Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753113AbdHISSn (ORCPT ); Wed, 9 Aug 2017 14:18:43 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:59728 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750770AbdHISSm (ORCPT ); Wed, 9 Aug 2017 14:18:42 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jeff Moyer , Omar Sandoval , Josef Bacik , Jens Axboe , Sasha Levin Subject: [PATCH 4.9 84/93] nbd: blk_mq_init_queue returns an error code on failure, not NULL Date: Wed, 9 Aug 2017 11:14:17 -0700 Message-Id: <20170809181339.056910739@linuxfoundation.org> X-Mailer: git-send-email 2.14.0 In-Reply-To: <20170809181335.658857427@linuxfoundation.org> References: <20170809181335.658857427@linuxfoundation.org> User-Agent: quilt/0.65 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: 1606 Lines: 53 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jeff Moyer [ Upstream commit 25b4acfc7de0fc4da3bfea3a316f7282c6fbde81 ] Additionally, don't assign directly to disk->queue, otherwise blk_put_queue (called via put_disk) will choke (panic) on the errno stored there. Bug found by code inspection after Omar found a similar issue in virtio_blk. Compile-tested only. Signed-off-by: Jeff Moyer Reviewed-by: Omar Sandoval Reviewed-by: Josef Bacik Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/block/nbd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -929,6 +929,7 @@ static int __init nbd_init(void) return -ENOMEM; for (i = 0; i < nbds_max; i++) { + struct request_queue *q; struct gendisk *disk = alloc_disk(1 << part_shift); if (!disk) goto out; @@ -954,12 +955,13 @@ static int __init nbd_init(void) * every gendisk to have its very own request_queue struct. * These structs are big so we dynamically allocate them. */ - disk->queue = blk_mq_init_queue(&nbd_dev[i].tag_set); - if (!disk->queue) { + q = blk_mq_init_queue(&nbd_dev[i].tag_set); + if (IS_ERR(q)) { blk_mq_free_tag_set(&nbd_dev[i].tag_set); put_disk(disk); goto out; } + disk->queue = q; /* * Tell the block layer that we are not a rotational device