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 4021AC2D0A3 for ; Tue, 3 Nov 2020 22:08:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0730D20665 for ; Tue, 3 Nov 2020 22:08:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604441291; bh=42SDGHT8q9hXpPUPA7/+Q8TsEY2aGukKw1eggi26gfc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1vUevWx8s7y/0ZlH8b9p+EU8gXwcyTxTKwIgC3wByC0oaAGZHjzW99GFsi+f/+y33 EDkqdh767lk//Q9OMVMq4neBEKIkivOQPrNwp9xrjVuJvG9C6AOieqSBhYGxmzxddu PL1rNlXkYDVMUkAd4jMgF6wrTRbE9TU/M8P3ulVs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731460AbgKCWIJ (ORCPT ); Tue, 3 Nov 2020 17:08:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:53066 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730340AbgKCUlS (ORCPT ); Tue, 3 Nov 2020 15:41:18 -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 5EF7C22277; Tue, 3 Nov 2020 20:41:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604436077; bh=42SDGHT8q9hXpPUPA7/+Q8TsEY2aGukKw1eggi26gfc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wHx6bvYTz+1DFYaBxwpofnzKfKyXvma60nyQrcC80AGSGO4yAsmXBTONprT6Z4uIH 0a459+kKpXF1y3vekn8GVB6SzUbqNLoSctEsMi4S6N1usjteLpzrHFOFbJjZdu+QeS RqFV5W2kj+FUSO0yeaLefnjOu9iIe/z0QzAIFIGE= 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 5.9 092/391] mmc: via-sdmmc: Fix data race bug Date: Tue, 3 Nov 2020 21:32:23 +0100 Message-Id: <20201103203353.146114370@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201103203348.153465465@linuxfoundation.org> References: <20201103203348.153465465@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 49dab9f42b6d6..9b755ea0fa03c 100644 --- a/drivers/mmc/host/via-sdmmc.c +++ b/drivers/mmc/host/via-sdmmc.c @@ -1257,11 +1257,14 @@ static void __maybe_unused via_init_sdc_pm(struct via_crdr_mmc_host *host) static int __maybe_unused via_sd_suspend(struct device *dev) { struct via_crdr_mmc_host *host; + unsigned long flags; host = dev_get_drvdata(dev); + spin_lock_irqsave(&host->lock, flags); via_save_pcictrlreg(host); via_save_sdcreg(host); + spin_unlock_irqrestore(&host->lock, flags); device_wakeup_enable(dev); -- 2.27.0