usb: chipidea: udc: zero-length packet is only needed for TX

The zero-length packet is the sendor tells the receiver that there
is no more data, so it is only needed at the TX side.

Signed-off-by: Peter Chen <peter.chen@freescale.com>

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 27cbd1c..aca7a97 100644 (file)
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -445,7 +445,7 @@ static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
                rest -= count;
        }
 
-       if (hwreq->req.zero && hwreq->req.length
+       if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
            && (hwreq->req.length % hwep->ep.maxpacket == 0))
                add_td_to_list(hwep, hwreq, 0);