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-rw-r--r--drivers/pci/intel-iommu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 0c12d06bade6..002c8b95edf8 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -718,15 +718,17 @@ static void dma_pte_clear_one(struct dmar_domain *domain, u64 addr)
static void dma_pte_clear_range(struct dmar_domain *domain, u64 start, u64 end)
{
int addr_width = agaw_to_width(domain->agaw);
+ int npages;
start &= (((u64)1) << addr_width) - 1;
end &= (((u64)1) << addr_width) - 1;
/* in case it's partial page */
start = PAGE_ALIGN(start);
end &= PAGE_MASK;
+ npages = (end - start) / VTD_PAGE_SIZE;
/* we don't need lock here, nobody else touches the iova range */
- while (start < end) {
+ while (npages--) {
dma_pte_clear_one(domain, start);
start += VTD_PAGE_SIZE;
}
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