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iommu: Check for valid pgsize_bitmap in iommu_map/unmap 

In case the page-size bitmap is zero the code path in
iommu_map and iommu_unmap is undefined. Make it defined and
return -ENODEV in this case.

Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Joerg Roedel 2013-01-29 13:41:09 +01:00
parent a8b8a88a9e
commit 57886518a8
1 changed files with 4 additions and 2 deletions
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6
drivers/iommu/iommu.c
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@ -734,7 +734,8 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
size_t orig_size = size;
int ret = 0;
if (unlikely(domain->ops->map == NULL))
if (unlikely(domain->ops->unmap == NULL ||
domain->ops->pgsize_bitmap == 0UL))
return -ENODEV;
/* find out the minimum page size supported */
@ -808,7 +809,8 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
size_t unmapped_page, unmapped = 0;
unsigned int min_pagesz;
if (unlikely(domain->ops->unmap == NULL))
if (unlikely(domain->ops->unmap == NULL ||
domain->ops->pgsize_bitmap == 0UL))
return -ENODEV;
/* find out the minimum page size supported */