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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 77C56C433E6 for ; Mon, 8 Mar 2021 19:36:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 493B665287 for ; Mon, 8 Mar 2021 19:36:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231254AbhCHTfl (ORCPT ); Mon, 8 Mar 2021 14:35:41 -0500 Received: from mail-pf1-f181.google.com ([209.85.210.181]:34252 "EHLO mail-pf1-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230173AbhCHTfO (ORCPT ); Mon, 8 Mar 2021 14:35:14 -0500 Received: by mail-pf1-f181.google.com with SMTP id m6so7907556pfk.1; Mon, 08 Mar 2021 11:35:14 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=aqpkkYWGnOlTlzWLy40cJ0EmokNsDDvU2Mb4GyPS4Mg=; b=NK/GUx3R+lvj5/5s7sEqEXllJ3H0xkuFVUrjX5PGd9iM/NW4Kr4zU4iHPFLWwbdfjw PCqzggC/p6fQusJVwb/kchxsiTxSeTyPvryGKl7XT3HuamAM6K3Eizh7niJ606Nz2S0a fVuc35m33uSv0ehKr4yP+ivIEeJhVJJWflQ8ypV8BkI00tLDlczBFnlmqPlDCExKhcF6 A3Ekq8Dn4MKApfsMtKJrs3aU9CA+vN/cDEM0JGWT9+dcnCyZ1cYGG7StIjYb3KS5pNHq kulKPGM+6qjm0/VUH3hv4KkJLdPhyR0l8whRCBdGDDaPPONtSyxSmVTzwq1vS4Serjvm FWdA== X-Gm-Message-State: AOAM5305E0GGg+Vg53SRHiotrQlzcqfxo5rJ2/Q9op+C6uQACblH1xi6 Ts9lw5lF03qmSZBHjbRspN3TUXNI90U= X-Google-Smtp-Source: ABdhPJyys2y6Oghr6FgnxHSnbk0vV9AazIS4kJDgos6RFCLPrPRCbuaZWIxac9CkC2nxz/dGrtMIBw== X-Received: by 2002:a62:6304:0:b029:1c0:d62d:d213 with SMTP id x4-20020a6263040000b02901c0d62dd213mr22523518pfb.79.1615232114106; Mon, 08 Mar 2021 11:35:14 -0800 (PST) Received: from [192.168.51.110] (c-73-241-217-19.hsd1.ca.comcast.net. [73.241.217.19]) by smtp.gmail.com with ESMTPSA id t12sm82201pga.85.2021.03.08.11.35.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Mar 2021 11:35:13 -0800 (PST) Subject: Re: [RFC PATCH v3 2/3] blk-mq: Freeze and quiesce all queues for tagset in elevator_exit() To: John Garry , hare@suse.de, ming.lei@redhat.com, axboe@kernel.dk, hch@lst.de Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, pragalla@codeaurora.org, kashyap.desai@broadcom.com, yuyufen@huawei.com References: <1614957294-188540-1-git-send-email-john.garry@huawei.com> <1614957294-188540-3-git-send-email-john.garry@huawei.com> <52618092-07ca-ecb5-320f-957af26ab146@acm.org> <3c6cbe11-ac31-9a47-0096-17fbd584b83e@huawei.com> From: Bart Van Assche Message-ID: <072178c2-a112-8f35-8f60-e5c1396561d7@acm.org> Date: Mon, 8 Mar 2021 11:35:11 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <3c6cbe11-ac31-9a47-0096-17fbd584b83e@huawei.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 3/8/21 2:50 AM, John Garry wrote: > Please let me know further thoughts. Hi John, My guess is that it is safe to nest these two locks. I was asking because I had not found any information about the nesting in the patch description. Bart.