From patchwork Mon May 16 19:36:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 573422 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CFCB0C433FE for ; Mon, 16 May 2022 19:39:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345633AbiEPTjh (ORCPT ); Mon, 16 May 2022 15:39:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345579AbiEPTjZ (ORCPT ); Mon, 16 May 2022 15:39:25 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9872F3F31C; Mon, 16 May 2022 12:38:53 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 1EEB5B81609; Mon, 16 May 2022 19:38:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F3C6C34115; Mon, 16 May 2022 19:38:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652729930; bh=X65NaARiVhWE3hBp8wrNL7JCiDF9IsgifmPUCvkdaR8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n0FNJkfiCqtJPkQivDwDr7jDmnx2Q3gPk/qqFSVE/MquC8V8sN0QCiH3GHjF509Lr D7bEPwQ6VkOsiOZPP7vTpRlNtaxfAe4z7lOyKwDMjHdwoSIFHIw7FfWhJ/REuh2ZSE nvzR8zGDVosOPZPhH4L3BaXNBMkFyWAb5rA0aGFQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Ji-Ze Hong (Peter Hong)" , Guenter Roeck , Sasha Levin Subject: [PATCH 4.9 09/19] hwmon: (f71882fg) Fix negative temperature Date: Mon, 16 May 2022 21:36:22 +0200 Message-Id: <20220516193613.777361444@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193613.497233635@linuxfoundation.org> References: <20220516193613.497233635@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ji-Ze Hong (Peter Hong) [ Upstream commit 4aaaaf0f279836f06d3b9d0ffeec7a1e1a04ceef ] All temperature of Fintek superio hwmonitor that using 1-byte reg will use 2's complement. In show_temp() temp = data->temp[nr] * 1000; When data->temp[nr] read as 255, it indicate -1C, but this code will report 255C to userspace. It'll be ok when change to: temp = ((s8)data->temp[nr]) * 1000; Signed-off-by: Ji-Ze Hong (Peter Hong) Link: https://lore.kernel.org/r/20220418090706.6339-1-hpeter+linux_kernel@gmail.com Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/f71882fg.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/f71882fg.c b/drivers/hwmon/f71882fg.c index cb28e4b4fb10..b87ca56fb774 100644 --- a/drivers/hwmon/f71882fg.c +++ b/drivers/hwmon/f71882fg.c @@ -1590,8 +1590,9 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, temp *= 125; if (sign) temp -= 128000; - } else - temp = data->temp[nr] * 1000; + } else { + temp = ((s8)data->temp[nr]) * 1000; + } return sprintf(buf, "%d\n", temp); }