diff options
| -rw-r--r-- | arch/x86/kernel/pci-calgary_64.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c index a50b787b3bf..ef05cc32a3a 100644 --- a/arch/x86/kernel/pci-calgary_64.c +++ b/arch/x86/kernel/pci-calgary_64.c @@ -222,6 +222,12 @@ static inline unsigned int num_dma_pages(unsigned long dma, unsigned int dmalen) return npages; } +static inline int translation_enabled(struct iommu_table *tbl) +{ + /* only PHBs with translation enabled have an IOMMU table */ + return (tbl != NULL); +} + static inline int translate_phb(struct pci_dev* dev) { int disabled = bus_info[dev->bus->number].translation_disabled; @@ -388,7 +394,7 @@ static void calgary_unmap_sg(struct device *dev, struct scatterlist *s; int i; - if (!translate_phb(to_pci_dev(dev))) + if (!translate_enabled(tbl)) return; for_each_sg(sglist, s, nelems, i) { @@ -428,7 +434,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg, unsigned long entry; int i; - if (!translate_phb(to_pci_dev(dev))) + if (!translation_enabled(tbl)) return calgary_nontranslate_map_sg(dev, sg, nelems, direction); for_each_sg(sg, s, nelems, i) { @@ -474,7 +480,7 @@ static dma_addr_t calgary_map_single(struct device *dev, void *vaddr, uaddr = (unsigned long)vaddr; npages = num_dma_pages(uaddr, size); - if (translate_phb(to_pci_dev(dev))) + if (translation_enabled(tbl)) dma_handle = iommu_alloc(tbl, vaddr, npages, direction); else dma_handle = virt_to_bus(vaddr); @@ -488,7 +494,7 @@ static void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle, struct iommu_table *tbl = find_iommu_table(dev); unsigned int npages; - if (!translate_phb(to_pci_dev(dev))) + if (!translation_enabled(tbl)) return; npages = num_dma_pages(dma_handle, size); @@ -513,7 +519,7 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size, goto error; memset(ret, 0, size); - if (translate_phb(to_pci_dev(dev))) { + if (translation_enabled(tbl)) { /* set up tces to cover the allocated range */ mapping = iommu_alloc(tbl, ret, npages, DMA_BIDIRECTIONAL); if (mapping == bad_dma_address) |