{"id":2227520,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2227520/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260423212316.3431746-5-dmatlack@google.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.1/projects/28/?format=json","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":"<20260423212316.3431746-5-dmatlack@google.com>","date":"2026-04-23T21:23:08","name":"[v4,04/11] PCI: liveupdate: Document driver binding responsibilities","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"5ecee589b513c72130f5193cefcf70bb94a730f1","submitter":{"id":69449,"url":"http://patchwork.ozlabs.org/api/1.1/people/69449/?format=json","name":"David Matlack","email":"dmatlack@google.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260423212316.3431746-5-dmatlack@google.com/mbox/","series":[{"id":501248,"url":"http://patchwork.ozlabs.org/api/1.1/series/501248/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/list/?series=501248","date":"2026-04-23T21:23:04","name":"PCI: liveupdate: PCI core support for Live Update","version":4,"mbox":"http://patchwork.ozlabs.org/series/501248/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227520/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2227520/checks/","tags":{},"headers":{"Return-Path":"\n ","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 (2048-bit key;\n unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256\n header.s=20251104 header.b=UpCaZjJy;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; 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charset=\"UTF-8\""},"content":"Document how driver binding works during a Live Update and what the PCI\ncore expects of drivers and users. Note that this is only a description\nof the current division of responsibilities. These can change in the\nfuture if we decide.\n\nSigned-off-by: David Matlack \n---\n drivers/pci/liveupdate.c | 16 ++++++++++++++++\n 1 file changed, 16 insertions(+)","diff":"diff --git a/drivers/pci/liveupdate.c b/drivers/pci/liveupdate.c\nindex e616cecc37c8..c0a30d16d9b8 100644\n--- a/drivers/pci/liveupdate.c\n+++ b/drivers/pci/liveupdate.c\n@@ -77,6 +77,22 @@\n * preserved. These may be relaxed in the future:\n *\n * * The device cannot be a Virtual Function (VF).\n+ *\n+ * Driver Binding\n+ * ==============\n+ *\n+ * In the outgoing kernel, it is the driver's responsibility to ensure that it\n+ * does not release a device between pci_liveupdate_preserve() and\n+ * pci_liveupdate_unpreserve().\n+ *\n+ * In the incoming kernel, it is the driver's responsibility to ensure that it\n+ * does not release a preserved device between probe() and\n+ * pci_liveupdate_finish().\n+ *\n+ * It is the user's responsibility to ensure that incoming preserved devices are\n+ * bound to the correct driver. i.e. The PCI core does not protect against a\n+ * device getting preserved by driver A in the outgoing kernel and then getting\n+ * bound to driver B in the incoming kernel.\n */\n \n #define pr_fmt(fmt) \"PCI: liveupdate: \" fmt\n","prefixes":["v4","04/11"]}