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Date: Sun, 09 Jun 2013 00:28:02 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc: Aaron Lu <aaron.lu@...el.com>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] ACPI / scan: Simplify ACPI driver probing
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
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, so that check has
to be moved to acpi_device_probe() anyway.
For these reasons, drop acpi_bus_driver_init() altogether and move
the code from it directly into acpi_device_probe().
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
Should apply on top of the bleeding-edge branch of the linux-pm.git tree.
Thanks,
Rafael
---
drivers/acpi/scan.c | 88 +++++++++++++++++++---------------------------------
1 file changed, 33 insertions(+), 55 deletions(-)
Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -933,32 +933,45 @@ static void acpi_device_remove_notify_ha
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);
+ struct acpi_device *acpi_dev;
+ struct acpi_driver *acpi_drv;
int ret;
- ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
- if (!ret) {
- 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;
- }
- }
+ if (!dev || !dev->driver)
+ return -EINVAL;
+
+ acpi_dev = to_acpi_device(dev);
+ acpi_drv = to_acpi_driver(dev->driver);
+ 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));
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Found driver [%s] for device [%s]\n",
- acpi_drv->name, acpi_dev->pnp.bus_id));
- get_device(dev);
+ 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;
+ }
}
- return ret;
+
+ 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 0;
}
static int acpi_device_remove(struct device * dev)
@@ -1114,41 +1127,6 @@ static void acpi_device_unregister(struc
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
*
--
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