From patchwork Tue Oct 25 10:17:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 618678 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0C29C04A95 for ; Tue, 25 Oct 2022 09:48:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231363AbiJYJsO (ORCPT ); Tue, 25 Oct 2022 05:48:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231379AbiJYJsG (ORCPT ); Tue, 25 Oct 2022 05:48:06 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F3D1110B0E; Tue, 25 Oct 2022 02:48:04 -0700 (PDT) Received: from fraeml705-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4MxRqL71Xnz6893Q; Tue, 25 Oct 2022 17:44:30 +0800 (CST) Received: from lhrpeml500003.china.huawei.com (7.191.162.67) by fraeml705-chm.china.huawei.com (10.206.15.54) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2375.31; Tue, 25 Oct 2022 11:48:00 +0200 Received: from localhost.localdomain (10.69.192.58) by lhrpeml500003.china.huawei.com (7.191.162.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 25 Oct 2022 10:47:57 +0100 From: John Garry To: , , , , , , , , , CC: , , , , , John Garry Subject: [PATCH RFC v3 02/22] scsi: core: Add scsi_get_dev() Date: Tue, 25 Oct 2022 18:17:56 +0800 Message-ID: <1666693096-180008-3-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1666693096-180008-1-git-send-email-john.garry@huawei.com> References: <1666693096-180008-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.69.192.58] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To lhrpeml500003.china.huawei.com (7.191.162.67) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add a function which allows us to alloc a sdev with configurable device parent, and channel:id:lun This is useful for separating adding a scsi device into separate alloc and scan steps Signed-off-by: John Garry --- drivers/scsi/scsi_scan.c | 25 +++++++++++++++++++++++++ include/scsi/scsi_host.h | 4 ++++ 2 files changed, 29 insertions(+) diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 5d27f5196de6..ad0a5902d1a0 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -1979,3 +1979,28 @@ void scsi_forget_host(struct Scsi_Host *shost) spin_unlock_irqrestore(shost->host_lock, flags); } +struct scsi_device *scsi_get_dev(struct device *parent, int channel, uint id, u64 lun) +{ + struct Scsi_Host *shost = dev_to_shost(parent); + struct scsi_device *sdev = NULL; + struct scsi_target *starget; + + mutex_lock(&shost->scan_mutex); + if (!scsi_host_scan_allowed(shost)) + goto out; + + starget = scsi_alloc_target(parent, channel, id); + if (!starget) + goto out; + + sdev = scsi_alloc_sdev(starget, lun, NULL); + if (sdev) + sdev->borken = 0; + else + scsi_target_reap(starget); + put_device(&starget->dev); + out: + mutex_unlock(&shost->scan_mutex); + return sdev; +} +EXPORT_SYMBOL(scsi_get_dev); diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index e71436183c0d..750ccf126377 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -787,6 +787,10 @@ void scsi_host_busy_iter(struct Scsi_Host *, struct class_container; + +extern struct scsi_device *scsi_get_dev(struct device *parent, int channel, + uint id, u64 lun); + /* * DIF defines the exchange of protection information between * initiator and SBC block device.