From: Felipe Balbi <felipe.balbi@linux.intel.com>
Date: Wed, 24 Aug 2016 11:40:13 +0000 (+0300)
Subject: usb: dwc3: gadget: always decrement by 1
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6f8245b4e37c;p=linux-beck.git

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 122e64df2f4d..7a8d3d822b54 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;
 }