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usb: dwc3: gadget: simplify dwc3_ep_prev_trb()

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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>
This commit is contained in:
Felipe Balbi 2016-08-11 12:26:59 +03:00
parent 737f1ae255
commit 45438a0cd9
1 changed files with 5 additions and 5 deletions
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10
drivers/usb/dwc3/gadget.c
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@ -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;
return &dep->trb_pool[index];
if (!tmp)
tmp = DWC3_TRB_NUM - 1;
return &dep->trb_pool[tmp - 1];
}
static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)