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From:   Zeng Tao <prime.zeng@hisilicon.com>
To:     <hminas@synopsys.com>
CC:     <prime.zeng@hisilicon.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH] usb: dwc2: gadget: fix packet drop issue in dwc2_gadget_handle_nak
Date:   Tue, 12 Jun 2018 22:49:06 +0800
Message-ID: <1528814947-27098-1-git-send-email-prime.zeng@hisilicon.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

In ISOC transfer, when the NAK interrupt happens, we shouldn't complete
a usb request, the current flow will complete one usb request with no
hardware transfer, this will lead to a packet drop on the usb bus.

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

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index f0d9ccf..fbe65f6 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -2817,9 +2817,6 @@ static void dwc2_gadget_handle_nak(struct dwc2_hsotg_ep *hs_ep)
 
 		tmp = dwc2_hsotg_read_frameno(hsotg);
 		if (using_desc_dma(hsotg)) {
-			dwc2_hsotg_complete_request(hsotg, hs_ep,
-						    get_ep_head(hs_ep), 0);
-
 			hs_ep->target_frame = tmp;
 			dwc2_gadget_incr_frame_num(hs_ep);
 			dwc2_gadget_start_isoc_ddma(hs_ep);
-- 
2.7.4