diff --git a/sound/drivers/pcmtest.c b/sound/drivers/pcmtest.c
index 186e982d42e1..fea9580593e6 100644
--- a/sound/drivers/pcmtest.c
+++ b/sound/drivers/pcmtest.c
@@ -345,6 +345,7 @@ static void timer_timeout(struct timer_list *data)
 	v_iter = timer_container_of(v_iter, data, timer_instance);
 	substream = v_iter->substream;
 
+	guard(pcm_stream_lock_irqsave)(substream);
 	if (v_iter->suspend)
 		return;
 
@@ -358,7 +359,7 @@ static void timer_timeout(struct timer_list *data)
 	v_iter->period_pos += v_iter->b_rw;
 	if (v_iter->period_pos >= v_iter->period_bytes) {
 		v_iter->period_pos %= v_iter->period_bytes;
-		snd_pcm_period_elapsed(substream);
+		snd_pcm_period_elapsed_under_stream_lock(substream);
 	}
 
 	if (!v_iter->suspend)