From patchwork Thu May 20 09:22:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 444368 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 4CD94C4363F for ; Thu, 20 May 2021 10:14:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 279A6613EE for ; Thu, 20 May 2021 10:14:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235006AbhETKPo (ORCPT ); Thu, 20 May 2021 06:15:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:47766 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235914AbhETKM5 (ORCPT ); Thu, 20 May 2021 06:12:57 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DA58C6196A; Thu, 20 May 2021 09:44:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621503847; bh=H1R+rLLmIe7smj8gAMNssW7E/wdXH7IoIX0djuumc5c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FhdxCiItXX0JiWMoeHr7wrytw4YvIZbVSFBsjsO5Nlz/4eRawcDxxXkYzhkgVooDK 4eEFSthpLgFceTmFdfH3X9D85fu1ROTlNuoBwTwW6R4jbhCgIM9O2R8mxt+iKtn6Bl MuIfRZ7SbjrqzSIsZA/+0KT+UedLebE65cbKMaQY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christoph Hellwig , Ming Lei , Hannes Reinecke , Bart Van Assche , Jens Axboe , Sasha Levin Subject: [PATCH 4.19 372/425] blk-mq: Swap two calls in blk_mq_exit_queue() Date: Thu, 20 May 2021 11:22:21 +0200 Message-Id: <20210520092143.624731783@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092131.308959589@linuxfoundation.org> References: <20210520092131.308959589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bart Van Assche [ Upstream commit 630ef623ed26c18a457cdc070cf24014e50129c2 ] If a tag set is shared across request queues (e.g. SCSI LUNs) then the block layer core keeps track of the number of active request queues in tags->active_queues. blk_mq_tag_busy() and blk_mq_tag_idle() update that atomic counter if the hctx flag BLK_MQ_F_TAG_QUEUE_SHARED is set. Make sure that blk_mq_exit_queue() calls blk_mq_tag_idle() before that flag is cleared by blk_mq_del_queue_tag_set(). Cc: Christoph Hellwig Cc: Ming Lei Cc: Hannes Reinecke Fixes: 0d2602ca30e4 ("blk-mq: improve support for shared tags maps") Signed-off-by: Bart Van Assche Reviewed-by: Ming Lei Link: https://lore.kernel.org/r/20210513171529.7977-1-bvanassche@acm.org Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/blk-mq.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2673,10 +2673,12 @@ EXPORT_SYMBOL(blk_mq_init_allocated_queu /* tags can _not_ be used after returning from blk_mq_exit_queue */ void blk_mq_exit_queue(struct request_queue *q) { - struct blk_mq_tag_set *set = q->tag_set; + struct blk_mq_tag_set *set = q->tag_set; - blk_mq_del_queue_tag_set(q); + /* Checks hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED. */ blk_mq_exit_hw_queues(q, set, set->nr_hw_queues); + /* May clear BLK_MQ_F_TAG_QUEUE_SHARED in hctx->flags. */ + blk_mq_del_queue_tag_set(q); } /* Basically redo blk_mq_init_queue with queue frozen */