From patchwork Thu May 20 09:22:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 445299 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5DA56C433ED for ; Thu, 20 May 2021 11:15:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 396C760240 for ; Thu, 20 May 2021 11:15:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240088AbhETLRA (ORCPT ); Thu, 20 May 2021 07:17:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:37860 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240595AbhETLO7 (ORCPT ); Thu, 20 May 2021 07:14:59 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E0C1C6194C; Thu, 20 May 2021 10:08:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621505322; bh=w1zepXwKZCJSEghz91NfTQzyP7m84JxtGMbjg+FLY/U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UZViFlIEdWQ4kMHFpFxxkrAaa0NwmPYQNbFQjPzhxRp7Czy9LR9i4sPY3g2OHIx+T RGuE1y6WNjR7C9FdmooECzoq5JBDDrLv7rW/9VXTeCMni7BG9LxhKkBzoAddr0k8Nv Hk4x7GnDED2jJuQiJIqQJ5HUSULRsxIT/4vEoME0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Fabian Vogt , Sasha Levin Subject: [PATCH 4.4 083/190] fotg210-udc: Fix DMA on EP0 for length > max packet size Date: Thu, 20 May 2021 11:22:27 +0200 Message-Id: <20210520092104.944253767@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092102.149300807@linuxfoundation.org> References: <20210520092102.149300807@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Fabian Vogt [ Upstream commit 755915fc28edfc608fa89a163014acb2f31c1e19 ] For a 75 Byte request, it would send the first 64 separately, then detect that the remaining 11 Byte fit into a single DMA, but due to this bug set the length to the original 75 Bytes. This leads to a DMA failure (which is ignored...) and the request completes without the remaining bytes having been sent. Fixes: b84a8dee23fd ("usb: gadget: add Faraday fotg210_udc driver") Signed-off-by: Fabian Vogt Link: https://lore.kernel.org/r/20210324141115.9384-2-fabian@ritter-vogt.de Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/gadget/udc/fotg210-udc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/fotg210-udc.c b/drivers/usb/gadget/udc/fotg210-udc.c index 76e991557116..7831c556a40b 100644 --- a/drivers/usb/gadget/udc/fotg210-udc.c +++ b/drivers/usb/gadget/udc/fotg210-udc.c @@ -348,7 +348,7 @@ static void fotg210_start_dma(struct fotg210_ep *ep, if (req->req.length - req->req.actual > ep->ep.maxpacket) length = ep->ep.maxpacket; else - length = req->req.length; + length = req->req.length - req->req.actual; } d = dma_map_single(NULL, buffer, length,