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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 4563CC43465 for ; Fri, 18 Sep 2020 03:06:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F00E623119 for ; Fri, 18 Sep 2020 03:06:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600398411; bh=Jb4b+5OTPSm0f+YOgcsf9eXrLB8ukGPqsuUkC1mKNy4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mSJkS5QUUcjei3maESxOMu6/ogBsoajX/apbHxWtCGVbKhT0ITWmXNrvBsKI+XeH6 Gs6fXzBn0OJ9M0pDaJ/2nptpIqofBHaLdzuJoV73UFxZgE6vUiD5UbE73ajvadqJ6r KiwCD7vI06oCdNdU8uq6CwBEi8rymnk+wcR9xLYc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727206AbgIRCEB (ORCPT ); Thu, 17 Sep 2020 22:04:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:50890 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727199AbgIRCEB (ORCPT ); Thu, 17 Sep 2020 22:04:01 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3BFF823718; Fri, 18 Sep 2020 02:03:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600394637; bh=Jb4b+5OTPSm0f+YOgcsf9eXrLB8ukGPqsuUkC1mKNy4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PHHrEa2LuohVBtd0d2c0FRcouWqrjl2DNEljIwXFeaUuX2C99yhvHHA/JMxbYqqPm OsJr0h9bsKOHlpOBDyGM8UlUpyAM1gNbKMnrAhHpIcKAFTyIRZeGdDUK8XTulBVvRy 32NuJS+rQx/+ipDk5QVlVhDyB7ZqHBWkl3qqZ/GQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Amelie Delaunay , Vinod Koul , Sasha Levin , dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 5.4 136/330] dmaengine: stm32-mdma: use vchan_terminate_vdesc() in .terminate_all Date: Thu, 17 Sep 2020 21:57:56 -0400 Message-Id: <20200918020110.2063155-136-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918020110.2063155-1-sashal@kernel.org> References: <20200918020110.2063155-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org From: Amelie Delaunay [ Upstream commit dfc708812a2acfc0ca56f56233b3c3e7b0d4ffe7 ] To avoid race with vchan_complete, use the race free way to terminate running transfer. Move vdesc->node list_del in stm32_mdma_start_transfer instead of in stm32_mdma_xfer_end to avoid another race in vchan_dma_desc_free_list. Signed-off-by: Amelie Delaunay Link: https://lore.kernel.org/r/20200127085334.13163-7-amelie.delaunay@st.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/stm32-mdma.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index 5838311cf9900..ee1cbf3be75d5 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -1127,6 +1127,8 @@ static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan) return; } + list_del(&vdesc->node); + chan->desc = to_stm32_mdma_desc(vdesc); hwdesc = chan->desc->node[0].hwdesc; chan->curr_hwdesc = 0; @@ -1242,8 +1244,10 @@ static int stm32_mdma_terminate_all(struct dma_chan *c) LIST_HEAD(head); spin_lock_irqsave(&chan->vchan.lock, flags); - if (chan->busy) { - stm32_mdma_stop(chan); + if (chan->desc) { + vchan_terminate_vdesc(&chan->desc->vdesc); + if (chan->busy) + stm32_mdma_stop(chan); chan->desc = NULL; } vchan_get_all_descriptors(&chan->vchan, &head); @@ -1331,7 +1335,6 @@ static enum dma_status stm32_mdma_tx_status(struct dma_chan *c, static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan) { - list_del(&chan->desc->vdesc.node); vchan_cookie_complete(&chan->desc->vdesc); chan->desc = NULL; chan->busy = false; -- 2.25.1 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=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 70C92C43465 for ; Fri, 18 Sep 2020 02:08:40 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2D3DA238E6 for ; 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bh=b2kIza1BKV0sOnqLiSOTsKAvcrvYZIOc8gVu++jMXYw=; b=XL9KUzHySrGz+X3k2SgJk9viG zaCE0jL0QiBWPZojqFFPFbAzoVZovN2Ly0sqZ25xyyZ2dVXov1d4qArIihJH0xvkgu3/KoAAR0QSD 69wFvY8BFwUqyd19v+VGfwYQ56ZrE2C8DdH4t04/fm72SgG/LgYWSHdxsDqU6ict4OeSa9BPzNKhl vO7QXYWgUPlXJ87zqvv+tQBsUwB8za1xxsxT+PcjeynzGxEfEStc3uEMfkBpHkkwlw+sO+hRTtqGr SsfaHcChvAMmAH0iYsyyItl+4ObiJy1pWIfTX+Eub0eCRXcIkHOnCesUH6nv1IHJGsg4qoy5oUvK9 wmE33EFHg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kJ5n3-00049F-VZ; Fri, 18 Sep 2020 02:06:22 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kJ5kk-0002to-IY for linux-arm-kernel@lists.infradead.org; Fri, 18 Sep 2020 02:03:59 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3BFF823718; Fri, 18 Sep 2020 02:03:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600394637; bh=Jb4b+5OTPSm0f+YOgcsf9eXrLB8ukGPqsuUkC1mKNy4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PHHrEa2LuohVBtd0d2c0FRcouWqrjl2DNEljIwXFeaUuX2C99yhvHHA/JMxbYqqPm OsJr0h9bsKOHlpOBDyGM8UlUpyAM1gNbKMnrAhHpIcKAFTyIRZeGdDUK8XTulBVvRy 32NuJS+rQx/+ipDk5QVlVhDyB7ZqHBWkl3qqZ/GQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 136/330] dmaengine: stm32-mdma: use vchan_terminate_vdesc() in .terminate_all Date: Thu, 17 Sep 2020 21:57:56 -0400 Message-Id: <20200918020110.2063155-136-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918020110.2063155-1-sashal@kernel.org> References: <20200918020110.2063155-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200917_220358_849179_3CC88627 X-CRM114-Status: GOOD ( 12.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , dmaengine@vger.kernel.org, Amelie Delaunay , Vinod Koul , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Amelie Delaunay [ Upstream commit dfc708812a2acfc0ca56f56233b3c3e7b0d4ffe7 ] To avoid race with vchan_complete, use the race free way to terminate running transfer. Move vdesc->node list_del in stm32_mdma_start_transfer instead of in stm32_mdma_xfer_end to avoid another race in vchan_dma_desc_free_list. Signed-off-by: Amelie Delaunay Link: https://lore.kernel.org/r/20200127085334.13163-7-amelie.delaunay@st.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/stm32-mdma.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index 5838311cf9900..ee1cbf3be75d5 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -1127,6 +1127,8 @@ static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan) return; } + list_del(&vdesc->node); + chan->desc = to_stm32_mdma_desc(vdesc); hwdesc = chan->desc->node[0].hwdesc; chan->curr_hwdesc = 0; @@ -1242,8 +1244,10 @@ static int stm32_mdma_terminate_all(struct dma_chan *c) LIST_HEAD(head); spin_lock_irqsave(&chan->vchan.lock, flags); - if (chan->busy) { - stm32_mdma_stop(chan); + if (chan->desc) { + vchan_terminate_vdesc(&chan->desc->vdesc); + if (chan->busy) + stm32_mdma_stop(chan); chan->desc = NULL; } vchan_get_all_descriptors(&chan->vchan, &head); @@ -1331,7 +1335,6 @@ static enum dma_status stm32_mdma_tx_status(struct dma_chan *c, static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan) { - list_del(&chan->desc->vdesc.node); vchan_cookie_complete(&chan->desc->vdesc); chan->desc = NULL; chan->busy = false; -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel