usb: dwc3: gadget: simplify dwc3_ep_prev_trb()



We always need to decrement our index by at least
one. Simplify the implementation by using a
temporary local variable and making sure that we
will always decrement one extra if tmp == 0.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

parent 737f1ae2

drivers/usb/dwc3/gadget.c

+5 −5

Original line number	Diff line number	Diff line
		@@ -845,12 +845,12 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
		*/
		static struct dwc3_trb dwc3_ep_prev_trb(struct dwc3_ep dep, u8 index)
		{
		if (!index)
		index = DWC3_TRB_NUM - 2;
		else
		index = dep->trb_enqueue - 1;
		u8 tmp = index;

		if (!tmp)
		tmp = DWC3_TRB_NUM - 1;

		return &dep->trb_pool[index];
		return &dep->trb_pool[tmp - 1];
		}

		static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)