If the transfer had already started and there's no TRB to update, then
there's no need to go through __dwc3_gadget_kick_transfer(). There is
no problem reissuing UPDATE_TRANSFER command. This change just saves
the driver from doing a few operations. This happens when we run out of
TRB and function driver still queues for more requests.
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index ff924656f690..da1f2ad2ad90 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1347,6 +1347,13 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
starting = !(dep->flags & DWC3_EP_TRANSFER_STARTED);
+ /*
+ * If there's no new TRB prepared and we don't need to restart a
+ * transfer, there's no need to update the transfer.
+ */
+ if (!ret && !starting)
+ return ret;
+
req = next_request(&dep->started_list);
if (!req) {
dep->flags |= DWC3_EP_PENDING_REQUEST;
--
2.28.0
