Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752261AbdGEJvT (ORCPT ); Wed, 5 Jul 2017 05:51:19 -0400 Received: from mail-wr0-f195.google.com ([209.85.128.195]:33866 "EHLO mail-wr0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750841AbdGEJvR (ORCPT ); Wed, 5 Jul 2017 05:51:17 -0400 Date: Wed, 5 Jul 2017 11:51:13 +0200 From: Pali =?utf-8?B?Um9ow6Fy?= To: "Lee, Chun-Yi" , Corentin Chary , acpi4asus-user@lists.sourceforge.net, Dave Airlie , Oleksij Rempel , =?utf-8?B?Sm/Do28=?= Paulo Rechi Vita Cc: Darren Hart , Andy Shevchenko , Andy Lutomirski , platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] RFC: platform/x86: wmi: Fix check for method instance number Message-ID: <20170705095113.GI2102@pali> References: <1495886134-8276-1-git-send-email-pali.rohar@gmail.com> <20170613184228.GC22450@fury> <20170614154654.GA22981@pali> <201706171847.54407@pali> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <201706171847.54407@pali> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2095 Lines: 60 On Saturday 17 June 2017 18:47:54 Pali Rohár wrote: > > So problematic drivers which use instance=1 without any comments are: > > > > acer-wmi > > asus-wmi > > mxm-wmi > > Adding authors & maintainers of those drivers in loop. Hi! Dell drivers and acer-wmi are fixed now. So only asus-wmi and mxm-wmi needs to be investigated. Adding more people who developed those drivers recently in loop. Can you check if instance number is used correctly or not? > WMI instance number is indexed from zero and therefore first instance > number is 0, not 1. Can you check if for drivers and wmi functions > (specified below) is really correct to use WMI instance number one? > > In case in _WDG is specified for particular GUID that instance_count is > 1, it means the only allowed instance number is 0 (first and the only > one). > > In some cases, when there is only one instance for WMI method, ACPI WMI > bytecode does not check instance number, so any passed value is > accepted by ACPI. But in current patch I'm trying to fix check for > valid instance number based on instance_count information from _WDG. > > So I need to know if nothing would be broken. And in case those driver > issue invalid/incorrect instance number, they needs to be fixed. > > Can you look at it? Simple look into _WDG dump should be enough... just > check if instance number called from wmi driver is less then > instance_count from _WDG. > > On Wednesday 14 June 2017 17:46:54 Pali Rohár wrote: > > Function wmi_query_block: > > > > acer-wmi.c: > > instance=1 /* no comment why, guid=95764E09-FB56-4E83-B31A-37761F60994A */ > > > > > Function wmi_evaluate_method: > > > > acer-wmi.c: > > instance=1 /* no comment why, guid=67C3371D-95A3-4C37-BB61-DD47B491DAAB */ > > instance=1 /* no comment why, guid=6AF4F258-B401-42FD-BE91-3D4AC2D7C0D3 */ > > > > asus-wmi.c: > > instance=1 /* no comment why, guid=97845ED0-4E6D-11DE-8A39-0800200C9A66 */ > > > > mxm-wmi.c: > > instance=1 /* no comment why, guid=F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0 */ > -- Pali Rohár pali.rohar@gmail.com