D53202.id164550.diff
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D53202.id164550.diff
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	diff --git a/sys/dev/thunderbolt/tb_pcib.c b/sys/dev/thunderbolt/tb_pcib.c
	--- a/sys/dev/thunderbolt/tb_pcib.c
	+++ b/sys/dev/thunderbolt/tb_pcib.c
	@@ -557,8 +557,20 @@
	tb_pci_probe(device_t dev)
	{
	struct tb_pcib_ident *n;
	+ device_t parent;
	+ devclass_t dc;

	- if ((n = tb_pcib_find_ident(device_get_parent(dev))) != NULL) {
	+ /*
	+ * This driver is only valid if the parent device is a PCI-PCI
	+ * bridge. To determine that, check if the grandparent is a
	+ * PCI bus.
	+ */
	+ parent = device_get_parent(dev);
	+ dc = device_get_devclass(device_get_parent(parent));
	+ if (strcmp(devclass_get_name(dc), "pci") != 0)
	+ return (ENXIO);
	+
	+ if ((n = tb_pcib_find_ident(parent)) != NULL) {
	switch (n->flags & TB_GEN_MASK) {
	case TB_GEN_TB1:
	device_set_desc(dev, "Thunderbolt 1 Link");