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=-5.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 59B45C433DF for ; Sun, 24 May 2020 16:43:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 36F2E20826 for ; Sun, 24 May 2020 16:43:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="mR10ZDOw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729177AbgEXQnS (ORCPT ); Sun, 24 May 2020 12:43:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40478 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727899AbgEXQnR (ORCPT ); Sun, 24 May 2020 12:43:17 -0400 Received: from mail-pl1-x641.google.com (mail-pl1-x641.google.com [IPv6:2607:f8b0:4864:20::641]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD386C061A0E; Sun, 24 May 2020 09:43:17 -0700 (PDT) Received: by mail-pl1-x641.google.com with SMTP id x10so6603401plr.4; Sun, 24 May 2020 09:43:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:cc:references:from:autocrypt:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=XAFvLDLVk+fI9vcRffoRabYuSUAZ7foc/2FknM3OJDw=; b=mR10ZDOwUPnZ98RY9JQBF8GGJ9fj9ZF+o+PnQLl86JC992UQjmjsfHjaxxBm2xVksH J0605cJK76GuUU0rZzvvw/kuqztwznKYErPBHLkm/q596PqPYnT9oDRpBWorvRY8HVlD O7MRhKhbDC15n6G4LOiWXDuqY9UeJPgq8SFA3m2dAnYm2mmPQV4tj1d9iTGFlONkvkxL 1TnGGHvr8hyERQeGq/qMtwcf1czl68sQ4dZxCn5s5bTF6iZnsCuORS4rhphwnJC0/jwg PAqiv2ZfH6Rywc2RTSBMonvZo/6XSF81kZwiY7uNQci/j1cQg23X/g6Kcl3ybG2dlKfu lLhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=XAFvLDLVk+fI9vcRffoRabYuSUAZ7foc/2FknM3OJDw=; b=omljf69oggwIuY7ET8D1wVwFUiYN1ZbWeOZ6dtpdw1NMn+inMEOboJU8Tgt8wM85Tw GO+kL12V9nBbKKzIr9ILeIfbK8iFndc+2p1uQDo9CdZE1z+7/djxDUrZ4G6SHJ5/og3c P5IaQQUgQqIHo8npqTBtWixJBkBtaGB7AmxMVIRiFKKTNfx8vtiNJPIuTb42DgFADvWk MyOO5X51OIttOHy3oghxFsHdgFIR89D0lOgjllcdjoexNnuu2mu6wDHjvjmfWCW7RpNr e/O5EuDlrg1bWAdsZ5J6ZX7JwT4D8Gauf4q90EMmazGx0uR0fjNYIazrE1V9itWV2aa8 nDyw== X-Gm-Message-State: AOAM5339kdACVh1yBdeIU9OXlL1WTIcHqFjpcF3/rWpd5VbixJsifuiN qSE0eMpFm7tUQW5Lnb/ywmo= X-Google-Smtp-Source: ABdhPJzwfUfIN57VUlE/mNxC8H8yQuocPp1YPBn3zygMImsSr4pwme3srmJuc3+JomQiYyqWNa8JNg== X-Received: by 2002:a17:902:207:: with SMTP id 7mr23827269plc.331.1590338597356; Sun, 24 May 2020 09:43:17 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id b11sm11200679pjz.54.2020.05.24.09.43.