diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
index 527cdf2c1..75354f2db 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
@@ -1456,7 +1456,7 @@ int xhci_event_wait(struct xhci_host *xhci,
  * @v value     Value send to doorbell
  */
 static inline void xhci_doorbell ( struct xhci_host *xhci, uint32_t slotid, uint32_t value ) {
-//	DSB();
+	DSB();
 	BARRIER();
 	writel ( value, xhci->db + slotid * XHCI_REG_DB_SIZE ); /* bit[7:0] db target, is ep_id */
 }
@@ -2702,4 +2702,4 @@ void xhci_event_process(struct xhci_host *xhci) {
    }
 
    return;    
-}
\ No newline at end of file
+}