intel-iommu: Fix address wrap on 32-bit kernel.

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The problem is in dma_pte_clear_range and dma_pte_free_pagetable. When
intel_unmap_single and intel_unmap_sg call them, the end address may be
zero if the 'start_addr + size' rounds up. So no PTE gets cleared. The
uncleared PTE fires the BUG_ON when it's used again to create new mappings.

After I modified dma_pte_clear_range a bit, the BUG_ON is gone.

Tested both 32 and 32 PAE modes on Intel X58 and Q35 platforms.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

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Zhao, Yu 2009-02-13 17:55:49 +08:00 • committed by David Woodhouse

parent 4cf2e75d0b

commit afeeb7cebb

1 changed files with 3 additions and 1 deletions

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drivers/pci/intel-iommu.c

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