From patchwork Thu Dec 13 13:56:23 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Herton Ronaldo Krzesinski X-Patchwork-Id: 205868 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from chlorine.canonical.com (chlorine.canonical.com [91.189.94.204]) by ozlabs.org (Postfix) with ESMTP id C33242C009A for ; Fri, 14 Dec 2012 01:02:43 +1100 (EST) Received: from localhost ([127.0.0.1] helo=chlorine.canonical.com) by chlorine.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1Tj9Mt-0000Rr-31; Thu, 13 Dec 2012 14:02:31 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by chlorine.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1Tj9MB-0008TP-Qo for kernel-team@lists.ubuntu.com; Thu, 13 Dec 2012 14:01:47 +0000 Received: from 200.139.123.215.dynamic.adsl.gvt.net.br ([200.139.123.215] helo=canonical.com) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1Tj9MA-00046Y-JS; Thu, 13 Dec 2012 14:01:47 +0000 From: Herton Ronaldo Krzesinski To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Subject: [PATCH 018/241] floppy: don't call alloc_ordered_workqueue inside the alloc_disk loop Date: Thu, 13 Dec 2012 11:56:23 -0200 Message-Id: <1355407206-17100-19-git-send-email-herton.krzesinski@canonical.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1355407206-17100-1-git-send-email-herton.krzesinski@canonical.com> References: <1355407206-17100-1-git-send-email-herton.krzesinski@canonical.com> Cc: Jens Axboe , Jiri Kosina X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.13 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: kernel-team-bounces@lists.ubuntu.com Errors-To: kernel-team-bounces@lists.ubuntu.com 3.5.7.2 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Herton Ronaldo Krzesinski commit b54e1f88897bcacc2cd359f48ea3b39eaf55f084 upstream. Since commit 070ad7e ("floppy: convert to delayed work and single-thread wq"), we end up calling alloc_ordered_workqueue multiple times inside the loop, which shouldn't be intended. Besides the leak, other side effect in the current code is if blk_init_queue fails, we would end up calling unregister_blkdev even if we didn't call yet register_blkdev. Just moved the allocation of floppy_wq before the loop, and adjusted the code accordingly. Acked-by: Vivek Goyal Reviewed-by: Ben Hutchings Signed-off-by: Jiri Kosina Signed-off-by: Jens Axboe Signed-off-by: Herton Ronaldo Krzesinski --- drivers/block/floppy.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index 553f43a..3817084 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -4138,6 +4138,10 @@ static int __init floppy_init(void) raw_cmd = NULL; + floppy_wq = alloc_ordered_workqueue("floppy", 0); + if (!floppy_wq) + return -ENOMEM; + for (dr = 0; dr < N_DRIVE; dr++) { disks[dr] = alloc_disk(1); if (!disks[dr]) { @@ -4145,16 +4149,10 @@ static int __init floppy_init(void) goto out_put_disk; } - floppy_wq = alloc_ordered_workqueue("floppy", 0); - if (!floppy_wq) { - err = -ENOMEM; - goto out_put_disk; - } - disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock); if (!disks[dr]->queue) { err = -ENOMEM; - goto out_destroy_workq; + goto out_put_disk; } blk_queue_max_hw_sectors(disks[dr]->queue, 64); @@ -4318,8 +4316,6 @@ out_release_dma: out_unreg_region: blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); platform_driver_unregister(&floppy_driver); -out_destroy_workq: - destroy_workqueue(floppy_wq); out_unreg_blkdev: unregister_blkdev(FLOPPY_MAJOR, "fd"); out_put_disk: @@ -4335,6 +4331,7 @@ out_put_disk: } put_disk(disks[dr]); } + destroy_workqueue(floppy_wq); return err; }