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UPSTREAM: usb: dwc3: gadget: Account for link TRB in TRBs left

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The TRBs left calculation didn't account for the link TRB taking up one
spot.

If the trb_dequeue < trb_enqueue, then the result includes the link
TRB slot so it must be adjusted.

Change-Id: If03f89ea1f523b4bce1b5f096ae81aebc891c63f
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
(cherry picked from commit 7d0a038b13)
This commit is contained in:
John Youn
2016-05-19 17:26:15 -07:00
committed by Huang, Tao
parent 1b10886a49
commit bf8f5fbf04
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/dwc3/gadget.c
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@@ -868,6 +868,9 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
trbs_left = dep->trb_dequeue - dep->trb_enqueue;
trbs_left %= DWC3_TRB_NUM;
if (dep->trb_dequeue < dep->trb_enqueue)
trbs_left--;
return trbs_left;
}