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

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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 <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-07-02 12:02:34 +01:00
parent 75e6bf9638
commit 6a43e574c5
1 changed files with 4 additions and 2 deletions
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6
drivers/pci/intel-iommu.c
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@ -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) &&