From patchwork Wed Dec 8 10:05:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Neal Liu X-Patchwork-Id: 12663979 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E01AC433FE for ; Wed, 8 Dec 2021 10:06:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229803AbhLHKKW (ORCPT ); Wed, 8 Dec 2021 05:10:22 -0500 Received: from twspam01.aspeedtech.com ([211.20.114.71]:52953 "EHLO twspam01.aspeedtech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229625AbhLHKKV (ORCPT ); Wed, 8 Dec 2021 05:10:21 -0500 Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 1B89eqpO032351; Wed, 8 Dec 2021 17:40:53 +0800 (GMT-8) (envelope-from neal_liu@aspeedtech.com) Received: from localhost.localdomain (192.168.10.10) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 8 Dec 2021 18:05:52 +0800 From: Neal Liu To: Felipe Balbi , Greg Kroah-Hartman , Joel Stanley , Andrew Jeffery , Cai Huoqing , Tao Ren , Julia Lawall , "kernel test robot" , Sasha Levin , , , , , CC: Neal Liu , Subject: [PATCH v3 3/4] usb: aspeed-vhub: fix ep0 OUT ack received wrong length issue Date: Wed, 8 Dec 2021 18:05:44 +0800 Message-ID: <20211208100545.1441397-4-neal_liu@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211208100545.1441397-1-neal_liu@aspeedtech.com> References: <20211208100545.1441397-1-neal_liu@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.10.10] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 1B89eqpO032351 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org If multiple devices in vhub are enumerated simultaneously, ep0 OUT ack might received wrong data length. Using expected data length instead. Acked-by: Benjamin Herrenschmidt Signed-off-by: Neal Liu --- drivers/usb/gadget/udc/aspeed-vhub/ep0.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/gadget/udc/aspeed-vhub/ep0.c b/drivers/usb/gadget/udc/aspeed-vhub/ep0.c index 74ea36c19b1e..b4cf46249fea 100644 --- a/drivers/usb/gadget/udc/aspeed-vhub/ep0.c +++ b/drivers/usb/gadget/udc/aspeed-vhub/ep0.c @@ -251,6 +251,13 @@ static void ast_vhub_ep0_do_receive(struct ast_vhub_ep *ep, struct ast_vhub_req len = remain; rc = -EOVERFLOW; } + + /* Hardware return wrong data len */ + if (len < ep->ep.maxpacket && len != remain) { + EPDBG(ep, "using expected data len instead\n"); + len = remain; + } + if (len && req->req.buf) memcpy(req->req.buf + req->req.actual, ep->buf, len); req->req.actual += len;