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 24 May 2020 09:43:16 -0700 (PDT) Subject: Re: [PATCH 1/2] software node: implement software_node_unregister() To: Greg Kroah-Hartman , linux-kernel@vger.kernel.org Cc: Naresh Kamboju , kernel test robot , stable , Andy Shevchenko , Brendan Higgins , Dmitry Torokhov , Heikki Krogerus , Petr Mladek , "Rafael J . Wysocki" , Randy Dunlap , Rasmus Villemoes , Sakari Ailus , Sergey Senozhatsky , Steven Rostedt References: <20200524153041.2361-1-gregkh@linuxfoundation.org> From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; keydata= xsFNBE6H1WcBEACu6jIcw5kZ5dGeJ7E7B2uweQR/4FGxH10/H1O1+ApmcQ9i87XdZQiB9cpN RYHA7RCEK2dh6dDccykQk3bC90xXMPg+O3R+C/SkwcnUak1UZaeK/SwQbq/t0tkMzYDRxfJ7 nyFiKxUehbNF3r9qlJgPqONwX5vJy4/GvDHdddSCxV41P/ejsZ8PykxyJs98UWhF54tGRWFl 7i1xvaDB9lN5WTLRKSO7wICuLiSz5WZHXMkyF4d+/O5ll7yz/o/JxK5vO/sduYDIlFTvBZDh gzaEtNf5tQjsjG4io8E0Yq0ViobLkS2RTNZT8ICq/Jmvl0SpbHRvYwa2DhNsK0YjHFQBB0FX IdhdUEzNefcNcYvqigJpdICoP2e4yJSyflHFO4dr0OrdnGLe1Zi/8Xo/2+M1dSSEt196rXaC kwu2KgIgmkRBb3cp2vIBBIIowU8W3qC1+w+RdMUrZxKGWJ3juwcgveJlzMpMZNyM1jobSXZ0 VHGMNJ3MwXlrEFPXaYJgibcg6brM6wGfX/LBvc/haWw4yO24lT5eitm4UBdIy9pKkKmHHh7s jfZJkB5fWKVdoCv/omy6UyH6ykLOPFugl+hVL2Prf8xrXuZe1CMS7ID9Lc8FaL1ROIN/W8Vk BIsJMaWOhks//7d92Uf3EArDlDShwR2+D+AMon8NULuLBHiEUQARAQABzTJHdWVudGVyIFJv ZWNrIChMaW51eCBhY2NvdW50KSA8bGludXhAcm9lY2stdXMubmV0PsLBgQQTAQIAKwIbAwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4ACGQEFAlVcphcFCRmg06EACgkQyx8mb86fmYFg0RAA nzXJzuPkLJaOmSIzPAqqnutACchT/meCOgMEpS5oLf6xn5ySZkl23OxuhpMZTVX+49c9pvBx hpvl5bCWFu5qC1jC2eWRYU+aZZE4sxMaAGeWenQJsiG9lP8wkfCJP3ockNu0ZXXAXwIbY1O1 c+l11zQkZw89zNgWgKobKzrDMBFOYtAh0pAInZ9TSn7oA4Ctejouo5wUugmk8MrDtUVXmEA9 7f9fgKYSwl/H7dfKKsS1bDOpyJlqhEAH94BHJdK/b1tzwJCFAXFhMlmlbYEk8kWjcxQgDWMu GAthQzSuAyhqyZwFcOlMCNbAcTSQawSo3B9yM9mHJne5RrAbVz4TWLnEaX8gA5xK3uCNCeyI sqYuzA4OzcMwnnTASvzsGZoYHTFP3DQwf2nzxD6yBGCfwNGIYfS0i8YN8XcBgEcDFMWpOQhT Pu3HeztMnF3HXrc0t7e5rDW9zCh3k2PA6D2NV4fews9KDFhLlTfCVzf0PS1dRVVWM+4jVl6l HRIAgWp+2/f8dx5vPc4Ycp4IsZN0l1h9uT7qm1KTwz+sSl1zOqKD/BpfGNZfLRRxrXthvvY8 BltcuZ4+PGFTcRkMytUbMDFMF9Cjd2W9dXD35PEtvj8wnEyzIos8bbgtLrGTv/SYhmPpahJA l8hPhYvmAvpOmusUUyB30StsHIU2LLccUPPOwU0ETofVZwEQALlLbQeBDTDbwQYrj0gbx3bq 7kpKABxN2MqeuqGr02DpS9883d/t7ontxasXoEz2GTioevvRmllJlPQERVxM8gQoNg22twF7 pB/zsrIjxkE9heE4wYfN1AyzT+AxgYN6f8hVQ7Nrc9XgZZe+8IkuW/Nf64KzNJXnSH4u6nJM J2+Dt274YoFcXR1nG76Q259mKwzbCukKbd6piL+VsT/qBrLhZe9Ivbjq5WMdkQKnP7gYKCAi pNVJC4enWfivZsYupMd9qn7Uv/oCZDYoBTdMSBUblaLMwlcjnPpOYK5rfHvC4opxl+P/Vzyz 6WC2TLkPtKvYvXmdsI6rnEI4Uucg0Au/Ulg7aqqKhzGPIbVaL+U0Wk82nz6hz+WP2ggTrY1w ZlPlRt8WM9w6WfLf2j+PuGklj37m+KvaOEfLsF1v464dSpy1tQVHhhp8LFTxh/6RWkRIR2uF I4v3Xu/k5D0LhaZHpQ4C+xKsQxpTGuYh2tnRaRL14YMW1dlI3HfeB2gj7Yc8XdHh9vkpPyuT nY/ZsFbnvBtiw7GchKKri2gDhRb2QNNDyBnQn5mRFw7CyuFclAksOdV/sdpQnYlYcRQWOUGY