intel-iommu mistakenly uses offset_pfn when caching mode is enabled

intel_map_sg used offset_pfn which was set to zero when invalidating the IOTLB.
intel_map_sg now uses size variable for this matter.

Signed-off-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index a0ac719..341da41 100644 (file)
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2860,7 +2860,6 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int ne
        struct dmar_domain *domain;
        size_t size = 0;
        int prot = 0;
-       size_t offset_pfn = 0;
        struct iova *iova = NULL;
        int ret;
        struct scatterlist *sg;
@@ -2914,7 +2913,7 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int ne
 
        /* it's a non-present to present mapping. Only flush if caching mode */
        if (cap_caching_mode(iommu->cap))
-               iommu_flush_iotlb_psi(iommu, 0, start_vpfn, offset_pfn);
+               iommu_flush_iotlb_psi(iommu, 0, start_vpfn, size);
        else
                iommu_flush_write_buffer(iommu);