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Subject[PATCH 11/16] PCI slot: Remove useless release handler (Not for mainline!)
The release() handler of struct pci_slot never be called because
pci_hp_deregister() calls pci_slot_destroy() after setting
slot->release with NULL. So we don't need release() handler of struct
pci_slot. In addition, we don't need pci_slot_add_hotplug().

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>

---
drivers/pci/hotplug/pci_hotplug_core.c | 15 -----------
drivers/pci/slot.c | 44 ---------------------------------
include/linux/pci.h | 3 --
3 files changed, 1 insertion(+), 61 deletions(-)

Index: linux-2.6.25-rc6/drivers/pci/slot.c
===================================================================
--- linux-2.6.25-rc6.orig/drivers/pci/slot.c
+++ linux-2.6.25-rc6/drivers/pci/slot.c
@@ -67,9 +67,6 @@ static void pci_slot_release(struct kobj

list_del(&slot->list);

- if (slot->release)
- slot->release(slot);
-
remove_sysfs_files(slot);
kfree(slot);
}
@@ -79,47 +76,6 @@ static struct kobj_type pci_slot_ktype =
.release = &pci_slot_release,
};

-int pci_slot_add_hotplug(struct pci_bus *parent, int slot_nr,
- void (*release)(struct pci_slot *))
-{
- struct pci_slot *slot;
- int retval, found;
-
- retval = 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.
- */
- list_for_each_entry(slot, &parent->slots, list) {
- if (slot->number == slot_nr) {
- found = 1;
- break;
- }
- }
-
- if (!found) {
- pr_debug("%s: slot not found\n", __func__);
- retval = -EEXIST;
- goto out;
- }
-
- if (slot->release) {
- pr_debug("%s: already claimed\n", __func__);
- retval = -EBUSY;
- goto out;
- }
-
- pr_debug("%s: adding release function to %x:%d\n",
- __func__, parent->number, slot_nr);
- slot->release = release;
- out:
- up_write(&pci_bus_sem);
- return retval;
-}
-EXPORT_SYMBOL_GPL(pci_slot_add_hotplug);
-
struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
const char *name)
{
Index: linux-2.6.25-rc6/include/linux/pci.h
===================================================================
--- linux-2.6.25-rc6.orig/include/linux/pci.h
+++ linux-2.6.25-rc6/include/linux/pci.h
@@ -135,7 +135,6 @@ struct pci_slot {
struct hotplug_slot *hotplug; /* Hotplug info (migrate over time) */
unsigned char number; /* PCI_SLOT(pci_dev->devfn) */
struct kobject kobj;
- void (*release)(struct pci_slot *);
};

/*
@@ -494,8 +493,6 @@ struct pci_bus *pci_add_new_bus(struct p
int busnr);
struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
const char *name);
-int pci_slot_add_hotplug(struct pci_bus *parent, int slot_nr,
- void (*release)(struct pci_slot *));
int pci_destroy_slot(struct pci_slot *slot);
int pci_scan_slot(struct pci_bus *bus, int devfn);
struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn);
Index: linux-2.6.25-rc6/drivers/pci/hotplug/pci_hotplug_core.c
===================================================================
--- linux-2.6.25-rc6.orig/drivers/pci/hotplug/pci_hotplug_core.c
+++ linux-2.6.25-rc6/drivers/pci/hotplug/pci_hotplug_core.c
@@ -537,12 +537,6 @@ static struct hotplug_slot *get_slot_fro
return NULL;
}

-static void hotplug_release(struct pci_slot *slot)
-{
- struct hotplug_slot *hotplug = slot->hotplug;
- hotplug->release(hotplug);
-}
-
/**
* pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
* @slot: pointer to the &struct hotplug_slot to register
@@ -576,12 +570,6 @@ int pci_hp_register(struct hotplug_slot
if (IS_ERR(pci_slot))
return PTR_ERR(pci_slot);

- result = pci_slot_add_hotplug(bus, slot_nr, hotplug_release);
- if (result) {
- pci_destroy_slot(pci_slot);
- return result;
- }
-
slot->pci_slot = pci_slot;
pci_slot->hotplug = slot;

@@ -631,8 +619,7 @@ int pci_hp_deregister(struct hotplug_slo
fs_remove_slot(slot);
dbg("Removed slot %s from the list\n", hotplug->name);

- hotplug_release(slot);
- slot->release = NULL;
+ hotplug->release(hotplug);
pci_destroy_slot(slot);

return 0;



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