x86_64: only reserve the first 1MB of IO space for CalIOC2

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index 22c2d6250bff..6b76e2fc9249 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -806,13 +806,13 @@ static void __init calgary_reserve_regions(struct pci_dev *dev)
         iommu_range_reserve(tbl, bad_dma_address, EMERGENCY_PAGES);
 
         /* avoid the BIOS/VGA first 640KB-1MB region */
-        /* for CalIOC2 - avoid the entire first 2MB */
+        /* for CalIOC2 - avoid the entire first MB */
         if (is_calgary(dev->device)) {
                 start = (640 * 1024);
                 npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
         } else { /* calioc2 */
                 start = 0;
-                npages = (2 * 1024 * 1024) >> PAGE_SHIFT;
+                npages = (1 * 1024 * 1024) >> PAGE_SHIFT;
         }
         iommu_range_reserve(tbl, start, npages);