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 2546DC76196 for ; Mon, 3 Apr 2023 05:21:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231496AbjDCFVo (ORCPT ); Mon, 3 Apr 2023 01:21:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231390AbjDCFVn (ORCPT ); Mon, 3 Apr 2023 01:21:43 -0400 Received: from mp-relay-01.fibernetics.ca (mp-relay-01.fibernetics.ca [208.85.217.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6851EB463; Sun, 2 Apr 2023 22:21:40 -0700 (PDT) Received: from mailpool-fe-02.fibernetics.ca (mailpool-fe-02.fibernetics.ca [208.85.217.145]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mp-relay-01.fibernetics.ca (Postfix) with ESMTPS id 81EF3E1AC3; Mon, 3 Apr 2023 05:21:39 +0000 (UTC) Received: from localhost (mailpool-mx-01.fibernetics.ca [208.85.217.140]) by mailpool-fe-02.fibernetics.ca (Postfix) with ESMTP id 70093609E9; Mon, 3 Apr 2023 05:21:39 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at Received: from mailpool-fe-02.fibernetics.ca ([208.85.217.145]) by localhost (mail-mx-01.fibernetics.ca [208.85.217.140]) (amavisd-new, port 10024) with ESMTP id Lxs6gqH2fgK7; Mon, 3 Apr 2023 05:21:39 +0000 (UTC) Received: from [192.168.48.17] (host-184-164-23-94.dyn.295.ca [184.164.23.94]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) (Authenticated sender: dgilbert@interlog.com) by mail.ca.inter.net (Postfix) with ESMTPSA id C6C5560529; Mon, 3 Apr 2023 05:21:38 +0000 (UTC) Message-ID: <40fbe93a-c39f-9887-2fe7-93532fee4771@interlog.com> Date: Mon, 3 Apr 2023 01:21:38 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.1 Reply-To: dgilbert@interlog.com Subject: Re: [PATCH v3 09/11] scsi: scsi_debug: Use scsi_host_busy() in delay_store() and ndelay_store() Content-Language: en-CA To: John Garry , jejb@linux.ibm.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, bvanassche@acm.org References: <20230327074310.1862889-1-john.g.garry@oracle.com> <20230327074310.1862889-10-john.g.garry@oracle.com> From: Douglas Gilbert In-Reply-To: <20230327074310.1862889-10-john.g.garry@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On 2023-03-27 03:43, John Garry wrote: > The functions to update ndelay and delay value first check whether we have > any in-flight IO for any host. It does this by checking if any tag is used > in the global submit queues. > > We can achieve the same by setting the host as blocked and then ensuring > that we have no in-flight commands with scsi_host_busy(). > > Note that scsi_host_busy() checks SCMD_STATE_INFLIGHT flag, which is only > set per command after we ensure that the host is not blocked, i.e. we > see more commands active after the check for scsi_host_busy() returns 0. > > Signed-off-by: John Garry Acked-by: Douglas Gilbert Thanks.