HhQ5eqTRZjm9z+qQe/T0HQpmiPTqQcIaG/edgKVTUjITfA7AJMKLQHgp04Vylb+G6jocnQQX JqvvP09whbqrABEBAAHCwWUEGAECAA8CGwwFAlVcpi8FCRmg08MACgkQyx8mb86fmYHNRQ/+ J0OZsBYP4leJvQF8lx9zif+v4ZY/6C9tTcUv/KNAE5leyrD4IKbnV4PnbrVhjq861it/zRQW cFpWQszZyWRwNPWUUz7ejmm9lAwPbr8xWT4qMSA43VKQ7ZCeTQJ4TC8kjqtcbw41SjkjrcTG wF52zFO4bOWyovVAPncvV9eGA/vtnd3xEZXQiSt91kBSqK28yjxAqK/c3G6i7IX2rg6pzgqh hiH3/1qM2M/LSuqAv0Rwrt/k+pZXE+B4Ud42hwmMr0TfhNxG+X7YKvjKC+SjPjqp0CaztQ0H nsDLSLElVROxCd9m8CAUuHplgmR3seYCOrT4jriMFBtKNPtj2EE4DNV4s7k0Zy+6iRQ8G8ng QjsSqYJx8iAR8JRB7Gm2rQOMv8lSRdjva++GT0VLXtHULdlzg8VjDnFZ3lfz5PWEOeIMk7Rj trjv82EZtrhLuLjHRCaG50OOm0hwPSk1J64R8O3HjSLdertmw7eyAYOo4RuWJguYMg5DRnBk WkRwrSuCn7UG+qVWZeKEsFKFOkynOs3pVbcbq1pxbhk3TRWCGRU5JolI4ohy/7JV1TVbjiDI HP/aVnm6NC8of26P40Pg8EdAhajZnHHjA7FrJXsy3cyIGqvg9os4rNkUWmrCfLLsZDHD8FnU mDW4+i+XlNFUPUYMrIKi9joBhu18ssf5i5Q= Message-ID: <605c47b7-9199-85f1-89e0-bd768acd3d2d@roeck-us.net> Date: Sun, 24 May 2020 09:43:14 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200524153041.2361-1-gregkh@linuxfoundation.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/24/20 8:30 AM, Greg Kroah-Hartman wrote: > Sometimes it is better to unregister individual nodes instead of trying > to do them all at once with software_node_unregister_nodes(), so create > software_node_unregister() so that you can unregister them one at a > time. > > This is especially important when creating nodes in a hierarchy, with > parent -> children representations. Children always need to be removed > before a parent is, as the swnode logic assumes this is going to be the > case. > > Fix up the lib/test_printf.c fwnode_pointer() test which to use this new > function as it had the problem of tearing things down in the backwards > order. > > Fixes: f1ce39df508d ("lib/test_printf: Add tests for %pfw printk modifier") > Reported-by: Naresh Kamboju > Reported-by: kernel test robot > Cc: stable > Cc: Andy Shevchenko > Cc: Brendan Higgins > Cc: Dmitry Torokhov > Cc: Heikki Krogerus > Cc: Petr Mladek > Cc: Rafael J. Wysocki > Cc: Randy Dunlap > Cc: Rasmus Villemoes > Cc: Sakari Ailus > Cc: Sergey Senozhatsky > Cc: Steven Rostedt > Signed-off-by: Greg Kroah-Hartman Both patches pass my boot tests on arm64 and arm64be (I didn't test any others). So, FWIW, Tested-by: Guenter Roeck I wasn't sure it the two patches replace or fix commit 4ef12f719802 ("kobject: Make sure the parent does not get released before its children"), so I tried to re-apply 4ef12f719802 on top of the two patches. Unfortunately that still results in crashes and UAF messages. Guenter