intel-iommu: Fix off-by-one in RMRR setup

We were mapping an extra byte (and hence usually an extra page):
iommu_prepare_identity_map() expects to be given an 'end' argument which
is the last byte to be mapped; not the first byte *not* to be mapped.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index b0c96d3..a8867bd 100644 (file)
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2147,7 +2147,7 @@ static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr,
        if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO)
                return 0;
        return iommu_prepare_identity_map(pdev, rmrr->base_address,
-               rmrr->end_address + 1);
+               rmrr->end_address);
 }
 
 #ifdef CONFIG_DMAR_FLOPPY_WA
@@ -2161,7 +2161,7 @@ static inline void iommu_prepare_isa(void)
                return;
 
        printk(KERN_INFO "IOMMU: Prepare 0-16MiB unity mapping for LPC\n");
-       ret = iommu_prepare_identity_map(pdev, 0, 16*1024*1024);
+       ret = iommu_prepare_identity_map(pdev, 0, 16*1024*1024 - 1);
 
        if (ret)
                printk(KERN_ERR "IOMMU: Failed to create 0-16MiB identity map; "