--- zzzz-none-000/linux-4.4.60/sound/core/pcm_timer.c	2017-04-08 07:53:53.000000000 +0000
+++ jet-2400-727/linux-4.4.60/sound/core/pcm_timer.c	2021-03-17 14:36:41.000000000 +0000
@@ -65,9 +65,16 @@
 static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer)
 {
 	struct snd_pcm_substream *substream;
+	unsigned long ret = 0, flags = 0;
 	
 	substream = timer->private_data;
-	return substream->runtime ? substream->runtime->timer_resolution : 0;
+	spin_lock_irqsave(&substream->runtime_lock, flags);
+	if (substream->runtime)
+		ret = substream->runtime->timer_resolution;
+	else
+		ret = 0;
+	spin_unlock_irqrestore(&substream->runtime_lock, flags);
+	return ret;
 }
 
 static int snd_pcm_timer_start(struct snd_timer * timer)