D54487.diff
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	diff --git a/sys/compat/linuxkpi/common/include/linux/pci.h b/sys/compat/linuxkpi/common/include/linux/pci.h
	--- a/sys/compat/linuxkpi/common/include/linux/pci.h
	+++ b/sys/compat/linuxkpi/common/include/linux/pci.h
	@@ -253,6 +253,20 @@
	#define PCI_IRQ_LEGACY PCI_IRQ_INTX
	#endif

	+/*
	+ * Linux PCI code uses `PCI_SET_ERROR_RESPONSE()` to indicate to the caller of
	+ * a `pci_read_*()` function that the read failed. An example of failure is
	+ * whether the device was disconnected. It is a bit weird because Linux
	+ * `pci_read_*()` can return an error value, as the read value is stored in a
	+ * integer passed by pointer.
	+ *
	+ * We don't set PCI_ERROR_RESPONSE anywhere as of this commit, but the DRM
	+ * drivers started to use `PCI_POSSIBLE_ERROR()`.
	+ */
	+#define PCI_ERROR_RESPONSE (~0ULL)
	+#define PCI_SET_ERROR_RESPONSE(val) ((val) = ((typeof((val))) PCI_ERROR_RESPONSE))
	+#define PCI_POSSIBLE_ERROR(val) ((val) == ((typeof(val)) PCI_ERROR_RESPONSE))
	+
	struct pci_dev;

	struct pci_driver {