D49388.diff
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	Index: sys/compat/linuxkpi/common/include/linux/pci.h
	===================================================================
	--- sys/compat/linuxkpi/common/include/linux/pci.h
	+++ sys/compat/linuxkpi/common/include/linux/pci.h
	@@ -523,7 +523,18 @@
	if (pdev == pdev->bus->self) {
	device_t bridge;

	- bridge = device_get_parent(pdev->dev.bsddev);
	+ /*
	+ * In the case of DRM drivers, the passed device is a child of
	+ * `vgapci` and has a devclass of `drmn`. We want to start the
	+ * lookup from `vgapci`, so the parent of the passed `drmn`.
	+ */
	+ bridge = pdev->dev.bsddev;
	+ if (device_get_devclass(bridge) == devclass_find("drmn"))
	+ bridge = device_get_parent(bridge);
	+ if (bridge == NULL)
	+ goto done;
	+
	+ bridge = device_get_parent(bridge);
	if (bridge == NULL)
	goto done;
	bridge = device_get_parent(bridge);