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| author |   Zhao, Yu <yu.zhao@intel.com> | 2009-02-13 17:55:49 +0800 |
|---|---|---|
| committer |   David Woodhouse <David.Woodhouse@intel.com> | 2009-03-25 16:03:49 +0000 |
| commit | afeeb7cebbd223ffee303fd8de4ba97458b13581 (patch) | |
| tree | 834419e2fffecbba9f1d5cf6acb3a8765206e438 /drivers/base | |
| parent | intel-iommu: Enable DMAR on 32-bit kernel. (diff) | |
| download | linux-dev-afeeb7cebbd223ffee303fd8de4ba97458b13581.tar.xz linux-dev-afeeb7cebbd223ffee303fd8de4ba97458b13581.zip | |
intel-iommu: Fix address wrap on 32-bit kernel.
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>
Diffstat (limited to 'drivers/base')
0 files changed, 0 insertions, 0 deletions