From 6f8245b4e37c2072d3daea24e19dbc0162ffd22c Mon Sep 17 00:00:00 2001
From: Felipe Balbi <felipe.balbi@linux.intel.com>
Date: Wed, 24 Aug 2016 14:40:13 +0300
Subject: usb: dwc3: gadget: always decrement by 1

We need to decrement in both cases (enq > deq and
enq < deq)

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 122e64d..7a8d3d8 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -884,12 +884,9 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
 		return DWC3_TRB_NUM - 1;
 	}
 
-	trbs_left = dep->trb_dequeue - dep->trb_enqueue;
+	trbs_left = dep->trb_dequeue - dep->trb_enqueue - 1;
 	trbs_left &= (DWC3_TRB_NUM - 1);
 
-	if (dep->trb_dequeue < dep->trb_enqueue)
-		trbs_left--;
-
 	return trbs_left;
 }
 
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