From: Peter Chen <peter.chen@freescale.com>
Date: Tue, 28 Jul 2015 02:08:32 +0000 (+0800)
Subject: usb: chipidea: udc: zero-length packet is only needed for TX
X-Git-Tag: v4.3-rc1~156^2~34^2~7
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=a4da4f12b4a7e7072753ebae9b2ccd72b89c3392;p=linux.git

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 27cbd1c2f47f..aca7a97ee5ff 100644
--- 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);