diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
index 594d80434004..abbb58202239 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -546,7 +546,9 @@ static void rvin_parallel_notify_unbind(struct v4l2_async_notifier *notifier,
 
 	vin_dbg(vin, "unbind parallel subdev %s\n", subdev->name);
 
+	mutex_lock(&vin->lock);
 	rvin_parallel_subdevice_detach(vin);
+	mutex_unlock(&vin->lock);
 }
 
 static int rvin_parallel_notify_bound(struct v4l2_async_notifier *notifier,
@@ -556,7 +558,9 @@ static int rvin_parallel_notify_bound(struct v4l2_async_notifier *notifier,
 	struct rvin_dev *vin = v4l2_dev_to_vin(notifier->v4l2_dev);
 	int ret;
 
+	mutex_lock(&vin->lock);
 	ret = rvin_parallel_subdevice_attach(vin, subdev);
+	mutex_unlock(&vin->lock);
 	if (ret)
 		return ret;
 
@@ -664,6 +668,7 @@ static int rvin_group_notify_complete(struct v4l2_async_notifier *notifier)
 	}
 
 	/* Create all media device links between VINs and CSI-2's. */
+	mutex_lock(&vin->group->lock);
 	for (route = vin->info->routes; route->mask; route++) {
 		struct media_pad *source_pad, *sink_pad;
 		struct media_entity *source, *sink;
@@ -699,6 +704,7 @@ static int rvin_group_notify_complete(struct v4l2_async_notifier *notifier)
 			break;
 		}
 	}
+	mutex_unlock(&vin->group->lock);
 
 	return ret;
 }
@@ -714,6 +720,8 @@ static void rvin_group_notify_unbind(struct v4l2_async_notifier *notifier,
 		if (vin->group->vin[i])
 			rvin_v4l2_unregister(vin->group->vin[i]);
 
+	mutex_lock(&vin->group->lock);
+
 	for (i = 0; i < RVIN_CSI_MAX; i++) {
 		if (vin->group->csi[i].fwnode != asd->match.fwnode)
 			continue;
@@ -721,6 +729,8 @@ static void rvin_group_notify_unbind(struct v4l2_async_notifier *notifier,
 		vin_dbg(vin, "Unbind CSI-2 %s from slot %u\n", subdev->name, i);
 		break;
 	}
+
+	mutex_unlock(&vin->group->lock);
 }
 
 static int rvin_group_notify_bound(struct v4l2_async_notifier *notifier,
@@ -730,6 +740,8 @@ static int rvin_group_notify_bound(struct v4l2_async_notifier *notifier,
 	struct rvin_dev *vin = v4l2_dev_to_vin(notifier->v4l2_dev);
 	unsigned int i;
 
+	mutex_lock(&vin->group->lock);
+
 	for (i = 0; i < RVIN_CSI_MAX; i++) {
 		if (vin->group->csi[i].fwnode != asd->match.fwnode)
 			continue;
@@ -738,6 +750,8 @@ static int rvin_group_notify_bound(struct v4l2_async_notifier *notifier,
 		break;
 	}
 
+	mutex_unlock(&vin->group->lock);
+
 	return 0;
 }
 
@@ -752,6 +766,7 @@ static int rvin_mc_parse_of_endpoint(struct device *dev,
 				     struct v4l2_async_subdev *asd)
 {
 	struct rvin_dev *vin = dev_get_drvdata(dev);
+	int ret = 0;
 
 	if (vep->base.port != 1 || vep->base.id >= RVIN_CSI_MAX)
 		return -EINVAL;
@@ -762,38 +777,48 @@ static int rvin_mc_parse_of_endpoint(struct device *dev,
 		return -ENOTCONN;
 	}
 
+	mutex_lock(&vin->group->lock);
+
 	if (vin->group->csi[vep->base.id].fwnode) {
 		vin_dbg(vin, "OF device %pOF already handled\n",
 			to_of_node(asd->match.fwnode));
-		return -ENOTCONN;
+		ret = -ENOTCONN;
+		goto out;
 	}
 
 	vin->group->csi[vep->base.id].fwnode = asd->match.fwnode;
 
 	vin_dbg(vin, "Add group OF device %pOF to slot %u\n",
 		to_of_node(asd->match.fwnode), vep->base.id);
+out:
+	mutex_unlock(&vin->group->lock);
 
-	return 0;
+	return ret;
 }
 
 static int rvin_mc_parse_of_graph(struct rvin_dev *vin)
 {
-	unsigned int count = 0;
+	unsigned int count = 0, vin_mask = 0;
 	unsigned int i;
 	int ret;
 
 	mutex_lock(&vin->group->lock);
 
 	/* If not all VIN's are registered don't register the notifier. */
-	for (i = 0; i < RCAR_VIN_NUM; i++)
-		if (vin->group->vin[i])
+	for (i = 0; i < RCAR_VIN_NUM; i++) {
+		if (vin->group->vin[i]) {
 			count++;
+			vin_mask |= BIT(i);
+		}
+	}
 
 	if (vin->group->count != count) {
 		mutex_unlock(&vin->group->lock);
 		return 0;
 	}
 
+	mutex_unlock(&vin->group->lock);
+
 	v4l2_async_notifier_init(&vin->group->notifier);
 
 	/*
@@ -802,21 +827,17 @@ static int rvin_mc_parse_of_graph(struct rvin_dev *vin)
 	 * will only be registered once with the group notifier.
 	 */
 	for (i = 0; i < RCAR_VIN_NUM; i++) {
-		if (!vin->group->vin[i])
+		if (!(vin_mask & BIT(i)))
 			continue;
 
 		ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
 				vin->group->vin[i]->dev, &vin->group->notifier,
 				sizeof(struct v4l2_async_subdev), 1,
 				rvin_mc_parse_of_endpoint);
-		if (ret) {
-			mutex_unlock(&vin->group->lock);
+		if (ret)
 			return ret;
-		}
 	}
 
-	mutex_unlock(&vin->group->lock);
-
 	if (list_empty(&vin->group->notifier.asd_list))
 		return 0;