[PATCH 2/2] ACPI / glue: Drop .find_bridge() callback from struct acpi_bus_type

Rafael J. Wysocki
2013-02-28T21:46:56Z

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

After PCI and USB have stopped using the .find_bridge() callback in
struct acpi_bus_type, the only remaining user of it is SATA, but SATA
only pretends to be a user, because it points that callback to a stub
always returning -ENODEV.

For this reason, drop the SATA's dummy .find_bridge() callback and
remove .find_bridge(), which is not used any more, from struct
acpi_bus_type entirely.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/acpi/glue.c | 26 +-------------------------
drivers/ata/libata-acpi.c | 6 ------
include/acpi/acpi_bus.h | 3 ---
3 files changed, 1 insertion(+), 34 deletions(-)

Index: linux-pm/drivers/ata/libata-acpi.c
===================================================================
--- linux-pm.orig/drivers/ata/libata-acpi.c
+++ linux-pm/drivers/ata/libata-acpi.c
@@ -1144,14 +1144,8 @@ static int ata_acpi_find_device(struct d
return -ENODEV;
}

-static int ata_acpi_find_dummy(struct device *dev, acpi_handle *handle)
-{
- return -ENODEV;
-}
-
static struct acpi_bus_type ata_acpi_bus = {
.name = "ATA",
- .find_bridge = ata_acpi_find_dummy,
.find_device = ata_acpi_find_device,
};

Index: linux-pm/include/acpi/acpi_bus.h
===================================================================
--- linux-pm.orig/include/acpi/acpi_bus.h
+++ linux-pm/include/acpi/acpi_bus.h
@@ -439,10 +439,7 @@ struct acpi_bus_type {
struct list_head list;
const char *name;
bool (*match)(struct device *dev);
- /* For general devices under the bus */
int (*find_device) (struct device *, acpi_handle *);
- /* For bridges, such as PCI root bridge, IDE controller */
- int (*find_bridge) (struct device *, acpi_handle *);
void (*setup)(struct device *);
void (*cleanup)(struct device *);
};
Index: linux-pm/drivers/acpi/glue.c
===================================================================
--- linux-pm.orig/drivers/acpi/glue.c
+++ linux-pm/drivers/acpi/glue.c
@@ -78,22 +78,6 @@ static struct acpi_bus_type *acpi_get_bu
return ret;
}

-static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
-{
- struct acpi_bus_type *tmp;
- int ret = -ENODEV;
-
- down_read(&bus_type_sem);
- list_for_each_entry(tmp, &bus_type_list, list) {
- if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
- ret = 0;
- break;
- }
- }
- up_read(&bus_type_sem);
- return ret;
-}
-
static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used,
void *addr_p, void **ret_p)
{
@@ -262,15 +246,7 @@ static int acpi_platform_notify(struct d
int ret;

ret = acpi_bind_one(dev, NULL);
- if (ret) {
- if (!type) {
- ret = acpi_find_bridge_device(dev, &handle);
- if (!ret)
- ret = acpi_bind_one(dev, handle);
-
- goto out;
- }
-
+ if (ret && type) {
ret = type->find_device(dev, &handle);
if (ret) {
DBG("Unable to get handle for %s\n", dev_name(dev));