svn commit: r283516 - head/sys/x86/xen

[Roger Pau Monné]

Author: royger
Date: Mon May 25 09:47:16 2015
New Revision: 283516
URL: https://svnweb.freebsd.org/changeset/base/283516

Log:
  xen: make sure xenpv bus is the last to attach
  
  This is needed so other buses have a chance of attaching a real ISA bus, if
  none is found xenpv will attach it.
  
  Sponsored by: Citrix Systems R&D

Modified:
  head/sys/x86/xen/xenpv.c

Modified: head/sys/x86/xen/xenpv.c
==============================================================================
--- head/sys/x86/xen/xenpv.c	Mon May 25 09:08:19 2015	(r283515)
+++ head/sys/x86/xen/xenpv.c	Mon May 25 09:47:16 2015	(r283516)
@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/pcpu.h>
 #include <sys/rman.h>
 #include <sys/smp.h>
+#include <sys/limits.h>
 
 #include <vm/vm.h>
 #include <vm/vm_page.h>
@@ -72,7 +73,11 @@ xenpv_identify(driver_t *driver, device_
 	if (devclass_get_device(xenpv_devclass, 0))
 		return;
 
-	if (BUS_ADD_CHILD(parent, 0, "xenpv", 0) == NULL)
+	/*
+	 * The xenpv bus should be the last to attach in order
+	 * to properly detect if an ISA bus has already been added.
+	 */
+	if (BUS_ADD_CHILD(parent, UINT_MAX, "xenpv", 0) == NULL)
 		panic("Unable to attach xenpv bus.");
 }