On Wed, 6 Aug 2003, Soewono Effendi wrote:
> As far as I understand, __init / __devinit is only relevant for device
> driver (codes) that are statically linked. In the case of USB Device
> Driver (not usbcore / usbhost ), one should actually not use
> __init/__devinit, since USB probe can happen at any time, unless the
> device is "static", i.e., not unplugable (I don't know if this word does
> exist :) ).
>From Documentation/pci.txt:
Please mark the initialization and cleanup functions where appropriate
(the corresponding macros are defined in <linux/init.h>):
__init Initialization code. Thrown away after the driver
initializes.
__exit Exit code. Ignored for non-modular drivers.
__devinit Device initialization code. Identical to __init if
the kernel is not compiled with CONFIG_HOTPLUG, normal
function otherwise.
__devexit The same for __exit.
Tips:
The module_init()/module_exit() functions (and all initialization
functions called only from these) should be marked __init/exit.
The struct pci_driver shouldn't be marked with any of these tags.
The ID table array should be marked __devinitdata.
The probe() and remove() functions (and all initialization
functions called only from these) should be marked __devinit/exit.
If you are sure the driver is not a hotplug driver then use only
__init/exit __initdata/exitdata.
Pointers to functions marked as __devexit must be created using
__devexit_p(function_name). That will generate the function
name or NULL if the __devexit function will be discarded.
The upshot is that for USB, which is hotpluggable, __devinit and __devexit
are useless. __init and __exit should be used for module initialization
and removal routines, not for probing and disconnecting.
Alan Stern
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