[PATCH 4/4] usb: dwc3: gadget: always decrement by 1

[Felipe Balbi]

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

Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
---
 drivers/usb/dwc3/gadget.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 594e82595634..e4ef9ed1a143 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;
 }
 
-- 
2.9.1

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