From b87e81e5c6e64ae0eae3b4f61bf07bfeec856184 Mon Sep 17 00:00:00 2001 From: "yakui.zhao@intel.com" Date: Tue, 15 Apr 2008 14:34:49 -0700 Subject: [PATCH] acpi: unneccessary to scan the PCI bus already scanned http://bugzilla.kernel.org/show_bug.cgi?id=10124 this change: commit 08f1c192c3c32797068bfe97738babb3295bbf42 Author: Muli Ben-Yehuda Date: Sun Jul 22 00:23:39 2007 +0300 x86-64: introduce struct pci_sysdata to facilitate sharing of ->sysdata This patch introduces struct pci_sysdata to x86 and x86-64, and converts the existing two users (NUMA, Calgary) to use it. This lays the groundwork for having other users of sysdata, such as the PCI domains work. The Calgary bits are tested, the NUMA bits just look ok. replaces pcibios_scan_root by pci_scan_bus_parented... but in pcibios_scan_root we have a check about scanned busses. Cc: Cc: Stian Jordet Cc: Len Brown Cc: Greg KH Cc: Ingo Molnar Cc: "Yinghai Lu" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/ia64/pci/pci.c | 7 ++++++- arch/x86/pci/acpi.c | 17 +++++++++++++++-- 2 files changed, 21 insertions(+), 3 deletions(-) diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c index e282c348dcde..53d0a8ee35d7 100644 --- a/arch/ia64/pci/pci.c +++ b/arch/ia64/pci/pci.c @@ -362,7 +362,12 @@ pci_acpi_scan_root(struct acpi_device *device, int domain, int bus) info.name = name; acpi_walk_resources(device->handle, METHOD_NAME__CRS, add_window, &info); - + /* + * See arch/x86/pci/acpi.c. + * The desired pci bus might already be scanned in a quirk. We + * should handle the case here, but it appears that IA64 hasn't + * such quirk. So we just ignore the case now. + */ pbus = pci_scan_bus_parented(NULL, bus, &pci_root_ops, controller); if (pbus) pcibios_setup_root_windows(pbus, controller); diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index 0234f2831bf3..378136fb5044 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -219,8 +219,21 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do if (pxm >= 0) sd->node = pxm_to_node(pxm); #endif + /* + * Maybe the desired pci bus has been already scanned. In such case + * it is unnecessary to scan the pci bus with the given domain,busnum. + */ + bus = pci_find_bus(domain, busnum); + if (bus) { + /* + * If the desired bus exits, the content of bus->sysdata will + * be replaced by sd. + */ + memcpy(bus->sysdata, sd, sizeof(*sd)); + kfree(sd); + } else + bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd); - bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd); if (!bus) kfree(sd); @@ -228,7 +241,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do if (bus != NULL) { if (pxm >= 0) { printk("bus %d -> pxm %d -> node %d\n", - busnum, pxm, sd->node); + busnum, pxm, pxm_to_node(pxm)); } } #endif -- 2.30.2