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PCI: shpchp: Iterate over all devices in slot, not functions 0-7

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Iterate through devices in a slot by using the upstream bridge's
"bus->devices" list instead of assuming they are functions 0-7.  It's
possible there are several slots on the same pci_bus, so restrict it to
only devices matching this slot's device number.

ARI (which allows functions 0-255) is a PCIe-only feature, and this is
a PCI hotplug driver, so we shouldn't find anything other than functions
0-7, but it's better to iterate the same way as other hotplug drivers.

[bhelgaas: changelog, check PCI_SLOT, fix shpchp_unconfigure_device()]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yijing Wang 2013-01-15 11:12:22 +08:00 committed by Bjorn Helgaas
parent ab6380ef01
commit fcbed0bcb2
1 changed files with 16 additions and 20 deletions
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36
drivers/pci/hotplug/shpchp_pci.c
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@ -40,7 +40,7 @@ int __ref shpchp_configure_device(struct slot *p_slot)
struct controller *ctrl = p_slot->ctrl;
struct pci_dev *bridge = ctrl->pci_dev;
struct pci_bus *parent = bridge->subordinate;
int num, fn;
int num;
dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
if (dev) {
@ -57,24 +57,20 @@ int __ref shpchp_configure_device(struct slot *p_slot)
return -ENODEV;
}
for (fn = 0; fn < 8; fn++) {
dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
if (!dev)
list_for_each_entry(dev, &parent->devices, bus_list) {
if (PCI_SLOT(dev->devfn) != p_slot->device)
continue;
if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
pci_hp_add_bridge(dev);
pci_dev_put(dev);
}
pci_assign_unassigned_bridge_resources(bridge);
for (fn = 0; fn < 8; fn++) {
dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
if (!dev)
list_for_each_entry(dev, &parent->devices, bus_list) {
if (PCI_SLOT(dev->devfn) != p_slot->device)
continue;
pci_configure_slot(dev);
pci_dev_put(dev);
}
pci_bus_add_devices(parent);
@ -85,32 +81,32 @@ int __ref shpchp_configure_device(struct slot *p_slot)
int shpchp_unconfigure_device(struct slot *p_slot)
{
int rc = 0;
int j;
u8 bctl = 0;
struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
struct pci_dev *dev, *temp;
struct controller *ctrl = p_slot->ctrl;
ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
__func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
for (j = 0; j < 8 ; j++) {
struct pci_dev *temp = pci_get_slot(parent,
(p_slot->device << 3) | j);
if (!temp)
list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
if (PCI_SLOT(dev->devfn) != p_slot->device)
continue;
if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
pci_dev_get(dev);
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
if (bctl & PCI_BRIDGE_CTL_VGA) {
ctrl_err(ctrl,
"Cannot remove display device %s\n",
pci_name(temp));
pci_dev_put(temp);
pci_name(dev));
pci_dev_put(dev);
rc = -EINVAL;
break;
}
}
pci_stop_and_remove_bus_device(temp);
pci_dev_put(temp);
pci_stop_and_remove_bus_device(dev);
pci_dev_put(dev);
}
return rc;
}