From a27d4bdc9f6282b295ceccfbed0f3c18ff93d13c Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 12 Jul 2011 13:28:39 +0000
Subject: [PATCH] Properly align the end of a candidate back region based on
 the window's granularity when growing a PCI-PCI window up.

Tested by:	dougb
MFC after:	3 days
---
 sys/dev/pci/pci_pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/dev/pci/pci_pci.c b/sys/dev/pci/pci_pci.c
index 93bbf3ab91f..5cbfb4d043a 100644
--- a/sys/dev/pci/pci_pci.c
+++ b/sys/dev/pci/pci_pci.c
@@ -954,7 +954,7 @@ pcib_grow_window(struct pcib_softc *sc, struct pcib_window *w, int type,
 			if (bootverbose)
 				printf("\tback candidate range: %#lx-%#lx\n",
 				    start_free, back);
-			back = roundup2(back + 1, w->step) - 1;
+			back = roundup2(back + 1, 1ul << w->step) - 1;
 			back -= rman_get_end(w->res);
 		} else
 			back = 0;