diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 1804599..a310266 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -845,12 +845,12 @@
  */
 static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
 {
-	if (!index)
-		index = DWC3_TRB_NUM - 2;
-	else
-		index = dep->trb_enqueue - 1;
+	u8 tmp = index;
 
-	return &dep->trb_pool[index];
+	if (!tmp)
+		tmp = DWC3_TRB_NUM - 1;
+
+	return &dep->trb_pool[tmp - 1];
 }
 
 static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)