Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S942680AbcJZM7s (ORCPT ); Wed, 26 Oct 2016 08:59:48 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:55815 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S942148AbcJZMdG (ORCPT ); Wed, 26 Oct 2016 08:33:06 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bart Van Assche , Mike Snitzer Subject: [PATCH 4.4 022/112] dm: mark request_queue dead before destroying the DM device Date: Wed, 26 Oct 2016 14:22:05 +0200 Message-Id: <20161026122305.730178756@linuxfoundation.org> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161026122304.797016625@linuxfoundation.org> References: <20161026122304.797016625@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1116 Lines: 41 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bart Van Assche commit 3b785fbcf81c3533772c52b717f77293099498d3 upstream. This avoids that new requests are queued while __dm_destroy() is in progress. Signed-off-by: Bart Van Assche Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2869,6 +2869,7 @@ EXPORT_SYMBOL_GPL(dm_device_name); static void __dm_destroy(struct mapped_device *md, bool wait) { + struct request_queue *q = dm_get_md_queue(md); struct dm_table *map; int srcu_idx; @@ -2879,6 +2880,10 @@ static void __dm_destroy(struct mapped_d set_bit(DMF_FREEING, &md->flags); spin_unlock(&_minor_lock); + spin_lock_irq(q->queue_lock); + queue_flag_set(QUEUE_FLAG_DYING, q); + spin_unlock_irq(q->queue_lock); + if (dm_request_based(md) && md->kworker_task) flush_kthread_worker(&md->kworker);