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 CBCD3C433E1 for ; Thu, 20 Aug 2020 13:17:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A0C5022CB3 for ; Thu, 20 Aug 2020 13:17:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597929464; bh=v07Xbj/HWPbOQkiZOboDC1XwxejTbPaUZpj8iwaDbXk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=h87Gx+/+mYavZaIQdk5MRsRNKcw/Lrkk6lp9vayZK9CMfeB2QkmMUxM3lLoxx6iL9 vQfu5uRD/fnckRskLdZI5hikRFUdare6g71iOdFaWGM1KaB6O9BM2NEaK283RCfOl+ CTm1WJWwfSYb80BvSzMwy/0S7OFFc2+jjJEHuupc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728358AbgHTJep (ORCPT ); Thu, 20 Aug 2020 05:34:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:43512 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727034AbgHTJbc (ORCPT ); Thu, 20 Aug 2020 05:31:32 -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 DE22A22B49; Thu, 20 Aug 2020 09:31:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597915892; bh=v07Xbj/HWPbOQkiZOboDC1XwxejTbPaUZpj8iwaDbXk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P2vTAywdSM+SObblT6u8PDDFO/sVIYOEGSZ2AUeLrToXZjmd3T52yfmNptKt+wNNL uPBTdLmQWCw5Cuk5ChfQg20hxitb/BNb8hGPYlx1Am9t0hGgnYRkgTLr7VTd2HbH61 e+7v9vuiswdV7uB4KHD2HoezHnuMPWb6Y2fIEmvo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wolfram Sang , =?UTF-8?q?Niklas=20S=C3=B6derlund?= , Wolfram Sang , Sasha Levin Subject: [PATCH 5.8 172/232] i2c: rcar: avoid race when unregistering slave Date: Thu, 20 Aug 2020 11:20:23 +0200 Message-Id: <20200820091621.150029215@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091612.692383444@linuxfoundation.org> References: <20200820091612.692383444@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wolfram Sang [ Upstream commit c7c9e914f9a0478fba4dc6f227cfd69cf84a4063 ] Due to the lockless design of the driver, it is theoretically possible to access a NULL pointer, if a slave interrupt was running while we were unregistering the slave. To make this rock solid, disable the interrupt for a short time while we are clearing the interrupt_enable register. This patch is purely based on code inspection. The OOPS is super-hard to trigger because clearing SAR (the address) makes interrupts even more unlikely to happen as well. While here, reinit SCR to SDBS because this bit should always be set according to documentation. There is no effect, though, because the interface is disabled. Fixes: 7b814d852af6 ("i2c: rcar: avoid race when unregistering slave client") Signed-off-by: Wolfram Sang Reviewed-by: Niklas Söderlund Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-rcar.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 76c615be5acae..9e883474db8ce 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -866,12 +866,14 @@ static int rcar_unreg_slave(struct i2c_client *slave) WARN_ON(!priv->slave); - /* disable irqs and ensure none is running before clearing ptr */ + /* ensure no irq is running before clearing ptr */ + disable_irq(priv->irq); rcar_i2c_write(priv, ICSIER, 0); - rcar_i2c_write(priv, ICSCR, 0); + rcar_i2c_write(priv, ICSSR, 0); + enable_irq(priv->irq); + rcar_i2c_write(priv, ICSCR, SDBS); rcar_i2c_write(priv, ICSAR, 0); /* Gen2: must be 0 if not using slave */ - synchronize_irq(priv->irq); priv->slave = NULL; pm_runtime_put(rcar_i2c_priv_to_dev(priv)); -- 2.25.1