diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 9bc8ce8c5676..04bb94c29f58 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -7473,6 +7473,14 @@ int ring_buffer_subbuf_order_set(struct trace_buffer *buffer, int order)
 
 	old_capacity = rb_subbuf_capacity(buffer);
 
+	/* The mmap fast path reads subbuf_order without buffer->mutex. */
+	for_each_buffer_cpu(buffer, cpu) {
+		if (!cpumask_test_cpu(cpu, buffer->cpumask))
+			continue;
+		if (atomic_read(&buffer->buffers[cpu]->resize_disabled))
+			return -EBUSY;
+	}
+
 	atomic_inc(&buffer->record_disabled);
 
 	/* Make sure all commits have finished */