Commit 9d7aba77 authored by John Youn's avatar John Youn Committed by Felipe Balbi

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

This reverts commit 6f8245b4 ("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: default avatarJohn Youn <johnyoun@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent c6935931
...@@ -884,9 +884,12 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep) ...@@ -884,9 +884,12 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
return DWC3_TRB_NUM - 1; 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); trbs_left &= (DWC3_TRB_NUM - 1);
if (dep->trb_dequeue < dep->trb_enqueue)
trbs_left--;
return trbs_left; return trbs_left;
} }
......
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