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x86/amd-iommu: Use fetch_pte in iommu_unmap_page

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Instead of reimplementing existing logic use fetch_pte to
walk the page table in iommu_unmap_page.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-09-02 17:02:47 +02:00
parent 9355a08186
commit 38a76eeeaf
1 changed files with 3 additions and 16 deletions
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17
arch/x86/kernel/amd_iommu.c
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@ -546,22 +546,9 @@ static int iommu_map_page(struct protection_domain *dom,
static void iommu_unmap_page(struct protection_domain *dom,
unsigned long bus_addr)
{
u64 *pte;
pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)];
if (!IOMMU_PTE_PRESENT(*pte))
return;
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
if (!IOMMU_PTE_PRESENT(*pte))
return;
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
u64 *pte = fetch_pte(dom, bus_addr);
if (pte)
*pte = 0;
}