intel-iommu: Don't keep freeing page zero in dma_pte_free_pagetable()

Check dma_pte_present() and only free the page if there _is_ one. Kind of surprising that there was no warning about this. Signed-off-by: David Woodhouse <[email protected]>
Findingmyway · Jul 2, 2009 · 6a43e57 · 6a43e57
1 parent 75e6bf9
commit 6a43e57
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
@@ -826,8 +826,10 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain,
 				continue;
 			}
 			do {
-				free_pgtable_page(phys_to_virt(dma_pte_addr(pte)));
-				dma_clear_pte(pte);
+				if (dma_pte_present(pte)) {
+					free_pgtable_page(phys_to_virt(dma_pte_addr(pte)));
+					dma_clear_pte(pte);
+				}
 				pte++;
 				tmp += level_size(level);
 			} while (!first_pte_in_page(pte) &&