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Date: Fri, 21 Mar 2008 12:40:37 -0600
From: Alex Chiang <achiang@...com>
To: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc: Greg KH <gregkh@...e.de>, Gary Hade <garyhade@...ibm.com>,
Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
Matthew Wilcox <matthew@....cx>, warthog19@...lescrag.net,
rick.jones2@...com, linux-kernel@...r.kernel.org,
linux-pci@...ey.karlin.mff.cuni.cz, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 5/16] PCI slot: Use list_head for pci slot list (Not
for mainline!)
* Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>:
> To make code simple, we should use list_head for physical slot list on
> the bus.
Merged, thanks.
/ac
>
> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
>
> ---
> drivers/acpi/pci_slot.c | 9 ++++++---
> drivers/pci/probe.c | 1 +
> drivers/pci/slot.c | 17 ++++++-----------
> include/linux/pci.h | 4 ++--
> 4 files changed, 15 insertions(+), 16 deletions(-)
>
> Index: linux-2.6.25-rc6/drivers/pci/probe.c
> ===================================================================
> --- linux-2.6.25-rc6.orig/drivers/pci/probe.c
> +++ linux-2.6.25-rc6/drivers/pci/probe.c
> @@ -384,6 +384,7 @@ static struct pci_bus * pci_alloc_bus(vo
> INIT_LIST_HEAD(&b->node);
> INIT_LIST_HEAD(&b->children);
> INIT_LIST_HEAD(&b->devices);
> + INIT_LIST_HEAD(&b->slots);
> }
> return b;
> }
> 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
> @@ -69,18 +69,12 @@ static int create_sysfs_files(struct pci
>
> static void pci_slot_release(struct kobject *kobj)
> {
> - struct pci_slot **pprev;
> struct pci_slot *slot = to_pci_slot(kobj);
>
> dbg("%s: releasing pci_slot on %x:%d\n", __func__,
> slot->bus->number, slot->number);
>
> - for (pprev = &slot->bus->slot; *pprev; pprev = &(*pprev)->next) {
> - if (*pprev == slot) {
> - *pprev = slot->next;
> - break;
> - }
> - }
> + list_del(&slot->list);
>
> if (slot->release)
> slot->release(slot);
> @@ -107,11 +101,12 @@ int pci_slot_add_hotplug(struct pci_bus
> /* 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)
> + list_for_each_entry(slot, &parent->slots, list) {
> if (slot->number == slot_nr) {
> found = 1;
> break;
> }
> + }
>
> if (!found) {
> dbg("%s: slot not found\n", __func__);
> @@ -143,7 +138,7 @@ struct pci_slot *pci_create_slot(struct
> down_write(&pci_bus_sem);
>
> /* If we've already created this slot, bump refcount and return. */
> - for (slot = parent->slot; slot; slot = slot->next) {
> + list_for_each_entry(slot, &parent->slots, list) {
> if (slot->number == slot_nr) {
> kobject_get(&slot->kobj);
> dbg("%s: bumped refcount to %d on %x:%d\n",
> @@ -175,8 +170,8 @@ struct pci_slot *pci_create_slot(struct
> if (err)
> goto unregister;
>
> - slot->next = parent->slot;
> - parent->slot = slot;
> + INIT_LIST_HEAD(&slot->list);
> + list_add(&slot->list, &parent->slots);
>
> dbg("%s: created pci_slot on %x:%d\n",
> __func__, parent->number, slot_nr);
> 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
> @@ -131,7 +131,7 @@ struct pci_cap_saved_state {
> /* pci_slot represents a physical slot */
> struct pci_slot {
> struct pci_bus *bus; /* The bus this slot is on */
> - struct pci_slot *next; /* Next slot on this bus */
> + struct list_head list; /* node in list of slots on this bus */
> struct hotplug_slot *hotplug; /* Hotplug info (migrate over time) */
> unsigned char number; /* PCI_SLOT(pci_dev->devfn) */
> struct kobject kobj;
> @@ -269,7 +269,7 @@ struct pci_bus {
> struct list_head children; /* list of child buses */
> struct list_head devices; /* list of devices on this bus */
> struct pci_dev *self; /* bridge device as seen by parent */
> - struct pci_slot *slot; /* First physical slot on this bus */
> + struct list_head slots; /* list of slots on this bus */
> struct resource *resource[PCI_BUS_NUM_RESOURCES];
> /* address space routed to this bus */
>
> Index: linux-2.6.25-rc6/drivers/acpi/pci_slot.c
> ===================================================================
> --- linux-2.6.25-rc6.orig/drivers/acpi/pci_slot.c
> +++ linux-2.6.25-rc6/drivers/acpi/pci_slot.c
> @@ -117,15 +117,18 @@ unregister_slot(acpi_handle handle, u32
> {
> int device;
> unsigned long sun;
> - struct pci_slot *slot;
> + struct pci_slot *slot, *tmp;
> struct pci_bus *pci_bus = context;
>
> if (check_slot(handle, &device, &sun))
> return AE_OK;
>
> - for (slot = pci_bus->slot; slot; slot = slot->next) {
> - if (slot->number == device)
> + /* FIXME - Need pci_bus_sem to be held */
> + list_for_each_entry_safe(slot, tmp, &pci_bus->slots, list) {
> + if (slot->number == device) {
> pci_destroy_slot(slot);
> + break;
> + }
> }
>
> return AE_OK;
>
>
--
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