[src/trunk]: src/sys/arch/i386/i386 Initialize pcibus_attach_args.pba_sub to ...

[dyoung <dyoung%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/852979496d9b
branches:  trunk
changeset: 773578:852979496d9b
user:      dyoung <dyoung%NetBSD.org@localhost>
date:      Tue Feb 07 16:34:44 2012 +0000

description:
Initialize pcibus_attach_args.pba_sub to 255.  Note in a comment that
this needs some improvement for machines with >1 Host-PCI bridge, but
that it doesn't cause any practical problems at this time.

Ok releng@.

diffstat:

 sys/arch/i386/i386/mainbus.c |  11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diffs (32 lines):

diff -r 574a5083264f -r 852979496d9b sys/arch/i386/i386/mainbus.c
--- a/sys/arch/i386/i386/mainbus.c      Tue Feb 07 14:14:45 2012 +0000
+++ b/sys/arch/i386/i386/mainbus.c      Tue Feb 07 16:34:44 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mainbus.c,v 1.93 2012/01/18 21:34:38 drochner Exp $    */
+/*     $NetBSD: mainbus.c,v 1.94 2012/02/07 16:34:44 dyoung Exp $      */
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mainbus.c,v 1.93 2012/01/18 21:34:38 drochner Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mainbus.c,v 1.94 2012/02/07 16:34:44 dyoung Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -406,6 +406,13 @@
                mba.mba_pba.pba_pc = NULL;
                mba.mba_pba.pba_flags = pci_bus_flags();
                mba.mba_pba.pba_bus = 0;
+               /* XXX On those machines with >1 Host-PCI bridge,
+                * XXX not every bus > pba_bus is subordinate to pba_bus,
+                * XXX but this works on many machines, and pba_sub is
+                * XXX not used today by any critical code, so it is safe
+                * XXX to be so inclusive at this time.
+                */
+               mba.mba_pba.pba_sub = 255;
                mba.mba_pba.pba_bridgetag = NULL;
 #if NACPICA > 0 && defined(ACPI_SCANPCI)
                if (npcibus == 0 && sc->sc_mpacpi_active)