From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: [RFC][PATCH 1/8] ACPI / PCI: Make bus registration and unregistration symmetric Date: Tue, 09 Jul 2013 02:14:38 +0200 Message-ID: <29876102.Oh151SK5OE@vostro.rjw.lan> References: <26431283.HJCKsss0rt@vostro.rjw.lan> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <26431283.HJCKsss0rt@vostro.rjw.lan> Sender: linux-kernel-owner@vger.kernel.org To: ACPI Devel Maling List Cc: Bjorn Helgaas , LKML , Linux PCI , Yinghai Lu , Jiang Liu , Mika Westerberg List-Id: linux-acpi@vger.kernel.org From: Rafael J. Wysocki 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 --- drivers/acpi/pci_slot.c | 14 +++++++++----- drivers/pci/hotplug/acpiphp_glue.c | 7 ++++--- drivers/pci/pci-acpi.c | 16 ++++------------ include/linux/pci-acpi.h | 10 ++++------ 4 files changed, 21 insertions(+), 26 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 @@ -1169,15 +1169,16 @@ 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 dummy_handle; + acpi_handle handle, dummy_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; 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