| Message ID | 1346168638-32724-4-git-send-email-jiang.liu@huawei.com |
|---|---|
| State | Accepted |
| Headers | show |
diff --git a/drivers/pci/hotplug/cpcihp_generic.c b/drivers/pci/hotplug/cpcihp_generic.c index 81af764..a6a71c4 100644 --- a/drivers/pci/hotplug/cpcihp_generic.c +++ b/drivers/pci/hotplug/cpcihp_generic.c @@ -154,12 +154,8 @@ static int __init cpcihp_generic_init(void) if(!r) return -EBUSY; - bus = pci_find_bus(0, bridge_busnr); - if (!bus) { - err("Invalid bus number %d", bridge_busnr); - return -EINVAL; - } - dev = pci_get_slot(bus, PCI_DEVFN(bridge_slot, 0)); + dev = pci_get_domain_bus_and_slot(0, bridge_busnr, + PCI_DEVFN(bridge_slot, 0)); if(!dev || dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { err("Invalid bridge device %s", bridge); pci_dev_put(dev);
Following code has a race window between pci_find_bus() and pci_get_slot() if PCI hotplug operation happens between them which removes the pci_bus. So use PCI hotplug safe interface pci_get_domain_bus_and_slot() instead, which also reduces code complexity. struct pci_bus *pci_bus = pci_find_bus(domain, busno); struct pci_dev *pci_dev = pci_get_slot(pci_bus, devfn); Signed-off-by: Jiang Liu <jiang.liu@huawei.com> --- drivers/pci/hotplug/cpcihp_generic.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)