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amd-iommu: handle page table allocation failures in dma_ops code 

The code will be required when the aperture size increases dynamically
in the extended address allocator.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-05-12 12:17:38 +02:00
parent 8bda3092bc
commit 53812c115c
1 changed files with 18 additions and 2 deletions
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20
arch/x86/kernel/amd_iommu.c
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@ -1193,6 +1193,8 @@ static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu,
paddr &= PAGE_MASK;
pte = dma_ops_get_pte(dom, address);
if (!pte)
return bad_dma_address;
__pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
@ -1248,7 +1250,7 @@ static dma_addr_t __map_single(struct device *dev,
u64 dma_mask)
{
dma_addr_t offset = paddr & ~PAGE_MASK;
dma_addr_t address, start;
dma_addr_t address, start, ret;
unsigned int pages;
unsigned long align_mask = 0;
int i;
@ -1271,7 +1273,10 @@ static dma_addr_t __map_single(struct device *dev,
start = address;
for (i = 0; i < pages; ++i) {
dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);
ret = dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);
if (ret == bad_dma_address)
goto out_unmap;
paddr += PAGE_SIZE;
start += PAGE_SIZE;
}
@ -1287,6 +1292,17 @@ static dma_addr_t __map_single(struct device *dev,
out:
return address;
out_unmap:
for (--i; i >= 0; --i) {
start -= PAGE_SIZE;
dma_ops_domain_unmap(iommu, dma_dom, start);
}
dma_ops_free_addresses(dma_dom, address, pages);
return bad_dma_address;
}
/*