From fda8749ba73638f5bbca3ffb39bc6861eb3b23fa Mon Sep 17 00:00:00 2001 From: Ratheesh Kannoth Date: Tue, 14 Apr 2026 13:47:30 +0530 Subject: [PATCH] PCI: host-common: Request bus reassignment when not probe-only pci_host_common_init() is used by several generic ECAM host drivers. After PCI core changes around pci_flags and preserve_config, these hosts no longer opted into full bus number reassignment the way they did before, which broke enumeration of devices on a Marvell CN106XX board. When PCI_PROBE_ONLY is not set, add PCI_REASSIGN_ALL_BUS so pci_scan_bridge_extend() takes the reassignment path: bus numbers can be assigned from firmware EA data (e.g. pci_ea_fixed_busnrs()). Skip the flag in probe-only mode so existing assignments are not overridden. Fixes: 7246a4520b4b ("PCI: Use preserve_config in place of pci_flags") Closes: https://lore.kernel.org/all/abkqm_LCd9zAM8cW@rkannoth-OptiPlex-7090/ Signed-off-by: Ratheesh Kannoth [mani: added stable tag] Signed-off-by: Manivannan Sadhasivam [bhelgaas: add problem report link] Signed-off-by: Bjorn Helgaas Cc: stable@vger.kernel.org Cc: Vidya Sagar Link: https://patch.msgid.link/20260414081730.3864372-1-rkannoth@marvell.com --- drivers/pci/controller/pci-host-common.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c index d6258c1cffe5e..99952fb7189b1 100644 --- a/drivers/pci/controller/pci-host-common.c +++ b/drivers/pci/controller/pci-host-common.c @@ -68,6 +68,10 @@ int pci_host_common_init(struct platform_device *pdev, if (IS_ERR(cfg)) return PTR_ERR(cfg); + /* Do not reassign bus numbers if probe only */ + if (!pci_has_flag(PCI_PROBE_ONLY)) + pci_add_flags(PCI_REASSIGN_ALL_BUS); + bridge->sysdata = cfg; bridge->ops = (struct pci_ops *)&ops->pci_ops; bridge->enable_device = ops->enable_device; -- 2.47.3