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usb: dwc3: gadget: always decrement by 1

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

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-08-24 14:40:13 +03:00
parent 696fe69d7e
commit 6f8245b4e3
1 changed files with 1 additions and 4 deletions
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5
drivers/usb/dwc3/gadget.c
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@ -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;
}