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GET /api/1.1/patches/2220595/?format=api
{ "id": 2220595, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2220595/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260407153532.6395-3-djeffery@redhat.com/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/1.1/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<20260407153532.6395-3-djeffery@redhat.com>", "date": "2026-04-07T15:35:29", "name": "[2/5] driver core: do not always lock parent in shutdown", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "f762748dc815dc4117298e7510d7ba530221e588", "submitter": { "id": 24471, "url": "http://patchwork.ozlabs.org/api/1.1/people/24471/?format=api", "name": "David Jeffery", "email": "djeffery@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260407153532.6395-3-djeffery@redhat.com/mbox/", "series": [ { "id": 498998, "url": "http://patchwork.ozlabs.org/api/1.1/series/498998/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=498998", "date": "2026-04-07T15:35:27", "name": "shut down devices asynchronously", "version": 13, "mbox": "http://patchwork.ozlabs.org/series/498998/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220595/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220595/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-pci+bounces-52082-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=RI14z00S;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n\ts=mimecast20190719; t=1775576164;\n\th=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n\t to:to:cc:cc:mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=Xf8VBa3s5TDbzdGc7YU+V5MBvNbOIU1Be5qZpIougPY=;\n\tb=RI14z00SUCmTWktqV8nC6iozWs4/m0AGXfWINzYopAH/1hgaYWUwBTo44xGVUgvaPRGOFh\n\tY7EsFJX3iT5WH5VUzd/9BG+ZxpT3tjR21rHpunaDyGSruyxfHuw0Y1yFzlCV1OG22NvjSG\n\tnF+p+FA6o8sRpCTviyfjBXE76/8Sl9w=", "X-MC-Unique": "EltgH6WzOTqdn50Q92ivvQ-1", "X-Mimecast-MFC-AGG-ID": "EltgH6WzOTqdn50Q92ivvQ_1775576158", "From": "David Jeffery <djeffery@redhat.com>", "To": "linux-kernel@vger.kernel.org,\n\tdriver-core@lists.linux.dev,\n\tlinux-pci@vger.kernel.org,\n\tlinux-scsi@vger.kernel.org,\n\tGreg Kroah-Hartman <gregkh@linuxfoundation.org>,\n\t\"Rafael J. Wysocki\" <rafael@kernel.org>,\n\tDanilo Krummrich <dakr@kernel.org>", "Cc": "Tarun Sahu <tarunsahu@google.com>, Pasha Tatashin <tatashin@google.com>,\n\t=?utf-8?b?TWljaGHFgiBDxYJhcGnFhHNraQ==?= <mclapinski@google.com>,\n Jordan Richards <jordanrichards@google.com>, Ewan Milne <emilne@redhat.com>,\n John Meneghini <jmeneghi@redhat.com>, \"Lombardi,\n Maurizio\" <mlombard@redhat.com>, Stuart Hayes <stuart.w.hayes@gmail.com>,\n Laurence Oberman <loberman@redhat.com>, Bart Van Assche <bvanassche@acm.org>,\n Bjorn Helgaas <helgaas@kernel.org>,\n \"Martin K . Petersen\" <martin.petersen@oracle.com>,\n David Jeffery <djeffery@redhat.com>", "Subject": "[PATCH 2/5] driver core: do not always lock parent in shutdown", "Date": "Tue, 7 Apr 2026 11:35:29 -0400", "Message-ID": "<20260407153532.6395-3-djeffery@redhat.com>", "In-Reply-To": "<20260407153532.6395-1-djeffery@redhat.com>", "References": "<20260407153532.6395-1-djeffery@redhat.com>", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.111" }, "content": "Don't lock a parent device unless it is needed in device_shutdown. This\nis in preparation for making device shutdown asynchronous, when it will\nbe needed to allow children of a common parent to shut down\nsimultaneously.\n\nAnd only acquire a reference to the parent device if the parent is to be\nlocked.\n\nSigned-off-by: Stuart Hayes <stuart.w.hayes@gmail.com>\nSigned-off-by: David Jeffery <djeffery@redhat.com>\nTested-by: Laurence Oberman <loberman@redhat.com>\n---\n drivers/base/core.c | 30 ++++++++++++++++--------------\n 1 file changed, 16 insertions(+), 14 deletions(-)", "diff": "diff --git a/drivers/base/core.c b/drivers/base/core.c\nindex fabd17be1175..0fb2f3ccc3bd 100644\n--- a/drivers/base/core.c\n+++ b/drivers/base/core.c\n@@ -4784,13 +4784,8 @@ int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)\n \treturn error;\n }\n \n-static void shutdown_one_device(struct device *dev)\n+static void __shutdown_one_device(struct device *dev)\n {\n-\tstruct device *parent = dev->parent;\n-\n-\t/* hold lock to avoid race with probe/release */\n-\tif (parent)\n-\t\tdevice_lock(parent);\n \tdevice_lock(dev);\n \n \t/* Don't allow any more runtime suspends */\n@@ -4813,10 +4808,23 @@ static void shutdown_one_device(struct device *dev)\n \t}\n \n \tdevice_unlock(dev);\n-\tif (parent)\n+}\n+\n+static void shutdown_one_device(struct device *dev)\n+{\n+\tstruct device *parent;\n+\n+\t/* hold lock if needed to avoid race with probe/release */\n+\tif (dev->bus && dev->bus->need_parent_lock &&\n+\t (parent = get_device(dev->parent))) {\n+\t\tdevice_lock(parent);\n+\t\t__shutdown_one_device(dev);\n \t\tdevice_unlock(parent);\n+\t\tput_device(parent);\n+\t} else {\n+\t\t__shutdown_one_device(dev);\n+\t}\n \n-\tput_device(parent);\n \tput_device(dev);\n }\n \n@@ -4842,12 +4850,6 @@ void device_shutdown(void)\n \t\tdev = list_entry(devices_kset->list.prev, struct device,\n \t\t\t\tkobj.entry);\n \n-\t\t/*\n-\t\t * hold reference count of device's parent to\n-\t\t * prevent it from being freed because parent's\n-\t\t * lock is to be held\n-\t\t */\n-\t\tget_device(dev->parent);\n \t\tget_device(dev);\n \t\t/*\n \t\t * Make sure the device is off the kset list, in the\n", "prefixes": [ "2/5" ] }