diff --git a/bsd-core/drm_vm.c b/bsd-core/drm_vm.c
index 8ee49a2..6323819 100644
--- a/bsd-core/drm_vm.c
+++ b/bsd-core/drm_vm.c
@@ -36,16 +36,15 @@ int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr,
 	drm_local_map_t *map;
 	enum drm_map_type type;
 	vm_paddr_t phys;
+	int error;
 
-	DRM_LOCK();
-	TAILQ_FOREACH(file_priv, &dev->files, link)
-		if (file_priv->pid == curthread->td_proc->p_pid &&
-		    file_priv->uid == curthread->td_ucred->cr_svuid &&
-		    file_priv->authenticated == 1)
-			break;
-	DRM_UNLOCK();
+	error = devfs_get_cdevpriv((void **)&file_priv);
+	if (error == ENOENT) {
+		DRM_ERROR("Could not find authenticator!\n");
+		return EINVAL;
+	}
 
-	if (!file_priv)
+	if (file_priv && !file_priv->authenticated)
 		return EACCES;
 
 	if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {