Introduce pci_host_bridge_list to manage pci host bridges in system, so we could detect whether the host in domain:bus is alreay registered. Then we could remove bus alreay exist test in __pci_create_root_bus(). Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx> Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> --- drivers/pci/host-bridge.c | 24 +++++++++++++++++++++++- drivers/pci/probe.c | 8 +------- include/linux/pci.h | 1 + 3 files changed, 25 insertions(+), 8 deletions(-) diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c index 3bd45e7..0bb08ef 100644 --- a/drivers/pci/host-bridge.c +++ b/drivers/pci/host-bridge.c @@ -8,6 +8,9 @@ #include "pci.h" +static LIST_HEAD(pci_host_bridge_list); +static DEFINE_MUTEX(phb_mutex); + static void pci_release_host_bridge_dev(struct device *dev) { struct pci_host_bridge *bridge = to_pci_host_bridge(dev); @@ -25,7 +28,7 @@ struct pci_host_bridge *pci_create_host_bridge( int error; int bus = PCI_BUSNUM(db); int domain = PCI_DOMAIN(db); - struct pci_host_bridge *host; + struct pci_host_bridge *host, *temp; struct resource_entry *window, *n; host = kzalloc(sizeof(*host), GFP_KERNEL); @@ -40,6 +43,18 @@ struct pci_host_bridge *pci_create_host_bridge( */ pci_host_assign_domain_nr(host); + mutex_lock(&phb_mutex); + list_for_each_entry(temp, &pci_host_bridge_list, list) + if (temp->domain == host->domain + && temp->busnum == host->busnum) { + dev_dbg(&host->dev, "pci host bridge pci%04x:%02x exist\n", + host->domain, host->busnum); + mutex_unlock(&phb_mutex); + kfree(host); + return NULL; + } + mutex_unlock(&phb_mutex); + host->dev.parent = parent; INIT_LIST_HEAD(&host->windows); host->dev.release = pci_release_host_bridge_dev; @@ -55,11 +70,18 @@ struct pci_host_bridge *pci_create_host_bridge( resource_list_for_each_entry_safe(window, n, resources) list_move_tail(&window->node, &host->windows); + mutex_lock(&phb_mutex); + list_add_tail(&host->list, &pci_host_bridge_list); + mutex_unlock(&phb_mutex); return host; } void pci_free_host_bridge(struct pci_host_bridge *host) { + mutex_lock(&phb_mutex); + list_del(&host->list); + mutex_unlock(&phb_mutex); + device_unregister(&host->dev); } diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 751fec3..fdb808c 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1869,7 +1869,7 @@ static struct pci_bus *__pci_create_root_bus( void *sysdata) { int error; - struct pci_bus *b, *b2; + struct pci_bus *b; struct resource_entry *window; struct device *parent; struct resource *res; @@ -1886,12 +1886,6 @@ static struct pci_bus *__pci_create_root_bus( b->ops = ops; b->number = b->busn_res.start = bridge->busnum; pci_bus_assign_domain_nr(b, parent); - b2 = pci_find_bus(pci_domain_nr(b), b->number); - if (b2) { - /* If we already got to this bus through a different bridge, ignore it */ - dev_dbg(&b2->dev, "bus already known\n"); - goto err_out; - } bridge->bus = b; b->bridge = get_device(&bridge->dev); diff --git a/include/linux/pci.h b/include/linux/pci.h index 463eaa3..b621f5b 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -406,6 +406,7 @@ struct pci_host_bridge { struct device dev; struct pci_bus *bus; /* root bus */ struct list_head windows; /* resource_entry */ + struct list_head list; void (*release_fn)(struct pci_host_bridge *); void *release_data; }; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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