diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index b4aa8daa4773..2959970dd10e 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -1606,6 +1606,7 @@ static void pt_event_stop(struct perf_event *event, int mode)
 	 * see comment in intel_pt_interrupt().
 	 */
 	WRITE_ONCE(pt->handle_nmi, 0);
+	barrier();
 
 	pt_config_stop(event);
 
@@ -1657,11 +1658,10 @@ static long pt_event_snapshot_aux(struct perf_event *event,
 		return 0;
 
 	/*
-	 * Here, handle_nmi tells us if the tracing is on
+	 * There is no PT interrupt in this mode, so stop the trace and it will
+	 * remain stopped while the buffer is copied.
 	 */
-	if (READ_ONCE(pt->handle_nmi))
-		pt_config_stop(event);
-
+	pt_config_stop(event);
 	pt_read_offset(buf);
 	pt_update_head(pt);
 
@@ -1673,11 +1673,10 @@ static long pt_event_snapshot_aux(struct perf_event *event,
 	ret = perf_output_copy_aux(&pt->handle, handle, from, to);
 
 	/*
-	 * If the tracing was on when we turned up, restart it.
-	 * Compiler barrier not needed as we couldn't have been
-	 * preempted by anything that touches pt->handle_nmi.
+	 * Here, handle_nmi tells us if the tracing was on.
+	 * If the tracing was on, restart it.
 	 */
-	if (pt->handle_nmi)
+	if (READ_ONCE(pt->handle_nmi))
 		pt_config_start(event);
 
 	return ret;