On Fri, Jan 06, 2006 at 05:29:29PM +0100, Adrian Bunk wrote:
> static int
> acpi_bus_match (
> struct acpi_device *device,
> struct acpi_driver *driver)
> {
> if (driver && driver->ops.match)
> return driver->ops.match(device, driver);
> return acpi_match_ids(device, driver->ids);
> }
> Either driver can be NULL, in which case the driver->ids is a possible
> NULL pointer reference, or it can't, in which case the check whether
> it's NULL is superfluous.
Follow the mon^Wcall tree.
drivers/acpi/scan.c:478: * acpi_bus_match
drivers/acpi/scan.c:484:acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
drivers/acpi/scan.c:564: if (!acpi_bus_match(dev, drv)) {
drivers/acpi/scan.c:682: if (!acpi_bus_match(device, driver)) {
1. acpi_bus_match()
Second arg is passed without changes.
acpi_driver_attach()
acpi_bus_register_driver()
===> if (!driver) <===
return_VALUE(-EINVAL);
spin_lock(&acpi_device_lock);
list_add_tail(&driver->node, &acpi_bus_drivers);
spin_unlock(&acpi_device_lock);
count = acpi_driver_attach(driver);
2. acpi_bus_match()
acpi_bus_find_driver()
atomic_inc(&driver->references);
^^^^^^^^
spin_unlock(&acpi_device_lock);
if (!acpi_bus_match(device, driver)) {
Looks like it can't.
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