[1/4] usb: dwc3: gadget: return errors from __dwc3_gadget_start_isoc()

[Felipe Balbi <felipe.balbi@linux.intel.com>]

Sometimes, errors happen when kicking transfers from
__dwc3_gadget_start_isoc(). In those cases, we need to pass along the
error so gadget driver can make informed decisions.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---
 drivers/usb/dwc3/gadget.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 69bf137aab37..f61a4250c883 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1255,17 +1255,17 @@ static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
 	return DWC3_DSTS_SOFFN(reg);
 }
 
-static void __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
+static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
 {
 	if (list_empty(&dep->pending_list)) {
 		dev_info(dep->dwc->dev, "%s: ran out of requests\n",
 				dep->name);
 		dep->flags |= DWC3_EP_PENDING_REQUEST;
-		return;
+		return -EAGAIN;
 	}
 
 	dep->frame_number = DWC3_ALIGN_FRAME(dep);
-	__dwc3_gadget_kick_transfer(dep);
+	return __dwc3_gadget_kick_transfer(dep);
 }
 
 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
@@ -1306,8 +1306,7 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 
 		if ((dep->flags & DWC3_EP_PENDING_REQUEST)) {
 			if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) {
-				__dwc3_gadget_start_isoc(dep);
-				return 0;
+				return __dwc3_gadget_start_isoc(dep);
 			}
 		}
 	}
@@ -2427,7 +2426,7 @@ static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
 		const struct dwc3_event_depevt *event)
 {
 	dwc3_gadget_endpoint_frame_from_event(dep, event);
-	__dwc3_gadget_start_isoc(dep);
+	(void) __dwc3_gadget_start_isoc(dep);
 }
 
 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,