[PATCH v2 1/4] usb: dwc3: gadget: return errors from __dwc3_gadget_start_isoc()

[Felipe Balbi]

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.ba...@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 64481da433ae..18c63137348d 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1266,17 +1266,17 @@ 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)
@@ -1317,8 +1317,7 @@ 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);
                        }
                }
        }
@@ -2381,7 +2380,7 @@ 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,
-- 
2.19.1