diff --git a/drivers/rpmsg/mtk_rpmsg.c b/drivers/rpmsg/mtk_rpmsg.c
index 5b4404b8be4c75..d1213c33da204d 100644
--- a/drivers/rpmsg/mtk_rpmsg.c
+++ b/drivers/rpmsg/mtk_rpmsg.c
@@ -234,7 +234,9 @@ static void mtk_register_device_work_function(struct work_struct *register_work)
 		if (info->registered)
 			continue;
 
+		mutex_unlock(&subdev->channels_lock);
 		ret = mtk_rpmsg_register_device(subdev, &info->info);
+		mutex_lock(&subdev->channels_lock);
 		if (ret) {
 			dev_err(&pdev->dev, "Can't create rpmsg_device\n");
 			continue;