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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
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9
drivers/usb/core/usb-acpi.c
View file

@ -210,9 +210,14 @@ static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
return 0;
}
static bool usb_acpi_bus_match(struct device *dev)
{
return is_usb_device(dev) || is_usb_port(dev);
}
static struct acpi_bus_type usb_acpi_bus = {
.bus = &usb_bus_type,
.find_bridge = usb_acpi_find_device,
.name = "USB",
.match = usb_acpi_bus_match,
.find_device = usb_acpi_find_device,
};