Don't return -10000 as the probe priority. That's lower than what

BUS_PROBE_HOOVER is. Drivers like proto(4), when compiled into the
kernel or preloaded, will render your system useless by virtue of
attaching to your PCI busses.

Return BUS_PROBE_GENERIC instead. It's just the next priority up
from BUS_PROBE_HOOVER. No other meaning has been give to its use.
While BUS_PROBE_DEFAULT seems like a better candidate, it's hard
not to think that there must be some reason why these drivers
return -10000 in the first place.

Differential Revision:	D2705

sys/dev/pci/eisa_pci.c

@@ -100,7 +100,7 @@ eisab_probe(device_t dev)
     
     if (matched) {
 	device_set_desc(dev, "PCI-EISA bridge");
-	return(-10000);
+	return (BUS_PROBE_GENERIC);
     }
     return(ENXIO);
 }

sys/dev/pci/hostb_pci.c

@@ -63,7 +63,7 @@ pci_hostb_probe(device_t dev)
 	    pci_get_subclass(dev) == PCIS_BRIDGE_HOST) {
 		device_set_desc(dev, "Host to PCI bridge");
 		device_quiet(dev);
-		return (-10000);
+		return (BUS_PROBE_GENERIC);
 	}
 	return (ENXIO);
 }

sys/dev/pci/ignore_pci.c

@@ -66,7 +66,7 @@ ignore_pci_probe(device_t dev)
     case 0x10001042ul:	/* SMC 37C665 */
 	device_set_desc(dev, "ignored");
 	device_quiet(dev);
-	return(-10000);
+	return (BUS_PROBE_GENERIC);
     }
     return(ENXIO);
 }

sys/dev/pci/isa_pci.c

@@ -154,7 +154,7 @@ isab_pci_probe(device_t dev)
 
     if (matched) {
 	device_set_desc(dev, "PCI-ISA bridge");
-	return(-10000);
+	return (BUS_PROBE_GENERIC);
     }
     return(ENXIO);
 }

sys/dev/pci/pci_pci.c

@@ -890,7 +890,7 @@ pcib_probe(device_t dev)
     if ((pci_get_class(dev) == PCIC_BRIDGE) &&
 	(pci_get_subclass(dev) == PCIS_BRIDGE_PCI)) {
 	device_set_desc(dev, "PCI-PCI bridge");
-	return(-10000);
+	return (BUS_PROBE_GENERIC);
     }
     return(ENXIO);
 }