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ACPI / glue: Add .match() callback to struct acpi_bus_type

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USB uses the .find_bridge() callback from struct acpi_bus_type
incorrectly, because as a result of the way it is used by USB every
device in the system that doesn't have a bus type or parent is
passed to usb_acpi_find_device() for inspection.

What USB actually needs, though, is to call usb_acpi_find_device()
for USB ports that don't have a bus type defined, but have
usb_port_device_type as their device type, as well as for USB
devices.

To fix that replace the struct bus_type pointer in struct
acpi_bus_type used for matching devices to specific subsystems
with a .match() callback to be used for this purpose and update
the users of struct acpi_bus_type, including USB, accordingly.
Define the .match() callback routine for USB, usb_acpi_bus_match(),
in such a way that it will cover both USB devices and USB ports
and remove the now redundant .find_bridge() callback pointer from
usb_acpi_bus.

Signed-off-by: Rafael J. Wysocki <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Yinghai Lu <[email protected]>
Acked-by: Jeff Garzik <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2013-03-03 22:35:20 +01:00
commit 53540098b2
7 changed files with 43 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

39
drivers/acpi/glue.c
View file

@ -36,12 +36,11 @@ int register_acpi_bus_type(struct acpi_bus_type *type)
{
if (acpi_disabled)
return -ENODEV;
if (type && type->bus && type->find_device) {
if (type && type->match && type->find_device) {
down_write(&bus_type_sem);
list_add_tail(&type->list, &bus_type_list);
up_write(&bus_type_sem);
printk(KERN_INFO PREFIX "bus type %s registered\n",
type->bus->name);
printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
return 0;
}
return -ENODEV;
@ -56,24 +55,21 @@ int unregister_acpi_bus_type(struct acpi_bus_type *type)
down_write(&bus_type_sem);
list_del_init(&type->list);
up_write(&bus_type_sem);
printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
type->bus->name);
printk(KERN_INFO PREFIX "bus type %s unregistered\n",
type->name);
return 0;
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
{
struct acpi_bus_type *tmp, *ret = NULL;
if (!type)
return NULL;
down_read(&bus_type_sem);
list_for_each_entry(tmp, &bus_type_list, list) {
if (tmp->bus == type) {
if (tmp->match(dev)) {
ret = tmp;
break;
}
@ -261,26 +257,17 @@ err:
static int acpi_platform_notify(struct device *dev)
{
struct acpi_bus_type *type;
struct acpi_bus_type *type = acpi_get_bus_type(dev);
acpi_handle handle;
int ret;
ret = acpi_bind_one(dev, NULL);
if (ret && (!dev->bus || !dev->parent)) {
/* bridge devices genernally haven't bus or parent */
ret = acpi_find_bridge_device(dev, &handle);
if (!ret) {
ret = acpi_bind_one(dev, handle);
if (ret)
goto out;
}
}
type = acpi_get_bus_type(dev->bus);
if (ret) {
if (!type || !type->find_device) {
DBG("No ACPI bus support for %s\n", dev_name(dev));
ret = -EINVAL;
if (!type) {
ret = acpi_find_bridge_device(dev, &handle);
if (!ret)
ret = acpi_bind_one(dev, handle);
goto out;
}
@ -316,7 +303,7 @@ static int acpi_platform_notify_remove(struct device *dev)
{
struct acpi_bus_type *type;
type = acpi_get_bus_type(dev->bus);
type = acpi_get_bus_type(dev);
if (type && type->cleanup)
type->cleanup(dev);