From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 92C71C43331 for ; Mon, 11 Nov 2019 01:42:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D526204EC for ; Mon, 11 Nov 2019 01:42:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726742AbfKKBma (ORCPT ); Sun, 10 Nov 2019 20:42:30 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:6176 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726733AbfKKBma (ORCPT ); Sun, 10 Nov 2019 20:42:30 -0500 Received: from DGGEMS414-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 988E55D1D787317EDE88; Mon, 11 Nov 2019 09:42:27 +0800 (CST) Received: from huawei.com (10.90.53.225) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.439.0; Mon, 11 Nov 2019 09:42:22 +0800 From: Hou Tao To: CC: Jens Axboe Subject: [PATCH] block: genhd: skip blk_register_region() for disk using ext-dev Date: Mon, 11 Nov 2019 09:49:46 +0800 Message-ID: <20191111014946.54533-1-houtao1@huawei.com> X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.90.53.225] X-CFilter-Loop: Reflected Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org It doesn't incur any harm now when the range parameter of blk_register_region() is zero, but let's skip the useless call of blk_register_region() for disk which uses ext-dev. Signed-off-by: Hou Tao --- block/genhd.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 26b31fcae217..c61b59b550b0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -739,8 +739,9 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, ret = bdi_register_owner(disk->queue->backing_dev_info, disk_to_dev(disk)); WARN_ON(ret); - blk_register_region(disk_devt(disk), disk->minors, NULL, - exact_match, exact_lock, disk); + if (disk->minors) + blk_register_region(disk_devt(disk), disk->minors, NULL, + exact_match, exact_lock, disk); } register_disk(parent, disk, groups); if (register_queue) -- 2.22.0