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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: Tue, 20 Oct 2026 12:44:33 -0400 Message-ID: <20261020164435.80499-8-djeffery@redhat.com> In-Reply-To: <20261020164435.80499-1-djeffery@redhat.com> References: <20261020164435.80499-1-djeffery@redhat.com> X-Archived-By: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-MFC-PROC-ID: 9K7KM7EBhuIibWb1ISC8APgVp05iDTsPieEpFjb0kVo_1792514711 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-20261020_094518_685468_800623CD X-CRM114-Status: GOOD ( 12.85 ) X-Spam-Score: 1.2 (+) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" X-Spam-Status: No, score=-16.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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