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PCI/ACPI: Pass acpi_pci_root to acpi_pci_drivers' add/remove interface
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This patch changes .add/.remove interfaces of acpi_pci_driver.
In the current implementation acpi_handle is passed as a parameter
of .add/.remove interface.  However, the acpi_pci_root structure
contains more useful information than just the acpi_handle.  This
enables us to avoid some useless lookups in each acpi_pci_driver.

Note: This changes interfaces used by acpi_pci_register_driver(), an
exported symbol.  This patch updates all the in-kernel users, but any
out-of-kernel acpi_pci_register_driver() users will need updates.

[bhelgaas: changelog]
Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Taku Izumi authored and Bjorn Helgaas committed Sep 24, 2012
1 parent d0020f6 commit 55bfe3c
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Showing 4 changed files with 19 additions and 16 deletions.
8 changes: 4 additions & 4 deletions drivers/acpi/pci_root.c
Original file line number Diff line number Diff line change
Expand Up @@ -87,7 +87,7 @@ int acpi_pci_register_driver(struct acpi_pci_driver *driver)
list_add_tail(&driver->node, &acpi_pci_drivers);
if (driver->add)
list_for_each_entry(root, &acpi_pci_roots, node) {
driver->add(root->device->handle);
driver->add(root);
n++;
}
mutex_unlock(&acpi_pci_root_lock);
Expand All @@ -104,7 +104,7 @@ void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
list_del(&driver->node);
if (driver->remove)
list_for_each_entry(root, &acpi_pci_roots, node)
driver->remove(root->device->handle);
driver->remove(root);
mutex_unlock(&acpi_pci_root_lock);
}
EXPORT_SYMBOL(acpi_pci_unregister_driver);
Expand Down Expand Up @@ -629,7 +629,7 @@ static int acpi_pci_root_start(struct acpi_device *device)
mutex_lock(&acpi_pci_root_lock);
list_for_each_entry(driver, &acpi_pci_drivers, node)
if (driver->add)
driver->add(device->handle);
driver->add(root);
mutex_unlock(&acpi_pci_root_lock);

pci_bus_add_devices(root->bus);
Expand All @@ -645,7 +645,7 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
mutex_lock(&acpi_pci_root_lock);
list_for_each_entry(driver, &acpi_pci_drivers, node)
if (driver->remove)
driver->remove(root->device->handle);
driver->remove(root);
mutex_unlock(&acpi_pci_root_lock);

device_set_run_wake(root->bus->bridge, false);
Expand Down
11 changes: 6 additions & 5 deletions drivers/acpi/pci_slot.c
Original file line number Diff line number Diff line change
Expand Up @@ -67,8 +67,8 @@ struct acpi_pci_slot {
struct list_head list; /* node in the list of slots */
};

static int acpi_pci_slot_add(acpi_handle handle);
static void acpi_pci_slot_remove(acpi_handle handle);
static int acpi_pci_slot_add(struct acpi_pci_root *root);
static void acpi_pci_slot_remove(struct acpi_pci_root *root);

static LIST_HEAD(slot_list);
static DEFINE_MUTEX(slot_list_lock);
Expand Down Expand Up @@ -295,11 +295,11 @@ walk_root_bridge(acpi_handle handle, acpi_walk_callback user_function)
* @handle: points to an acpi_pci_root
*/
static int
acpi_pci_slot_add(acpi_handle handle)
acpi_pci_slot_add(struct acpi_pci_root *root)
{
acpi_status status;

status = walk_root_bridge(handle, register_slot);
status = walk_root_bridge(root->device->handle, register_slot);
if (ACPI_FAILURE(status))
err("%s: register_slot failure - %d\n", __func__, status);

Expand All @@ -311,10 +311,11 @@ acpi_pci_slot_add(acpi_handle handle)
* @handle: points to an acpi_pci_root
*/
static void
acpi_pci_slot_remove(acpi_handle handle)
acpi_pci_slot_remove(struct acpi_pci_root *root)
{
struct acpi_pci_slot *slot, *tmp;
struct pci_bus *pbus;
acpi_handle handle = root->device->handle;

mutex_lock(&slot_list_lock);
list_for_each_entry_safe(slot, tmp, &slot_list, list) {
Expand Down
12 changes: 7 additions & 5 deletions drivers/pci/hotplug/acpiphp_glue.c
Original file line number Diff line number Diff line change
Expand Up @@ -382,10 +382,10 @@ static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)


/* allocate and initialize host bridge data structure */
static void add_host_bridge(acpi_handle *handle)
static void add_host_bridge(struct acpi_pci_root *root)
{
struct acpiphp_bridge *bridge;
struct acpi_pci_root *root = acpi_pci_find_root(handle);
acpi_handle handle = root->device->handle;

bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
if (bridge == NULL)
Expand Down Expand Up @@ -468,11 +468,12 @@ find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)


/* find hot-pluggable slots, and then find P2P bridge */
static int add_bridge(acpi_handle handle)
static int add_bridge(struct acpi_pci_root *root)
{
acpi_status status;
unsigned long long tmp;
acpi_handle dummy_handle;
acpi_handle handle = root->device->handle;

/* if the bridge doesn't have _STA, we assume it is always there */
status = acpi_get_handle(handle, "_STA", &dummy_handle);
Expand All @@ -490,7 +491,7 @@ static int add_bridge(acpi_handle handle)
/* check if this bridge has ejectable slots */
if (detect_ejectable_slots(handle) > 0) {
dbg("found PCI host-bus bridge with hot-pluggable slots\n");
add_host_bridge(handle);
add_host_bridge(root);
}

/* search P2P bridges under this host bridge */
Expand Down Expand Up @@ -588,9 +589,10 @@ cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
return AE_OK;
}

static void remove_bridge(acpi_handle handle)
static void remove_bridge(struct acpi_pci_root *root)
{
struct acpiphp_bridge *bridge;
acpi_handle handle = root->device->handle;

/* cleanup p2p bridges under this host bridge
in a depth-first manner */
Expand Down
4 changes: 2 additions & 2 deletions include/linux/acpi.h
Original file line number Diff line number Diff line change
Expand Up @@ -139,8 +139,8 @@ void acpi_pci_irq_disable (struct pci_dev *dev);

struct acpi_pci_driver {
struct list_head node;
int (*add)(acpi_handle handle);
void (*remove)(acpi_handle handle);
int (*add)(struct acpi_pci_root *root);
void (*remove)(struct acpi_pci_root *root);
};

int acpi_pci_register_driver(struct acpi_pci_driver *driver);
Expand Down

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