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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 43399C433FE for ; Mon, 14 Feb 2022 09:33:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243585AbiBNJda (ORCPT ); Mon, 14 Feb 2022 04:33:30 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:42400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243867AbiBNJdN (ORCPT ); Mon, 14 Feb 2022 04:33:13 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3591B65785; Mon, 14 Feb 2022 01:31:40 -0800 (PST) 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 dfw.source.kernel.org (Postfix) with ESMTPS id B71E460DFD; Mon, 14 Feb 2022 09:31:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8DB93C340E9; Mon, 14 Feb 2022 09:31:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644831099; bh=vKR3XLW8cjvpm8Z/9x3036EkCMG759mpw8h0+7mcmx4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r5EjL4brRV/zi0JmcLekfEke2QQ+RWWwnW0WwU4+cboEc2AlHbdXZ68wadTnt1acV NDRudmu22TxA8d8u0WHaZfqzPF5vpWWIcegVsN2HrRwQ/Yg30XnsApI8dUglgKRqDW 1lUN0Ytp+CbM8Xbfp+64wmfIBb519RIyn8WICeU8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Armin Wolf , =?UTF-8?q?Pali=20Roh=C3=A1r?= , Guenter Roeck Subject: [PATCH 4.14 43/44] hwmon: (dell-smm) Speed up setting of fan speed Date: Mon, 14 Feb 2022 10:26:06 +0100 Message-Id: <20220214092449.293304202@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220214092447.897544753@linuxfoundation.org> References: <20220214092447.897544753@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: stable@vger.kernel.org From: Armin Wolf commit c0d79987a0d82671bff374c07f2201f9bdf4aaa2 upstream. When setting the fan speed, i8k_set_fan() calls i8k_get_fan_status(), causing an unnecessary SMM call since from the two users of this function, only i8k_ioctl_unlocked() needs to know the new fan status while dell_smm_write() ignores the new fan status. Since SMM calls can be very slow while also making error reporting difficult for dell_smm_write(), remove the function call from i8k_set_fan() and call it separately in i8k_ioctl_unlocked(). Tested on a Dell Inspiron 3505. Signed-off-by: Armin Wolf Reviewed-by: Pali Rohár Link: https://lore.kernel.org/r/20211021190531.17379-6-W_Armin@gmx.de Signed-off-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/hwmon/dell-smm-hwmon.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/drivers/hwmon/dell-smm-hwmon.c +++ b/drivers/hwmon/dell-smm-hwmon.c @@ -294,7 +294,7 @@ static int i8k_get_fan_nominal_speed(int } /* - * Set the fan speed (off, low, high). Returns the new fan status. + * Set the fan speed (off, low, high, ...). */ static int i8k_set_fan(int fan, int speed) { @@ -303,7 +303,7 @@ static int i8k_set_fan(int fan, int spee speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed); regs.ebx = (fan & 0xff) | (speed << 8); - return i8k_smm(®s) ? : i8k_get_fan_status(fan); + return i8k_smm(®s); } static int i8k_get_temp_type(int sensor) @@ -417,7 +417,7 @@ static int i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg) { int val = 0; - int speed; + int speed, err; unsigned char buff[16]; int __user *argp = (int __user *)arg; @@ -478,7 +478,11 @@ i8k_ioctl_unlocked(struct file *fp, unsi if (copy_from_user(&speed, argp + 1, sizeof(int))) return -EFAULT; - val = i8k_set_fan(val, speed); + err = i8k_set_fan(val, speed); + if (err < 0) + return err; + + val = i8k_get_fan_status(val); break; default: