Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262083AbVCRWIJ (ORCPT ); Fri, 18 Mar 2005 17:08:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262094AbVCRWII (ORCPT ); Fri, 18 Mar 2005 17:08:08 -0500 Received: from fmr24.intel.com ([143.183.121.16]:45719 "EHLO scsfmr004.sc.intel.com") by vger.kernel.org with ESMTP id S262083AbVCRWEv (ORCPT ); Fri, 18 Mar 2005 17:04:51 -0500 Date: Fri, 18 Mar 2005 14:04:37 -0800 From: Rajesh Shah To: gregkh@suse.de, tony.luck@intel.com, len.brown@intel.com Cc: linux-pci@atrey.karlin.mff.cuni.cz, linux-kernel@vger.kernel.org, pcihpd-discuss@lists.sourceforge.net, linux-ia64@vger.kernel.org, acpi-devel@lists.sourceforge.net Subject: [patch 04/12] Prevent duplicate bus numbers when scanning PCI bridge Message-ID: <20050318140437.D1145@unix-os.sc.intel.com> Reply-To: Rajesh Shah References: <20050318133856.A878@unix-os.sc.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <20050318133856.A878@unix-os.sc.intel.com>; from rajesh.shah@intel.com on Fri, Mar 18, 2005 at 01:38:57PM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2006 Lines: 53 When hot-plugging a root bridge, as we try to assign bus numbers we may find that the hotplugged hieratchy has more PCI to PCI bridges (i.e. bus requirements) than available. Make sure we don't step over an existing bus when that happens. Signed-off-by: Rajesh Shah --- linux-2.6.11-mm4-iohp-rshah1/drivers/pci/probe.c | 12 ++++++++++-- 1 files changed, 10 insertions(+), 2 deletions(-) diff -puN drivers/pci/probe.c~prevent_duplicate_busnr drivers/pci/probe.c --- linux-2.6.11-mm4-iohp/drivers/pci/probe.c~prevent_duplicate_busnr 2005-03-16 13:07:10.376304290 -0800 +++ linux-2.6.11-mm4-iohp-rshah1/drivers/pci/probe.c 2005-03-16 13:07:10.496421476 -0800 @@ -417,7 +417,7 @@ int __devinit pci_scan_bridge(struct pci { struct pci_bus *child; int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); - u32 buses; + u32 buses, i; u16 bctl; pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); @@ -476,6 +476,10 @@ int __devinit pci_scan_bridge(struct pci /* Clear errors */ pci_write_config_word(dev, PCI_STATUS, 0xffff); + /* Prevent assigning a bus number that already exists. + * This can happen when a bridge is hot-plugged */ + if (pci_find_bus(pci_domain_nr(bus), max+1)) + return max; child = pci_alloc_child_bus(bus, dev, ++max); buses = (buses & 0xff000000) | ((unsigned int)(child->primary) << 0) @@ -507,7 +511,11 @@ int __devinit pci_scan_bridge(struct pci * as cards with a PCI-to-PCI bridge can be * inserted later. */ - max += CARDBUS_RESERVE_BUSNR; + for (i=0; i