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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 52C90C982D7 for ; Thu, 17 Sep 2026 16:38:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:content-type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=6CVM95O8nJA2j5PntuVbYrjGyYXMZc4AlBaFKMW1Qic=; b=42T/IqFWPIS5D8+5bQv1UCslnZ ebS7SgIxNVDJfHr/AddtVW/sMnJoD7VuWQSGLKs/7UPuqIywsAYAsK21OF62acOnp5ITf+6H/fURV rg0A2dwxdfY5ZxzGx2ti9K36kaF39RIJvCUmzOhot0yLBxImgE/IU2QphB4PQOEqcMswAP/wX0RRv 9W0m3rbE9dugFVnkTfgXJI2pI8yxmRKGXWkJYY3mzOhD6x43Zu4B+qYKNvZm52OxB+wlU6c0Dki1H s4tVWNkJKFUVeYywezPaWQQUAX0f9XB5j28sjdibsxitxXHsU7xMdd9dvu0g/1CLigyuq8mhW/AGq svwPhFYg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x7F83-0000000Bwk6-1OWS; Thu, 17 Sep 2026 16:38:31 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x7F81-0000000Bwia-3O1o for kexec@lists.infradead.org; Thu, 17 Sep 2026 16:38:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1789663108; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6CVM95O8nJA2j5PntuVbYrjGyYXMZc4AlBaFKMW1Qic=; b=akPbqVMARnrsgtCyl0dA+RYFbVoDxkE/gboQqMPpMMV9E8w5ddwrmHMoja/2FmeBHXicOu AfznyU5OKnMCba7qhu6J2vV277LW0Ryh9zm6iUXviz5nh8BTs9Haqvgb4xPcPKyZVUO4yt cSgXBXVr4c28ME3QgOTjQ7r9p0IFZnY= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-489-IyQ06wh3MyeKK2BB8h10PA-1; Thu, 17 Sep 2026 12:38:23 -0400 X-MC-Unique: IyQ06wh3MyeKK2BB8h10PA-1 X-Mimecast-MFC-AGG-ID: IyQ06wh3MyeKK2BB8h10PA_1789663100 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id C82E21955DB3; Thu, 17 Sep 2026 16:38:20 +0000 (UTC) Received: from djeffery-thinkpadp1gen3.rmtusga.csb (headnet03.pony-001.prod.iad2.dc.redhat.com [10.2.32.114]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 8430C1800361; Thu, 17 Sep 2026 16:38:17 +0000 (UTC) From: David Jeffery To: driver-core@lists.linux.dev, Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-scsi@vger.kernel.org, Tarun Sahu , Stuart Hayes , Laurence Oberman , Bjorn Helgaas , kexec@lists.infradead.org, "Ewan Milne" , "John Meneghini" , "Lombardi, Maurizio" , "Bart Van Assche" , "John Garry" , "Jeremy Allison" , "Martin K . Petersen" , "Pasha Tatashin" , David Jeffery , Bjorn Helgaas Subject: [PATCH 7/9] PCI: Link a virtual function to its physical function Date: Thu, 17 Sep 2026 12:37:42 -0400 Message-ID: <20260917163744.191748-8-djeffery@redhat.com> In-Reply-To: <20260917163744.191748-1-djeffery@redhat.com> References: <20260917163744.191748-1-djeffery@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Mimecast-MFC-PROC-ID: 9CzcgIVjLsLCtuNgIJCuisKzlUMv43lL6y-HymmY4tc_1789663100 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260917_093829_916648_87DEB8A3 X-CRM114-Status: GOOD ( 12.61 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org With a PCI virtual function having the same bus for its parent as the physical function it is associated with, there is no explicit dependency between the two in the device tree. With async shutdown, this can result in the PF being shutdown before the VF has an opportunity to shutdown. Link the VF as a consumer of the PF to note its dependency and ensure clean shutdown ordering. Signed-off-by: Tarun Sahu Signed-off-by: David Jeffery Tested-by: Laurence Oberman Reviewed-by: Bjorn Helgaas --- drivers/pci/iov.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 9d408fb8ac25..9b74211c6ab4 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -382,14 +382,20 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id) } pci_device_add(virtfn, virtfn->bus); + if (!device_link_add(&virtfn->dev, &dev->dev, DL_FLAG_STATELESS)) { + rc = -ENOMEM; + goto failed1; + } + rc = pci_iov_sysfs_link(dev, virtfn, id); if (rc) - goto failed1; + goto unlink; pci_bus_add_device(virtfn); return 0; - +unlink: + device_link_remove(&virtfn->dev, &dev->dev); failed1: pci_stop_and_remove_bus_device(virtfn); pci_dev_put(dev); @@ -421,6 +427,7 @@ void pci_iov_remove_virtfn(struct pci_dev *dev, int id) if (virtfn->dev.kobj.sd) sysfs_remove_link(&virtfn->dev.kobj, "physfn"); + device_link_remove(&virtfn->dev, &dev->dev); pci_stop_and_remove_bus_device(virtfn); virtfn_remove_bus(dev->bus, virtfn->bus); -- 2.55.0