Re: [PATCH 1/30] ACPI / PCI: Make bus registration and unregistration symmetric

[Yinghai Lu]

On Wed, Jul 17, 2013 at 4:15 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> Since acpi_pci_slot_enumerate() and acpiphp_enumerate_slots() can get
> the ACPI device handle they need from bus->bridge, it is not
> necessary to pass that handle to them as an argument.
>
> Drop the second argument of acpi_pci_slot_enumerate() and
> acpiphp_enumerate_slots(), rework them to obtain the ACPI handle
> from bus->bridge and make acpi_pci_add_bus() and
> acpi_pci_remove_bus() entirely symmetrical.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> ---
>  drivers/acpi/pci_slot.c            |   14 +++++++++-----
>  drivers/pci/hotplug/acpiphp_glue.c |    6 ++++--
>  drivers/pci/pci-acpi.c             |   16 ++++------------
>  include/linux/pci-acpi.h           |   10 ++++------
>  4 files changed, 21 insertions(+), 25 deletions(-)
>
> Index: linux-pm/drivers/acpi/pci_slot.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/pci_slot.c
> +++ linux-pm/drivers/acpi/pci_slot.c
> @@ -159,12 +159,16 @@ register_slot(acpi_handle handle, u32 lv
>         return AE_OK;
>  }
>
> -void acpi_pci_slot_enumerate(struct pci_bus *bus, acpi_handle handle)
> +void acpi_pci_slot_enumerate(struct pci_bus *bus)
>  {
> -       mutex_lock(&slot_list_lock);
> -       acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
> -                           register_slot, NULL, bus, NULL);
> -       mutex_unlock(&slot_list_lock);
> +       acpi_handle handle = ACPI_HANDLE(bus->bridge);
> +
> +       if (handle) {
> +               mutex_lock(&slot_list_lock);
> +               acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
> +                                   register_slot, NULL, bus, NULL);
> +               mutex_unlock(&slot_list_lock);
> +       }
>  }
>
>  void acpi_pci_slot_remove(struct pci_bus *bus)
> Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c
> +++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c
> @@ -1147,14 +1147,16 @@ static void handle_hotplug_event_func(ac
>   * Create hotplug slots for the PCI bus.
>   * It should always return 0 to avoid skipping following notifiers.
>   */
> -void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle)
> +void acpiphp_enumerate_slots(struct pci_bus *bus)
>  {
> +       acpi_handle handle;
>         struct acpiphp_bridge *bridge;
>
>         if (acpiphp_disabled)
>                 return;
>
> -       if (detect_ejectable_slots(handle) <= 0)
> +       handle = ACPI_HANDLE(bus->bridge);
> +       if (!handle || detect_ejectable_slots(handle) <= 0)
>                 return;
>
>         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
> Index: linux-pm/drivers/pci/pci-acpi.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/pci-acpi.c
> +++ linux-pm/drivers/pci/pci-acpi.c
> @@ -290,24 +290,16 @@ static struct pci_platform_pm_ops acpi_p
>
>  void acpi_pci_add_bus(struct pci_bus *bus)
>  {
> -       acpi_handle handle = NULL;
> -
> -       if (bus->bridge)
> -               handle = ACPI_HANDLE(bus->bridge);
> -       if (acpi_pci_disabled || handle == NULL)
> +       if (acpi_pci_disabled || !bus->bridge)
>                 return;
>
> -       acpi_pci_slot_enumerate(bus, handle);
> -       acpiphp_enumerate_slots(bus, handle);
> +       acpi_pci_slot_enumerate(bus);
> +       acpiphp_enumerate_slots(bus);
>  }
>
>  void acpi_pci_remove_bus(struct pci_bus *bus)
>  {
> -       /*
> -        * bus->bridge->acpi_node.handle has already been reset to NULL
> -        * when acpi_pci_remove_bus() is called, so don't check ACPI handle.
> -        */
> -       if (acpi_pci_disabled)
> +       if (acpi_pci_disabled || !bus->bridge)
>                 return;

Acked-by: Yinghai Lu <yinghai@xxxxxxxxxx>

>
>         acpiphp_remove_slots(bus);
> Index: linux-pm/include/linux/pci-acpi.h
> ===================================================================
> --- linux-pm.orig/include/linux/pci-acpi.h
> +++ linux-pm/include/linux/pci-acpi.h
> @@ -47,24 +47,22 @@ void acpi_pci_remove_bus(struct pci_bus
>
>  #ifdef CONFIG_ACPI_PCI_SLOT
>  void acpi_pci_slot_init(void);
> -void acpi_pci_slot_enumerate(struct pci_bus *bus, acpi_handle handle);
> +void acpi_pci_slot_enumerate(struct pci_bus *bus);
>  void acpi_pci_slot_remove(struct pci_bus *bus);
>  #else
>  static inline void acpi_pci_slot_init(void) { }
> -static inline void acpi_pci_slot_enumerate(struct pci_bus *bus,
> -                                          acpi_handle handle) { }
> +static inline void acpi_pci_slot_enumerate(struct pci_bus *bus) { }
>  static inline void acpi_pci_slot_remove(struct pci_bus *bus) { }
>  #endif
>
>  #ifdef CONFIG_HOTPLUG_PCI_ACPI
>  void acpiphp_init(void);
> -void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle);
> +void acpiphp_enumerate_slots(struct pci_bus *bus);
>  void acpiphp_remove_slots(struct pci_bus *bus);
>  void acpiphp_check_host_bridge(acpi_handle handle);
>  #else
>  static inline void acpiphp_init(void) { }
> -static inline void acpiphp_enumerate_slots(struct pci_bus *bus,
> -                                          acpi_handle handle) { }
> +static inline void acpiphp_enumerate_slots(struct pci_bus *bus) { }
>  static inline void acpiphp_remove_slots(struct pci_bus *bus) { }
>  static inline void acpiphp_check_host_bridge(acpi_handle handle) { }
>  #endif
>
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