config_init_component(), ioconf, and pseudo-devices

[Paul Goyette <paul%vps1.whooppee.com@localhost>]

I'm working on turning swwdog (for now, eventually others) into a kernel 
module, and I'm running into some difficulty with the autoconfig stuff.

I've got an IOCONF=swwdog.ioconf in my Makefile, and swwdog.ioconf 
contains

	ioconf swwdog
	include "conf/files"
	include "dev/sysmon/files.sysmon"
	pseudo-device   swwdog

In files.sysmon there is

	defpseudodev swwdog: sysmon_wdog
	file    dev/sysmon/swwdog.c             swwdog

In the swwdog_modcmd()'s init code, I am calling

	config_init_component(cfdriver_ioconf_swwdog,
	    cfattach_ioconf_swwdog, cfdata_ioconf_swwdog);

where the arguments are all references to data structures defined in the 
generated ioconf.[ch] files.

The problem occurs a bit later on when I create a local struct cfattach

	cf.cf_name = "swwdog";
	cf.cf_atname = "swwdog";
	cf.cf_unit = 0;
	cf.cf_fstate = FSTATE_STAR;
	cf.cf_pspec = NULL;
	cf.cf_loc = NULL;
	cf.cf_flags = 0;

and attempt to call config_attach_pseudo().  config_attach_pseudo() 
calls config_devalloc() to allocate memory (primarily for the softc), 
and config_devalloc() in turn locates the swwdog's struct cfdriver 
(which was "frobbed" into the master device list by 
config_init_component()).

Next, config_devalloc() tries to find a struct cfattach in the cfdriver 
list of attachments.  Unfortunately, the generated ioconf.c file has 
empty lists of both struct cfdata and struct cfattach, so no struct 
cfattach ever got "frobbed" by config_init_component, and thus the call 
to cf_attach_lookup_cd() fails.

...
static struct cfdata cfdata_ioconf_swwdog[] = {
    /* driver       attachment    unit state      loc   flags  pspec */
    { NULL,         NULL,            0,    0,    NULL,      0, NULL }
};


static const struct cfattachinit cfattach_ioconf_swwdog[] = {
        { NULL, NULL }
};
...


Am I missing something obvious here?  Or is config not generating valid 
ioconf.[ch] files for a defpseudodev device?



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