From owner-freebsd-new-bus@FreeBSD.ORG  Thu Mar 18 00:09:51 2004
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Date: Thu, 18 Mar 2004 16:10:06 +0800 (CST)
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To: new-bus@freebsd.org
From: "M. Warner Losh" <imp@bsdimp.com>
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Subject: ppbus probe problem
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: What is the correct way to fix the probe call incrementing problem?

Typically this is done by checking to see if there's a child already.

However, all the ISA drivers don't do this...  At work we've worked
around this problem like so:

static void
sub00798identify(driver_t * driver, device_t parent)
{
    devclass_t        dc;

    dc = devclass_find(DRIVERNAME);
    if (devclass_get_device(dc, 0) == NULL)
    {
        if (BUS_ADD_CHILD(parent, 0, DRIVERNAME, 0) == 0)
            panic("failed to add " DRIVERNAME);
    }
}

Warner