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=-4.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 1BDD3C433F5 for ; Sat, 4 Sep 2021 16:42:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E169160F51 for ; Sat, 4 Sep 2021 16:42:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236807AbhIDQnW (ORCPT ); Sat, 4 Sep 2021 12:43:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49504 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236679AbhIDQnV (ORCPT ); Sat, 4 Sep 2021 12:43:21 -0400 Received: from mail-wm1-x329.google.com (mail-wm1-x329.google.com [IPv6:2a00:1450:4864:20::329]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EED88C061575 for ; Sat, 4 Sep 2021 09:42:19 -0700 (PDT) Received: by mail-wm1-x329.google.com with SMTP id l7-20020a1c2507000000b002e6be5d86b3so1676190wml.3 for ; Sat, 04 Sep 2021 09:42:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=to:cc:from:subject:message-id:date:user-agent:mime-version :content-language:content-transfer-encoding; bh=dqN1F2p/WXZ9l/TtPTY5XeR8JVq9Pp6QHGdHpy1HE3I=; b=f1zivP7BdQJqsJt3aH4+5qamksQVyOu3egGItxzz46L6hSlXjebgdDGf7z90zDm0h4 J65DZ50yz7AyiuB9F1pKhgFaC66Sh6L0RT2iyoV4D03uiuAJmAz/SCddx4MREVZLxT/8 ywNjgpd3Uk3n46Hul0IeZGhk8jcyguRWpVdtmmMTaCn4Rglvg6jug6CLp0UbdnxflS0S X9bRSYYu5qfWOUiPIrPGsDfFQ7v3Mai2onC02KgCLLzycNcPmpzzMo9lx5xRIy3YfFgo RbBhopWwI8qamJkg9dNiqttg5SUzsPCGfgkRaAYxn8eRpbJ5gKQYICGySHu5SVEbEvfe +9AQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:from:subject:message-id:date:user-agent :mime-version:content-language:content-transfer-encoding; bh=dqN1F2p/WXZ9l/TtPTY5XeR8JVq9Pp6QHGdHpy1HE3I=; b=b6X0cAb1CgYwHdnkBICWuwfYGSwTZQEjYJEHNdFAsDBLtrDdRLM+/3A6O/hIgs1X+X qfoBi1nd6cD2EOk4cWVM1crB7blMxW+grnNe4auIoGejXO3X2Xc5/iPo8L7fJJ2sQzYG 92hqB7hRHyhFN87ombNJ5MCJg1thEUFew7RXT+36Rr1mR4hFJlNv1U2BfSryRC4gLIkN BIDmKem4I0QCirWzzOVNYgeckJwVw5WQ1pNFU5CauVCZXs0mTxAxt7bUZen+kYPX8zD7 Oa25+5itxD3vl1N7XqyCT2WGA9zAL7qh0Sz5MfIrUzP2Xp3M8YKCFmyc71tBCIeo2jsh NnzA== X-Gm-Message-State: AOAM532rE/32rlwsNSdQ3VLaHIRxAHhKU5oetDO1DuCEUx4/3uXgjUk+ RqN6EJqDu7PXCtYNIRuSFB4= X-Google-Smtp-Source: ABdhPJy6IHmdnKa8y7tQnGaqR9aFUnn/3xllyUuEYxqMVT32vArhdxrd26LCBENjpStmNLOMd55QlQ== X-Received: by 2002:a7b:c855:: with SMTP id c21mr3920554wml.0.1630773737370; Sat, 04 Sep 2021 09:42:17 -0700 (PDT) Received: from ?IPv6:2003:ea:8f08:4500:dda1:751:1fe4:17b9? (p200300ea8f084500dda107511fe417b9.dip0.t-ipconnect.de. [2003:ea:8f08:4500:dda1:751:1fe4:17b9]) by smtp.googlemail.com with ESMTPSA id r20sm2713786wrr.47.2021.09.04.09.42.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 04 Sep 2021 09:42:17 -0700 (PDT) To: Robert Moore , Erik Kaneda , "Rafael J. Wysocki" Cc: linux-acpi@vger.kernel.org, Jean Delvare From: Heiner Kallweit Subject: Question about acpi_remove_address_space_handler() behavior if handler is running Message-ID: <57a2a9fa-e296-85dc-75f8-94ccd0527204@gmail.com> Date: Sat, 4 Sep 2021 18:42:10 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org i801 i2c driver installs an own ACPI io handler. When discussing some driver improvements one open question is about behavior of acpi_remove_address_space_handler() if the handler is currently running. Will the function wait until handler is finished? In other words, the actual question is: Are we guaranteed that after the call to acpi_remove_address_space_handler() the handler can't be running?