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ACPI: make acpi_bus_register_driver() return success/failure, not device count 

acpi_bus_register_driver() should not return the number of devices claimed.
We're not asking to find devices, we're making a driver available to devices,
including hot-pluggable devices that may appear in the future.

I audited all callers of acpi_bus_register_driver(), and except asus_acpi.c
and sonypi.c (fixed in previous patches), all either ignore the return value
or test only for failure (<0).

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2006-03-28 17:04:00 -05:00 committed by Len Brown
parent 683aa4012f
commit 9d9f749b31
1 changed files with 5 additions and 11 deletions
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16
drivers/acpi/scan.c
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@ -548,10 +548,9 @@ static int acpi_start_single_object(struct acpi_device *device)
return_VALUE(result);
}
static int acpi_driver_attach(struct acpi_driver *drv)
static void acpi_driver_attach(struct acpi_driver *drv)
{
struct list_head *node, *next;
int count = 0;
ACPI_FUNCTION_TRACE("acpi_driver_attach");
@ -568,7 +567,6 @@ static int acpi_driver_attach(struct acpi_driver *drv)
if (!acpi_bus_driver_init(dev, drv)) {
acpi_start_single_object(dev);
atomic_inc(&drv->references);
count++;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found driver [%s] for device [%s]\n",
drv->name, dev->pnp.bus_id));
@ -577,7 +575,6 @@ static int acpi_driver_attach(struct acpi_driver *drv)
spin_lock(&acpi_device_lock);
}
spin_unlock(&acpi_device_lock);
return_VALUE(count);
}
static int acpi_driver_detach(struct acpi_driver *drv)
@ -610,14 +607,11 @@ static int acpi_driver_detach(struct acpi_driver *drv)
* @driver: driver being registered
*
* Registers a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and binds. Returns the
* number of devices that were claimed by the driver, or a negative
* error status for failure.
* devices that match the driver's criteria and binds. Returns zero for
* success or a negative error status for failure.
*/
int acpi_bus_register_driver(struct acpi_driver *driver)
{
int count;
ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
if (acpi_disabled)
@ -629,9 +623,9 @@ int acpi_bus_register_driver(struct acpi_driver *driver)
spin_lock(&acpi_device_lock);
list_add_tail(&driver->node, &acpi_bus_drivers);
spin_unlock(&acpi_device_lock);
count = acpi_driver_attach(driver);
acpi_driver_attach(driver);
return_VALUE(count);
return_VALUE(0);
}
EXPORT_SYMBOL(acpi_bus_register_driver);