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| author | Benjamin LaHaise <ben.lahaise@neterion.com> | 2009-09-16 21:05:55 -0400 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-09-19 09:26:20 -0700 |
| commit | 64de5af000e99f32dd49ff5dd9a0fd7db1f60305 (patch) | |
| tree | f26d720da22d1b3afd24c4edebb26f7b3318ba4b /drivers/pci/intel-iommu.c | |
| parent | 59c36286b74ae6a8adebf6e133a83d7f2e3e6704 (diff) | |
| download | lwn-64de5af000e99f32dd49ff5dd9a0fd7db1f60305.tar.gz lwn-64de5af000e99f32dd49ff5dd9a0fd7db1f60305.zip | |
intel-iommu: Fix integer wrap on 32 bit kernels
The following 64 bit promotions are necessary to handle memory above the
4GiB boundary correctly.
[dwmw2: Fix the second part not to need 64-bit arithmetic at all]
Signed-off-by: Benjamin LaHaise <ben.lahaise@neterion.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci/intel-iommu.c')
| -rw-r--r-- | drivers/pci/intel-iommu.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 5493c79dde47..52026d1797ec 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -735,7 +735,7 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain, return NULL; domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE); - pteval = (virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE; + pteval = ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE; if (cmpxchg64(&pte->val, 0ULL, pteval)) { /* Someone else set it while we were thinking; use theirs. */ free_pgtable_page(tmp_page); @@ -2648,10 +2648,9 @@ static void flush_unmaps(void) unsigned long mask; struct iova *iova = deferred_flush[i].iova[j]; - mask = (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT; - mask = ilog2(mask >> VTD_PAGE_SHIFT); + mask = ilog2(mm_to_dma_pfn(iova->pfn_hi - iova->pfn_lo + 1)); iommu_flush_dev_iotlb(deferred_flush[i].domain[j], - iova->pfn_lo << PAGE_SHIFT, mask); + (uint64_t)iova->pfn_lo << PAGE_SHIFT, mask); __free_iova(&deferred_flush[i].domain[j]->iovad, iova); } deferred_flush[i].next = 0; |