Commit d9e455f5 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI / scan: Simplify ACPI driver probing 



There is no particular reason why acpi_bus_driver_init() needs to be
a separate function and its location with respect to its only caller,
acpi_device_probe(), makes the code a bit difficult to follow.

Besides, it doesn't really make sense to check if 'device' is not
NULL in acpi_bus_driver_init(), because we've already dereferenced
dev->driver in acpi_device_probe() at that point and, moreover,
'device' cannot be NULL then, because acpi_device_probe() is called
via really_probe() (which also sets dev->driver for that matter).

For these reasons, drop acpi_bus_driver_init() altogether and move
the remaining code from it directly into acpi_device_probe().

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 7d132055

drivers/acpi/scan.c

+27 −54
Original line number Diff line number Diff line
@@ -816,32 +816,40 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device) 
					   acpi_device_notify);

}



static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);

static int acpi_device_probe(struct device *dev)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);

	int ret;



	ret = acpi_bus_driver_init(acpi_dev, acpi_drv);

	if (!ret) {

	if (!acpi_drv->ops.add)

		return -ENOSYS;



	ret = acpi_drv->ops.add(acpi_dev);

	if (ret)

		return ret;



	acpi_dev->driver = acpi_drv;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,

			  "Driver [%s] successfully bound to device [%s]\n",

			  acpi_drv->name, acpi_dev->pnp.bus_id));



	if (acpi_drv->ops.notify) {

		ret = acpi_device_install_notify_handler(acpi_dev);

		if (ret) {

			if (acpi_drv->ops.remove)

				acpi_drv->ops.remove(acpi_dev);



			acpi_dev->driver = NULL;

			acpi_dev->driver_data = NULL;

			return ret;

		}

	}



		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

			"Found driver [%s] for device [%s]\n",

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",

			  acpi_drv->name, acpi_dev->pnp.bus_id));

	get_device(dev);

	}

	return ret;

	return 0;

}



static int acpi_device_remove(struct device * dev)
@@ -997,41 +1005,6 @@ static void acpi_device_unregister(struct acpi_device *device) 
/* --------------------------------------------------------------------------

                                 Driver Management

   -------------------------------------------------------------------------- */

/**

 * acpi_bus_driver_init - add a device to a driver

 * @device: the device to add and initialize

 * @driver: driver for the device

 *

 * Used to initialize a device via its device driver.  Called whenever a

 * driver is bound to a device.  Invokes the driver's add() ops.

 */

static int

acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)

{

	int result = 0;



	if (!device || !driver)

		return -EINVAL;



	if (!driver->ops.add)

		return -ENOSYS;



	result = driver->ops.add(device);

	if (result)

		return result;



	device->driver = driver;



	/*

	 * TBD - Configuration Management: Assign resources to device based

	 * upon possible configuration and currently allocated resources.

	 */



	ACPI_DEBUG_PRINT((ACPI_DB_INFO,

			  "Driver successfully bound to device\n"));

	return 0;

}



/**

 * acpi_bus_register_driver - register a driver with the ACPI bus

 * @driver: driver being registered

CRA Git | Maintained and supported by SUSTech CRA and CCSE