usb: dwc3: gadget: Don't prepare TRBs if no space

If trbs_left == 0, we don't have any space left in the TRB ring so don't
prepare anything.

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

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 6408f7f..663ea9e 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -942,6 +942,8 @@ static void dwc3_prepare_trbs(struct dwc3_ep *dep)
        BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
 
        trbs_left = dwc3_calc_trbs_left(dep);
+       if (!trbs_left)
+               return;
 
        list_for_each_entry_safe(req, n, &dep->pending_list, list) {
                if (req->request.num_mapped_sgs > 0)