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ofwbus: only allow unit number zero

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ofwbus has always been the root of attachment for OFW/FDT platforms. It
may have simplebus children, but we expect only one instance of the
ofwbus driver, added directly by nexus. We may as well ensure this
remains the case.

Reviewed by:	jhb
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D38493
This commit is contained in:
Mitchell Horne 2023-02-13 13:44:03 -04:00
parent 53d5e65eea
commit afca197f52
1 changed files with 5 additions and 0 deletions
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5
sys/dev/ofw/ofwbus.c
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@ -89,6 +89,11 @@ ofwbus_probe(device_t dev)
if (OF_peer(0) == 0)
return (ENXIO);
/* Only one instance of ofwbus. */
if (device_get_unit(dev) != 0)
panic("ofwbus added with non-zero unit number: %d\n",
device_get_unit(dev));
device_set_desc(dev, "Open Firmware Device Tree");
return (BUS_PROBE_NOWILDCARD);
}