diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
index dc398c6b7528..7d09256aca72 100644
--- a/drivers/ptp/ptp_sysfs.c
+++ b/drivers/ptp/ptp_sysfs.c
@@ -80,13 +80,17 @@ static ssize_t extts_fifo_show(struct device *dev,
 	size_t qcnt;
 	int cnt = 0;
 
+	spin_lock_irqsave(&ptp->tsevqs_lock, flags);
 	cnt = list_count_nodes(&ptp->tsevqs);
-	if (cnt <= 0)
+	if (cnt <= 0) {
+		spin_unlock_irqrestore(&ptp->tsevqs_lock, flags);
 		goto out;
+	}
 
 	/* The sysfs fifo will always draw from the fist queue */
 	queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue,
 				 qlist);
+	spin_unlock_irqrestore(&ptp->tsevqs_lock, flags);
 
 	memset(&event, 0, sizeof(event));
 	spin_lock_irqsave(&queue->lock, flags);