From patchwork Sun Nov 11 20:23:56 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Wahren X-Patchwork-Id: 10677849 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1C10E14BD for ; Sun, 11 Nov 2018 20:25:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0F2732969C for ; Sun, 11 Nov 2018 20:25:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 01CF8296F9; Sun, 11 Nov 2018 20:25:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3F7FA2969C for ; Sun, 11 Nov 2018 20:25:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730770AbeKLGO2 (ORCPT ); Mon, 12 Nov 2018 01:14:28 -0500 Received: from mout.kundenserver.de ([212.227.126.187]:44733 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728613AbeKLGOY (ORCPT ); Mon, 12 Nov 2018 01:14:24 -0500 Received: from localhost.localdomain ([37.4.249.153]) by mrelayeu.kundenserver.de (mreue012 [212.227.15.167]) with ESMTPSA (Nemesis) id 1MvsyF-1fX0UR1Q9v-00ssSz; Sun, 11 Nov 2018 21:24:32 +0100 From: Stefan Wahren To: Eric Anholt , Florian Fainelli , Ulf Hansson Cc: Phil Elwell , Michal Suchanek , linux-rpi-kernel@lists.infradead.org, linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Stefan Wahren Subject: [PATCH V2 4/7] mmc: bcm2835: Avoid possible races on data requests Date: Sun, 11 Nov 2018 21:23:56 +0100 Message-Id: <1541967839-2847-5-git-send-email-stefan.wahren@i2se.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1541967839-2847-1-git-send-email-stefan.wahren@i2se.com> References: <1541967839-2847-1-git-send-email-stefan.wahren@i2se.com> X-Provags-ID: V03:K1:ZLc6V0DmkpQIP44hYwa3HseRh7CvRoA9oKdzKs8yIsk8165B4Wj xh/v/qDrvpHbc6Mo7+ESlJoA7iV2QBpKIYXkV+l+LxP1hUGn0iO44fmLP2qBvLJtZvx/Ojh 06wOufM/u9ZWw0FVd6z87NbwhQC+r0Hdx+GWumlgWYq9lppFAMYe+6pIqLKFwesssADK3OS 0MJwlz/he/7bB9DxhEcnw== X-UI-Out-Filterresults: notjunk:1;V01:K0:lLFqbCq1JEc=:4dOYlMJrif5X850MHJ4IKv SsggGIkb+7xoay8mJWO2ixu2r0n0ZJp/p5GCqVWB8a8GEJ5AXj04izOlxindxB0yxAXLfOtEY +MADRnLwkXLIyvJ52YOhbudb4v+KVS8LnZmdnl+7dYi8ILPPI8K1YyOA0Atm0Sc1zKCyzyrb+ HXYtIBmpCCeoXAn6iF9KtPShMQN90JkCkhQDCTtvuHKB4+XasgiJQqwLvDbMhUTfAiHKRbT6A Ret67MCTcoBZMJ8Lv5IVe96pGyj6/IftFJwD456d201u/qlGUEcsrQlXoVDZyYQINncWlmCe9 nhfpQF8UozqPck8kat7pUYNcoUck660Ob7tS+eW6IQxtgNKjjkiaYgE0VlcnBWXS46anJouuq rFWawTXHFsLU6SVpIIVC5wCmDIOpgnWg2E5Dg6O3JtD4JPpSw9V3hM8L34Ii6DfWsvPAlJ46O kCFiB/zfxUDXTLqed/nM9eufpPmQGlkRVnwoBNh18c7patPv1MzAU94KuN0ciq4QgoPk400rI 5AOu/Eb9ck9CqDcZnI9x3PGjBoRgf0O/cvmqP67kgt1u17W9OEGaqHaEkXh+xLTDICpauVWMp kOXBFyQ2SWK4jxt/C1uNgcghWG4r8UDxx9LFHZA0Ut2oGO2bW8qkpXlRBI11lvMuK3P+jSSXu 8ZdD0IA/lvl6PXMOo1Zs7F+mho7h8yoB6XvVBOO8Mh8VonIPfeFZAQOrF/WP5SI3te/r5jk8v wI7Eoz+v7SK4TMhwvTrIv+Q6zGYykDWUFqpehDe/ZhMpdl/XnD0H+Z9jGWgv6Wyi6Rmwc2JEJ 6Xq84VFzxbb0yps5VJcK6at8C/JGA== Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP There are two accesses on the data requests which are not protected by the mutex. So fix this accordingly. Signed-off-by: Stefan Wahren --- drivers/mmc/host/bcm2835.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c index 45724ef..1c60798 100644 --- a/drivers/mmc/host/bcm2835.c +++ b/drivers/mmc/host/bcm2835.c @@ -1064,10 +1064,12 @@ static void bcm2835_dma_complete_work(struct work_struct *work) { struct bcm2835_host *host = container_of(work, struct bcm2835_host, dma_work); - struct mmc_data *data = host->data; + struct mmc_data *data; mutex_lock(&host->mutex); + data = host->data; + if (host->dma_chan) { dma_unmap_sg(host->dma_chan->device->dev, data->sg, data->sg_len, @@ -1192,9 +1194,6 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq) return; } - if (host->use_dma && mrq->data && (mrq->data->blocks > PIO_THRESHOLD)) - bcm2835_prepare_dma(host, mrq->data); - mutex_lock(&host->mutex); WARN_ON(host->mrq); @@ -1218,6 +1217,9 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq) return; } + if (host->use_dma && mrq->data && (mrq->data->blocks > PIO_THRESHOLD)) + bcm2835_prepare_dma(host, mrq->data); + host->use_sbc = !!mrq->sbc && host->mrq->data && (host->mrq->data->flags & MMC_DATA_READ); if (host->use_sbc) {