usb: dwc3: gadget: simplify __dwc3_gadget_ep_queue()

There is more possibility for sharing code if we just realise that now
__dwc3_gadget_kic_transfer() knows to break out early if there are no
TRBs left.

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 a943f6e..850fda0 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1290,7 +1290,6 @@ static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 {
        struct dwc3             *dwc = dep->dwc;
-       int                     ret = 0;
 
        if (!dep->endpoint.desc) {
                dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
@@ -1337,24 +1336,14 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
                }
 
                if ((dep->flags & DWC3_EP_BUSY) &&
-                   !(dep->flags & DWC3_EP_MISSED_ISOC)) {
-                       WARN_ON_ONCE(!dep->resource_index);
-                       ret = __dwc3_gadget_kick_transfer(dep,
-                                                         dep->resource_index);
-               }
-
-               goto out;
-       }
+                   !(dep->flags & DWC3_EP_MISSED_ISOC))
+                       goto out;
 
-       if (!dwc3_calc_trbs_left(dep))
                return 0;
+       }
 
-       ret = __dwc3_gadget_kick_transfer(dep, 0);
 out:
-       if (ret == -EBUSY)
-               ret = 0;
-
-       return ret;
+       return __dwc3_gadget_kick_transfer(dep, 0);
 }
 
 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,