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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 A090AC2D0A3 for ; Mon, 9 Nov 2020 13:45:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D2EF20731 for ; Mon, 9 Nov 2020 13:45:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604929542; bh=Q6bDaJS34z/8dLa28ozlSl9YUGCmH0TY7XAVGCgRy9Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eNfEZfeG3wcGBTnBMdR0wRFumZZghthE1+I+H9CdqOpByuXRNSJYkna9CR1AtAnqm gvhCj5kkxMpozB4qRCn3DpJF1YKBsiOKZfeddoeT7uh205yFhr/0sX56DQdcnXlsZC pfBIYXAk2TwKTzCwkeFKTJRs83gCRaOORJRiD2N4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730091AbgKIM6U (ORCPT ); Mon, 9 Nov 2020 07:58:20 -0500 Received: from mail.kernel.org ([198.145.29.99]:52278 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730058AbgKIM5r (ORCPT ); Mon, 9 Nov 2020 07:57:47 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 C67572076E; Mon, 9 Nov 2020 12:57:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604926666; bh=Q6bDaJS34z/8dLa28ozlSl9YUGCmH0TY7XAVGCgRy9Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T8u2IR/IDHRpoTH06cAxqpfPK4KFZPM16ScgzngrOedEg5JNlkLhEijNXZ79kMABj tqu2mbHxXGmylthtHb1aVNzHkxLc93rcWRgCsQYzjUb3DGUTYcGojbaucd1mI9+l8C lI4ITOEdMCmxbkM1zDH6v+GR25rZ8hpk+03cSTOk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Madhuparna Bhowmik , Ulf Hansson , Sasha Levin Subject: [PATCH 4.4 18/86] mmc: via-sdmmc: Fix data race bug Date: Mon, 9 Nov 2020 13:54:25 +0100 Message-Id: <20201109125021.747711358@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125020.852643676@linuxfoundation.org> References: <20201109125020.852643676@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Madhuparna Bhowmik [ Upstream commit 87d7ad089b318b4f319bf57f1daa64eb6d1d10ad ] via_save_pcictrlreg() should be called with host->lock held as it writes to pm_pcictrl_reg, otherwise there can be a race condition between via_sd_suspend() and via_sdc_card_detect(). The same pattern is used in the function via_reset_pcictrl() as well, where via_save_pcictrlreg() is called with host->lock held. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Madhuparna Bhowmik Link: https://lore.kernel.org/r/20200822061528.7035-1-madhuparnabhowmik10@gmail.com Signed-off-by: Ulf Hansson Signed-off-by: Sasha Levin --- drivers/mmc/host/via-sdmmc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c index 63fac78b3d46a..b455e9cf95afc 100644 --- a/drivers/mmc/host/via-sdmmc.c +++ b/drivers/mmc/host/via-sdmmc.c @@ -1269,11 +1269,14 @@ static void via_init_sdc_pm(struct via_crdr_mmc_host *host) static int via_sd_suspend(struct pci_dev *pcidev, pm_message_t state) { struct via_crdr_mmc_host *host; + unsigned long flags; host = pci_get_drvdata(pcidev); + spin_lock_irqsave(&host->lock, flags); via_save_pcictrlreg(host); via_save_sdcreg(host); + spin_unlock_irqrestore(&host->lock, flags); pci_save_state(pcidev); pci_enable_wake(pcidev, pci_choose_state(pcidev, state), 0); -- 2.27.0