From patchwork Tue Nov 21 13:42:32 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adrian Hunter X-Patchwork-Id: 10068059 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B9DD060375 for ; Tue, 21 Nov 2017 13:43:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ACED0295FC for ; Tue, 21 Nov 2017 13:43:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A16EB295FB; Tue, 21 Nov 2017 13:43:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1ACFF295FD for ; Tue, 21 Nov 2017 13:43:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751759AbdKUNnn (ORCPT ); Tue, 21 Nov 2017 08:43:43 -0500 Received: from mga02.intel.com ([134.134.136.20]:13823 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751731AbdKUNnm (ORCPT ); Tue, 21 Nov 2017 08:43:42 -0500 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Nov 2017 05:43:41 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,432,1505804400"; d="scan'208";a="5344651" Received: from ahunter-desktop.fi.intel.com ([10.237.72.168]) by fmsmga001.fm.intel.com with ESMTP; 21 Nov 2017 05:43:36 -0800 From: Adrian Hunter To: Ulf Hansson Cc: linux-mmc , linux-block , linux-kernel , Bough Chen , Alex Lemberg , Mateusz Nowak , Yuliy Izrailov , Jaehoon Chung , Dong Aisheng , Das Asutosh , Zhangfei Gao , Sahitya Tummala , Harjani Ritesh , Venu Byravarasu , Linus Walleij , Shawn Lin , Bartlomiej Zolnierkiewicz , Christoph Hellwig Subject: [PATCH V14 06/24] mmc: block: Simplify cleaning up the queue Date: Tue, 21 Nov 2017 15:42:32 +0200 Message-Id: <1511271770-3444-7-git-send-email-adrian.hunter@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1511271770-3444-1-git-send-email-adrian.hunter@intel.com> References: <1511271770-3444-1-git-send-email-adrian.hunter@intel.com> Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Use blk_cleanup_queue() to shutdown the queue when the driver is removed, and instead get an extra reference to the queue to prevent the queue being freed before the final mmc_blk_put(). Signed-off-by: Adrian Hunter Reviewed-by: Linus Walleij --- drivers/mmc/core/block.c | 17 ++++++++++++----- drivers/mmc/core/queue.c | 2 ++ 2 files changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index ccfa98af1dd3..e44f6d90aeb4 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -189,7 +189,7 @@ static void mmc_blk_put(struct mmc_blk_data *md) md->usage--; if (md->usage == 0) { int devidx = mmc_get_devidx(md->disk); - blk_cleanup_queue(md->queue.queue); + blk_put_queue(md->queue.queue); ida_simple_remove(&mmc_blk_ida, devidx); put_disk(md->disk); kfree(md); @@ -2156,6 +2156,17 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, md->queue.blkdata = md; + /* + * Keep an extra reference to the queue so that we can shutdown the + * queue (i.e. call blk_cleanup_queue()) while there are still + * references to the 'md'. The corresponding blk_put_queue() is in + * mmc_blk_put(). + */ + if (!blk_get_queue(md->queue.queue)) { + mmc_cleanup_queue(&md->queue); + goto err_putdisk; + } + md->disk->major = MMC_BLOCK_MAJOR; md->disk->first_minor = devidx * perdev_minors; md->disk->fops = &mmc_bdops; @@ -2471,10 +2482,6 @@ static void mmc_blk_remove_req(struct mmc_blk_data *md) * from being accepted. */ card = md->queue.card; - spin_lock_irq(md->queue.queue->queue_lock); - queue_flag_set(QUEUE_FLAG_BYPASS, md->queue.queue); - spin_unlock_irq(md->queue.queue->queue_lock); - blk_set_queue_dying(md->queue.queue); mmc_cleanup_queue(&md->queue); if (md->disk->flags & GENHD_FL_UP) { device_remove_file(disk_to_dev(md->disk), &md->force_ro); diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c index 26f8da30ebe5..ae6d9da68735 100644 --- a/drivers/mmc/core/queue.c +++ b/drivers/mmc/core/queue.c @@ -268,6 +268,8 @@ void mmc_cleanup_queue(struct mmc_queue *mq) blk_start_queue(q); spin_unlock_irqrestore(q->queue_lock, flags); + blk_cleanup_queue(q); + mq->card = NULL; }