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SubjectRe: [PATCH 11/16] PCI slot: Remove useless release handler (Not for mainline!)
* Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>:
> 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().

Thanks, this was a good change. I've tested and merged it.

I did make two small changes though:

>
> 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);

This prevents multiple hotplug drivers from claiming the same
slot.

+ if (pci_slot->hotplug) {
+ dbg("%s: already claimed\n", __func__);
+ pci_destroy_slot(pci_slot);
+ return -EBUSY;

>
> - 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);

+ slot->hotplug = NULL;

The above is needed if pci_slot is loaded, and you wish to
repeatedly load/unload acpiphp/pciehp/other hp drivers.

Thanks,

/ac

> pci_destroy_slot(slot);
>
> return 0;
>
>


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