diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index 8c351f193..f7db37243 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -4432,7 +4432,8 @@ static int vdev_sysfs_process_get_filename(struct scst_sysfs_work_item *work)
 	 * under scst_vdisk_mutex.
 	 */
 	while (!mutex_trylock(&scst_vdisk_mutex)) {
-		if ((volatile bool)(dev->dev_unregistering)) {
+		smp_mb();
+		if (dev->dev_unregistering) {
 			TRACE_MGMT_DBG("Skipping being unregistered dev %s",
 				dev->virt_name);
 			res = -ENOENT;