From patchwork Mon May 18 17:36:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 225807 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, 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 C6313C433E1 for ; Mon, 18 May 2020 17:53:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A8F5520872 for ; Mon, 18 May 2020 17:53:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589824389; bh=wafRwZl9fucQ6Kdo8iS7pAL+wKFsNGDbbPPINuz48ZM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=reoobCoqbbZ0HPs86atcPC2RumxhpVrXD+M+EHrrnw5cQqUf/P+xGhEbEFQH29GPQ L/6OycwuPaXuZ6zUXtfzuXToNjuXy37mjDSqlIclrWOVGEntujVcZfwNUwO2F2LsHy j+5P/+X6bIGawy3g8clUvGBROwya3GzA78RgojCc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731083AbgERRxE (ORCPT ); Mon, 18 May 2020 13:53:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:56804 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731081AbgERRxD (ORCPT ); Mon, 18 May 2020 13:53:03 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 EB91420674; Mon, 18 May 2020 17:53:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589824383; bh=wafRwZl9fucQ6Kdo8iS7pAL+wKFsNGDbbPPINuz48ZM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=da8Fe5lHHQJaDKXPJwQbOSHBP8iBsKEf6jbXrfLhFr6yi2f5Ifh/C7GlaiFNhD26J zKrvPVhd1VUr56BDjCuvB1vIkQdtqexV8xNrdGKSuT+wTA70vplMhMZVW385hPZvCq Z5Cz6z/VZKofXsv8aRFt7yJ+uHsFzII0CbLmDoeM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Madhuparna Bhowmik , Vinod Koul , Sasha Levin Subject: [PATCH 4.19 23/80] dmaengine: pch_dma.c: Avoid data race between probe and irq handler Date: Mon, 18 May 2020 19:36:41 +0200 Message-Id: <20200518173455.035907064@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200518173450.097837707@linuxfoundation.org> References: <20200518173450.097837707@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Madhuparna Bhowmik [ Upstream commit 2e45676a4d33af47259fa186ea039122ce263ba9 ] pd->dma.dev is read in irq handler pd_irq(). However, it is set to pdev->dev after request_irq(). Therefore, set pd->dma.dev to pdev->dev before request_irq() to avoid data race between pch_dma_probe() and pd_irq(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Madhuparna Bhowmik Link: https://lore.kernel.org/r/20200416062335.29223-1-madhuparnabhowmik10@gmail.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/pch_dma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c index afd8f27bda969..6e91584c36770 100644 --- a/drivers/dma/pch_dma.c +++ b/drivers/dma/pch_dma.c @@ -873,6 +873,7 @@ static int pch_dma_probe(struct pci_dev *pdev, } pci_set_master(pdev); + pd->dma.dev = &pdev->dev; err = request_irq(pdev->irq, pd_irq, IRQF_SHARED, DRV_NAME, pd); if (err) { @@ -888,7 +889,6 @@ static int pch_dma_probe(struct pci_dev *pdev, goto err_free_irq; } - pd->dma.dev = &pdev->dev; INIT_LIST_HEAD(&pd->dma.channels);