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Revert "usb: dwc3: gadget: always decrement by 1" 

This reverts commit 6f8245b4e3 ("usb: dwc3: gadget: always decrement
by 1").

We can't always decrement this value.

We should decrement only if the calculation of free slots results in a
LINK TRB being among one of the free slots (dequeue < enqueue).

Otherwise, if the LINK TRB is not among the free slots then it should
not be decremented.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
John Youn 2016-08-26 18:43:01 -07:00 committed by Felipe Balbi
parent c6935931c1
commit 9d7aba7786
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/dwc3/gadget.c
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@ -884,9 +884,12 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
return DWC3_TRB_NUM - 1;
}
trbs_left = dep->trb_dequeue - dep->trb_enqueue - 1;
trbs_left = dep->trb_dequeue - dep->trb_enqueue;
trbs_left &= (DWC3_TRB_NUM - 1);
if (dep->trb_dequeue < dep->trb_enqueue)
trbs_left--;
return trbs_left;
}