usb: dwc3: gadget: stop kicking if we run out of space

In case our TRB ring is full, we can avoid trying to
kick transfers which won't start and just add requests
to the queue.

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 104b145f506de76a54f573eb420cc423954f0861..37a86522fa881f4887a60fce1b3ca01c8cba5755 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1082,6 +1082,9 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
                return 0;
        }
 
+       if (!dwc3_calc_trbs_left(dep))
+               return 0;
+
        ret = __dwc3_gadget_kick_transfer(dep, 0);
        if (ret && ret != -EBUSY)
                dwc3_trace(trace_dwc3_gadget,