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

drivers/usb/dwc3/gadget.c

+4 −1
Original line number Diff line number Diff line
@@ -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;

}