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Subject[PATCH 5/5] Add pci_slot_add_hotplug() interface

Change the semantics of pci_create_slot() such that it does not
require a hotplug release() method when creating a slot. Now, we
can use this interface to create a pci_slot for any physical PCI
slots, not just hotpluggable ones.

Add new pci_slot_add_hotplug() interface so that various PCI hotplug
drivers can add hotplug release() methods to pre-existing physical
slots.

Signed-off-by: Alex Chiang <achiang@hp.com>
---
drivers/pci/hotplug/pci_hotplug_core.c | 2 +-
drivers/pci/slot.c | 39 +++++++++++++++++++++++++++-----
include/linux/pci.h | 4 ++-
3 files changed, 37 insertions(+), 8 deletions(-)
diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index 96c21e2..91afa8e 100644
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -568,7 +568,7 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr)
return -EINVAL;
}

- pci_slot = pci_create_slot(bus, slot_nr, slot->name, hotplug_release);
+ pci_slot = pci_slot_add_hotplug(bus, slot_nr, hotplug_release);
if (IS_ERR(pci_slot))
return PTR_ERR(pci_slot);
slot->pci_slot = pci_slot;
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index 5d830d4..3e91491 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -70,20 +70,48 @@ static int create_sysfs_files(struct pci_slot *slot)
return result;
}

+struct pci_slot *pci_slot_add_hotplug(struct pci_bus *parent, int slot_nr,
+ void (*release)(struct pci_slot *))
+{
+ struct pci_slot *slot;
+ int found = 0;
+
+ down_write(&pci_bus_sem);
+
+ /* This slot should have already been created, so look for it. If
+ * we can't find it, return -EEXIST.
+ */
+ for (slot = parent->slot; slot; slot = slot->next)
+ if (slot->number == slot_nr) {
+ found = 1;
+ break;
+ }
+
+ if (!found) {
+ slot = ERR_PTR(-EEXIST);
+ goto out;
+ }
+
+ slot->release = release;
+ out:
+ up_write(&pci_bus_sem);
+ return slot;
+}
+EXPORT_SYMBOL_GPL(pci_slot_add_hotplug);
+
struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
- const char *name, void (*release)(struct pci_slot *))
+ const char *name)
{
struct pci_slot *slot;
int err;

down_write(&pci_bus_sem);

- /* If we've already created this slot, return -EEXIST. The same slot
- * may be described twice (eg, by ACPI and PCIe) */
+ /* If we've already created this slot, just return. */
for (slot = parent->slot; slot; slot = slot->next) {
- if (slot->number != slot_nr)
+ if (slot->number != slot_nr) {
continue;
- slot = ERR_PTR(-EEXIST);
+ }
goto out;
}

@@ -95,7 +123,6 @@ struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,

slot->bus = parent;
slot->number = slot_nr;
- slot->release = release;

kobject_set_name(&slot->kobj, "%s", name);
kobj_set_kset_s(slot, pci_slots_subsys);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index a075667..62116a5 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -483,7 +483,9 @@ static inline struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *s
struct pci_bus *pci_create_bus(struct device *parent, int bus, struct pci_ops *ops, void *sysdata);
struct pci_bus * pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr);
struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
- const char *name, void (*release)(struct pci_slot *));
+ const char *name);
+struct pci_slot *pci_slot_add_hotplug(struct pci_bus *parent, int slot_nr,
+ void (*release)(struct pci_slot *));
int pci_scan_slot(struct pci_bus *bus, int devfn);
struct pci_dev * pci_scan_single_device(struct pci_bus *bus, int devfn);
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus);
--
1.5.3.1.1.g1e61
-
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