diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 9b07ad9eb284..741b16b54d90 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c

@@ -1379,6 +1379,9 @@ static int __ftrace_set_clr_event(struct trace_array *tr, const char *match,
 {
 	int ret;
 
+	if (trace_array_is_readonly(tr))
+		return -EPERM;
+
 	mutex_lock(&event_mutex);
 	ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set, mod);
 	mutex_unlock(&event_mutex);

@@ -2817,8 +2820,8 @@ event_subsystem_dir(struct trace_array *tr, const char *name,
 	} else
 		__get_system(system);
 
-	/* ftrace only has directories no files */
-	if (strcmp(name, "ftrace") == 0)
+	/* ftrace only has directories no files, readonly instance too. */
+	if (strcmp(name, "ftrace") == 0 || trace_array_is_readonly(tr))
 		nr_entries = 0;
 	else
 		nr_entries = ARRAY_SIZE(system_entries);

@@ -2979,7 +2982,6 @@ event_create_dir(struct eventfs_inode *parent, struct trace_event_file *file)
 	struct eventfs_inode *e_events;
 	struct eventfs_inode *ei;
 	const char *name;
-	int nr_entries;
 	int ret;
 	static struct eventfs_entry event_entries[] = {
 		{

@@ -3024,6 +3026,18 @@ event_create_dir(struct eventfs_inode *parent, struct trace_event_file *file)
 		},
 #endif
 	};
+	static struct eventfs_entry event_ro_entries[] = {
+		{
+			.name		= "format",
+			.callback	= event_callback,
+		},
+#ifdef CONFIG_PERF_EVENTS
+		{
+			.name		= "id",
+			.callback	= event_callback,
+		},
+#endif
+	};