From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 541C5C282CE for ; Mon, 11 Feb 2019 15:53:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 258AB21855 for ; Mon, 11 Feb 2019 15:53:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549900387; bh=oVsxzA2Nv1Tteqi/LWuSaHWh7lcGiUGHNHGInbkNUds=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KWBfgvXlBe9vQPk5bIM6WZ/BiW313aoDQDeIMxyKZK4pIOuGQzmb4hM3kevi3+dDg udjz8NMlVSyFcaXIbwbyoESim9sjF4bJaWh4o8iQqY+AnkOh6qbD86p+/ich1ePU7m e2tDenYqJZSY7u/F3piqU7yiPT/lIQOzxgg+FpC8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731313AbfBKOgp (ORCPT ); Mon, 11 Feb 2019 09:36:45 -0500 Received: from mail.kernel.org ([198.145.29.99]:45906 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731302AbfBKOgm (ORCPT ); Mon, 11 Feb 2019 09:36:42 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CF49C20700; Mon, 11 Feb 2019 14:36:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895802; bh=oVsxzA2Nv1Tteqi/LWuSaHWh7lcGiUGHNHGInbkNUds=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c+PoIS2KrS5BE8He90iJpQMYtXieLOOfjQeDJNol5AHfTGlDndU/j8HViGiKllEOr 5Huwd7DUOmaql/LfN7WRLKT2sTV4IFqk0Ktc6yvBubT9Ulke5sCqzKKMouHUE8/ySu ymQeS8d1ovnTitkJsPWLBakImJVb/fIpv40ZF+rQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Leonid Iziumtsev , Vinod Koul Subject: [PATCH 4.20 327/352] dmaengine: imx-dma: fix wrong callback invoke Date: Mon, 11 Feb 2019 15:19:14 +0100 Message-Id: <20190211141907.651753990@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141846.543045703@linuxfoundation.org> References: <20190211141846.543045703@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Leonid Iziumtsev commit 341198eda723c8c1cddbb006a89ad9e362502ea2 upstream. Once the "ld_queue" list is not empty, next descriptor will migrate into "ld_active" list. The "desc" variable will be overwritten during that transition. And later the dmaengine_desc_get_callback_invoke() will use it as an argument. As result we invoke wrong callback. That behaviour was in place since: commit fcaaba6c7136 ("dmaengine: imx-dma: fix callback path in tasklet"). But after commit 4cd13c21b207 ("softirq: Let ksoftirqd do its job") things got worse, since possible delay between tasklet_schedule() from DMA irq handler and actual tasklet function execution got bigger. And that gave more time for new DMA request to be submitted and to be put into "ld_queue" list. It has been noticed that DMA issue is causing problems for "mxc-mmc" driver. While stressing the system with heavy network traffic and writing/reading to/from sd card simultaneously the timeout may happen: 10013000.sdhci: mxcmci_watchdog: read time out (status = 0x30004900) That often lead to file system corruption. Signed-off-by: Leonid Iziumtsev Signed-off-by: Vinod Koul Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/dma/imx-dma.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -618,7 +618,7 @@ static void imxdma_tasklet(unsigned long { struct imxdma_channel *imxdmac = (void *)data; struct imxdma_engine *imxdma = imxdmac->imxdma; - struct imxdma_desc *desc; + struct imxdma_desc *desc, *next_desc; unsigned long flags; spin_lock_irqsave(&imxdma->lock, flags); @@ -648,10 +648,10 @@ static void imxdma_tasklet(unsigned long list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free); if (!list_empty(&imxdmac->ld_queue)) { - desc = list_first_entry(&imxdmac->ld_queue, struct imxdma_desc, - node); + next_desc = list_first_entry(&imxdmac->ld_queue, + struct imxdma_desc, node); list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active); - if (imxdma_xfer_desc(desc) < 0) + if (imxdma_xfer_desc(next_desc) < 0) dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n", __func__, imxdmac->channel); }