On Wednesday 25 October 2006 21:58, Bjorn Helgaas wrote: > This driver is for non-hot-pluggable hardware. Therefore, if the > hardware isn't present, we want to return -ENODEV so a module load > will fail. > > We previously returned "result" from the acpi_bus_register_driver() > call. Registering the driver usually succeeds even if no devices are > present, because the ACPI core allows you to load a driver before a > device is hot-added. > > Someday the kernel will expose enough information so user-space can > tell what ACPI drivers should be loaded. But the kernel doesn't do > that yet, so distros have to load this driver always and rely on the > -ENODEV causing the load to fail if the hardware isn't found. > > Signed-off-by: Bjorn Helgaas <bjorn.helgaas@xxxxxx> Signed-off-by: Frank Seidel <fseidel@xxxxxxx>
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