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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 4751AC433F5 for ; Mon, 20 Sep 2021 17:24:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2ECFC632D4 for ; Mon, 20 Sep 2021 17:24:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350027AbhITR0C (ORCPT ); Mon, 20 Sep 2021 13:26:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:54874 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346011AbhITRXJ (ORCPT ); Mon, 20 Sep 2021 13:23:09 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8E84B61A83; Mon, 20 Sep 2021 17:01:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632157292; bh=wzVDT37lH9Bt1PqEs6wucnIu2XQ9yKhvKOBrUdOjV+k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nhfKXACqXty+JTq2hMt3rma6wauzMF/QsnRK4OGEwBtE5WHn4FcNVkmo9UOahpc94 OZwBiBrW9HQPTqjEHoVMGkEdA6YYHhlG4FzblziZkP6oCJBu9iJH9TA1uKA1OY3Pug 1FLpBY8xrzCV+b3EpgwiuI438ZVvj6wKlqn5Tx8Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Krzysztof Kozlowski , Hans de Goede , Sebastian Reichel Subject: [PATCH 4.14 109/217] power: supply: max17042: handle fails of reading status register Date: Mon, 20 Sep 2021 18:42:10 +0200 Message-Id: <20210920163928.331366868@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163924.591371269@linuxfoundation.org> References: <20210920163924.591371269@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: Krzysztof Kozlowski commit 54784ffa5b267f57161eb8fbb811499f22a0a0bf upstream. Reading status register can fail in the interrupt handler. In such case, the regmap_read() will not store anything useful under passed 'val' variable and random stack value will be used to determine type of interrupt. Handle the regmap_read() failure to avoid handling interrupt type and triggering changed power supply event based on random stack value. Fixes: 39e7213edc4f ("max17042_battery: Support regmap to access device's registers") Cc: Signed-off-by: Krzysztof Kozlowski Reviewed-by: Hans de Goede Signed-off-by: Sebastian Reichel Signed-off-by: Greg Kroah-Hartman --- drivers/power/supply/max17042_battery.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/power/supply/max17042_battery.c +++ b/drivers/power/supply/max17042_battery.c @@ -833,8 +833,12 @@ static irqreturn_t max17042_thread_handl { struct max17042_chip *chip = dev; u32 val; + int ret; + + ret = regmap_read(chip->regmap, MAX17042_STATUS, &val); + if (ret) + return IRQ_HANDLED; - regmap_read(chip->regmap, MAX17042_STATUS, &val); if ((val & STATUS_INTR_SOCMIN_BIT) || (val & STATUS_INTR_SOCMAX_BIT)) { dev_info(&chip->client->dev, "SOC threshold INTR\n");