = klp_init_object(patch, obj);  in klp_init_patch()
830 	list_add_tail(&patch->list, &klp_patches);  in klp_init_patch()
837 	klp_free_objects_limited(patch, obj);  in klp_init_patch()
838 	kobject_put(&patch->kobj);  in klp_init_patch()
852 int klp_unregister_patch(struct klp_patch *patch)  in klp_unregister_patch()  argument
858 	if (!klp_is_patch_registered(patch)) {  in klp_unregister_patch()
863 	if (patch->state == KLP_ENABLED) {  in klp_unregister_patch()
868 	klp_free_patch(patch);  in klp_unregister_patch()
885 int klp_register_patch(struct klp_patch *patch)  in klp_register_patch()  argument
892 	if (!patch || !patch->mod)  in klp_register_patch()
902 	if (!try_module_get(patch->mod))  in klp_register_patch()
905 	ret = klp_init_patch(patch);  in klp_register_patch()
907 		module_put(patch->mod);  in klp_register_patch()
913 static int klp_module_notify_coming(struct klp_patch *patch,  in klp_module_notify_coming()  argument
916 	struct module *pmod = patch->mod;  in klp_module_notify_coming()
920 	ret = klp_init_object_loaded(patch, obj);  in klp_module_notify_coming()
927 	if (patch->state == KLP_DISABLED)  in klp_module_notify_coming()
940 static void klp_module_notify_going(struct klp_patch *patch,  in klp_module_notify_going()  argument
943 	struct module *pmod = patch->mod;  in klp_module_notify_going()
946 	if (patch->state == KLP_DISABLED)  in klp_module_notify_going()
963 	struct klp_patch *patch;  in klp_module_notify()  local
980 	list_for_each_entry(patch, &klp_patches, list) {  in klp_module_notify()
981 		klp_for_each_object(patch, obj) {  in klp_module_notify()
987 				ret = klp_module_notify_coming(patch, obj);  in klp_module_notify()
991 						patch->mod->name);  in klp_module_notify()
994 				klp_module_notify_going(patch, obj);  in klp_module_notify()