According to "PCI Express Base Specification Revision 3.0" from
November 10, 2010, section 7.9.1 an Extended Capability header with value 0:0:0 represents the absence of Extended Capabilities.
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@ -1,4 +1,4 @@
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/* $NetBSD: acpi_mcfg.c,v 1.3 2016/07/12 09:29:32 hannken Exp $ */
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/* $NetBSD: acpi_mcfg.c,v 1.4 2016/07/12 09:45:34 hannken Exp $ */
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/*-
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* Copyright (C) 2015 NONAKA Kimihiro <nonaka@NetBSD.org>
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@ -26,7 +26,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: acpi_mcfg.c,v 1.3 2016/07/12 09:29:32 hannken Exp $");
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__KERNEL_RCSID(0, "$NetBSD: acpi_mcfg.c,v 1.4 2016/07/12 09:45:34 hannken Exp $");
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#include <sys/param.h>
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#include <sys/device.h>
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@ -490,7 +490,7 @@ acpimcfg_device_probe(const struct pci_attach_args *pa)
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/* Probe extended configuration space. */
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if (((reg = pci_conf_read(pc, tag, PCI_CONF_SIZE)) == (pcireg_t)-1) ||
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(alias = acpimcfg_ext_conf_is_aliased(pc, tag))) {
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(reg == 0) || (alias = acpimcfg_ext_conf_is_aliased(pc, tag))) {
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aprint_debug_dev(acpi_sc->sc_dev,
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"MCFG: %03d:%02d:%d: invalid config space "
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"(cfg[0x%03x]=0x%08x, alias=%s)\n", bus, dev, func,
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