[PATCH] usb: dwc2: gadget: fix missing process for isoc descriptor dma mode

[Zeng Tao]

If it's the first request to queue, and we are using descriptor dma mode
for isoc transfer, we only need to add the request to the queue, and it
will be processed in the future nak interrupt handler.

Signed-off-by: Zeng Tao <prime.zeng@xxxxxxxxxxxxx>
---
 drivers/usb/dwc2/gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index f0d9ccf..48e3a48c 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -1365,6 +1365,9 @@ static int dwc2_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req,
 			return 0;
 		}
 
+		if (using_desc_dma(hs))
+			return 0;
+
 		/* Update current frame number value. */
 		hs->frame_number = dwc2_hsotg_read_frameno(hs);
 		while (dwc2_gadget_target_frame_elapsed(hs_ep)) {
-- 
2.7.4