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=-13.1 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 52733C55178 for ; Mon, 26 Oct 2020 23:50:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 27F5A21707 for ; Mon, 26 Oct 2020 23:50:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603756215; bh=fKL3J8CPBrYLpzUa1ey64r5goiIaDA6PJaNOwE4RVXI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=BxzLg1REaL+72uSOkYtAaeTgno3SFbKQcHz+sT02onsl843iGIrwih9TWRCnHQkdw 9b+h9oVXtjDrgECHltk8tDYGdiMUDOWdfXfuMRhIklqgFqCCI7C8It98zwE2+oZRCK L7JuPdqT6mp+6JTVzZT96N0aJc1azPPJmvpp51qI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2409054AbgJZXuN (ORCPT ); Mon, 26 Oct 2020 19:50:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:49198 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409041AbgJZXuJ (ORCPT ); Mon, 26 Oct 2020 19:50:09 -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 034AE20874; Mon, 26 Oct 2020 23:50:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603756209; bh=fKL3J8CPBrYLpzUa1ey64r5goiIaDA6PJaNOwE4RVXI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bdoCtbgzgEwsvQNMaxpT3653tDxli6JnZpGZJ5RMeN3LDEbMvjrRQd8S+pGiNjWAM WqHs4d43euKtdh8B3DDIMSe9+EAlee/nYTeN82PuCfbaFw7GmN5LKzriny7XKK8ggr ybBjVIZJmDZQn/GwEIactwWboBHH/9LphO/WOeLc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Madhuparna Bhowmik , Ulf Hansson , Sasha Levin , linux-mmc@vger.kernel.org Subject: [PATCH AUTOSEL 5.9 051/147] mmc: via-sdmmc: Fix data race bug Date: Mon, 26 Oct 2020 19:47:29 -0400 Message-Id: <20201026234905.1022767-51-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201026234905.1022767-1-sashal@kernel.org> References: <20201026234905.1022767-1-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: stable@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); -- 2.25.1