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Subject[RFC PATCH v2, part 2 03/18] PCI, hotplug: use hotplug-safe iterators to walk PCI buses
Date
Enhance PCI hotplug drivers to use hotplug-safe iterators to walk
PCI buses.

In other words, replace pci_find_bus(), pci_find_next_bus() and
pci_root_buses with pci_bus_exists(), pci_get_bus(), pci_get_next_bus()
and pci_get_next_root_bus() etc.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Masanari Iida <standby24x7@gmail.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: linux-pci@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
drivers/pci/hotplug-pci.c | 2 +-
drivers/pci/hotplug/ibmphp_core.c | 8 +++++---
drivers/pci/hotplug/ibmphp_ebda.c | 8 ++++++--
drivers/pci/hotplug/sgi_hotplug.c | 3 ++-
drivers/pci/hotplug/shpchp_sysfs.c | 2 +-
5 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/hotplug-pci.c b/drivers/pci/hotplug-pci.c
index 6258dc2..18533ed 100644
--- a/drivers/pci/hotplug-pci.c
+++ b/drivers/pci/hotplug-pci.c
@@ -11,7 +11,7 @@ int __ref pci_hp_add_bridge(struct pci_dev *dev)
int end = parent->busn_res.end;

for (busnr = start; busnr <= end; busnr++) {
- if (!pci_find_bus(pci_domain_nr(parent), busnr))
+ if (!pci_bus_exists(pci_domain_nr(parent), busnr))
break;
}
if (busnr-- > end) {
diff --git a/drivers/pci/hotplug/ibmphp_core.c b/drivers/pci/hotplug/ibmphp_core.c
index cbd72d8..fb47695 100644
--- a/drivers/pci/hotplug/ibmphp_core.c
+++ b/drivers/pci/hotplug/ibmphp_core.c
@@ -739,7 +739,7 @@ static u8 bus_structure_fixup(u8 busno)
struct pci_dev *dev;
u16 l;

- if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno)))
+ if (pci_bus_exists(0, busno) || !(ibmphp_find_same_bus_num(busno)))
return 1;

bus = kmalloc(sizeof(*bus), GFP_KERNEL);
@@ -787,7 +787,7 @@ static int ibm_configure_device(struct pci_func *func)
PCI_DEVFN(func->device, func->function));

if (func->dev == NULL) {
- struct pci_bus *bus = pci_find_bus(0, func->busno);
+ struct pci_bus *bus = pci_get_bus(0, func->busno);
if (!bus)
return 0;

@@ -795,6 +795,7 @@ static int ibm_configure_device(struct pci_func *func)
PCI_DEVFN(func->device, func->function));
if (num)
pci_bus_add_devices(bus);
+ pci_bus_put(bus);

func->dev = pci_get_bus_and_slot(func->busno,
PCI_DEVFN(func->device, func->function));
@@ -1315,13 +1316,14 @@ static int __init ibmphp_init(void)
goto exit;
}

- bus = pci_find_bus(0, 0);
+ bus = pci_get_bus(0, 0);
if (!bus) {
err("Can't find the root pci bus, can not continue\n");
rc = -ENODEV;
goto error;
}
memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
+ pci_bus_put(bus);

ibmphp_debug = debug;

diff --git a/drivers/pci/hotplug/ibmphp_ebda.c b/drivers/pci/hotplug/ibmphp_ebda.c
index 9df78bc..e17f271 100644
--- a/drivers/pci/hotplug/ibmphp_ebda.c
+++ b/drivers/pci/hotplug/ibmphp_ebda.c
@@ -978,9 +978,13 @@ static int __init ebda_rsrc_controller (void)
} /* each hpc */

list_for_each_entry(tmp_slot, &ibmphp_slot_head, ibm_slot_list) {
+ struct pci_bus *bus = pci_get_bus(0, tmp_slot->bus);
+
+ BUG_ON(!bus);
snprintf(name, SLOT_NAME_SIZE, "%s", create_file_name(tmp_slot));
- pci_hp_register(tmp_slot->hotplug_slot,
- pci_find_bus(0, tmp_slot->bus), tmp_slot->device, name);
+ pci_hp_register(tmp_slot->hotplug_slot, bus, tmp_slot->device,
+ name);
+ pci_bus_put(bus);
}

print_ebda_hpc ();
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index b2781df..5c69bda 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -684,7 +684,7 @@ static int __init sn_pci_hotplug_init(void)

INIT_LIST_HEAD(&sn_hp_list);

- while ((pci_bus = pci_find_next_bus(pci_bus))) {
+ for_each_pci_root_bus(pci_bus) {
if (!pci_bus->sysdata)
continue;

@@ -703,6 +703,7 @@ static int __init sn_pci_hotplug_init(void)
break;
}
}
+ pci_bus_put(pci_bus);

return registered == 1 ? 0 : -ENODEV;
}
diff --git a/drivers/pci/hotplug/shpchp_sysfs.c b/drivers/pci/hotplug/shpchp_sysfs.c
index e8c31fe..e7a5dd2 100644
--- a/drivers/pci/hotplug/shpchp_sysfs.c
+++ b/drivers/pci/hotplug/shpchp_sysfs.c
@@ -74,7 +74,7 @@ static ssize_t show_ctrl (struct device *dev, struct device_attribute *attr, cha
}
out += sprintf(out, "Free resources: bus numbers\n");
for (busnr = bus->busn_res.start; busnr <= bus->busn_res.end; busnr++) {
- if (!pci_find_bus(pci_domain_nr(bus), busnr))
+ if (!pci_bus_exists(pci_domain_nr(bus), busnr))
break;
}
if (busnr < bus->busn_res.end)
--
1.8.1.2


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