From 6a43e574c5af7d9bd084992b1c9c3cdbc3b6c0e9 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Thu, 2 Jul 2009 12:02:34 +0100 Subject: 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 --- drivers/pci/intel-iommu.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index dcf0295a9b60..53075424a434 100644 --- 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) && -- cgit v1.2.2