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: 12695310 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BBE3BC433F5 for ; Wed, 8 Dec 2021 10:08:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=1PhbYpjKADuWPv0Ud5K2gy+CIXihqrikIxQeWwiSiXo=; b=ohNDrfF1wkWdTe 1P3xVW4hw8XpSBPBg+kOGW07OH0toA8ZchiiTCrLo8SrcHs43OcmiIws7w7d1HmfA41ilN2435a7K 20ukM7+GsVdlF0N9TzTBIaTeQYB8+7IEOPIEdd731C6I8Wp5ZLe4VEBu4LU2zCbdXvsit/c6cx+X2 oTbndA/h2a5cDHWIBNsmKGVEu+FY0eGIG0zIj95XEtDrA3NPXvx6G9jeRnx355m2fCvdXohbWXnRo RkALZwkxbyHDt7yGpSpxRihiMNg7SxkWqaInHzujVKruKeX2a8zHvIQfE5kuUHhb7UZ6S5PoavcvO sKc9k+HRPfN2QzBnKPvQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mutqW-00C2ML-VT; Wed, 08 Dec 2021 10:06:45 +0000 Received: from twspam01.aspeedtech.com ([211.20.114.71]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mutqS-00C2KK-3p for linux-arm-kernel@lists.infradead.org; Wed, 08 Dec 2021 10:06:42 +0000 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211208_020640_464487_65950181 X-CRM114-Status: UNSURE ( 8.88 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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;