diff options
Diffstat (limited to 'arch/sparc/mm/iommu.c')
| -rw-r--r-- | arch/sparc/mm/iommu.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c index 7e191c8ae46a..37b5ce7657f6 100644 --- a/arch/sparc/mm/iommu.c +++ b/arch/sparc/mm/iommu.c @@ -209,24 +209,23 @@ static u32 iommu_get_one(struct device *dev, phys_addr_t paddr, int npages) static dma_addr_t __sbus_iommu_map_page(struct device *dev, struct page *page, unsigned long offset, size_t len, bool per_page_flush) { - void *vaddr = page_address(page) + offset; - unsigned long off = (unsigned long)vaddr & ~PAGE_MASK; + phys_addr_t paddr = page_to_phys(page) + offset; + unsigned long off = paddr & ~PAGE_MASK; unsigned long npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT; /* XXX So what is maxphys for us and how do drivers know it? */ if (!len || len > 256 * 1024) return DMA_MAPPING_ERROR; - if (per_page_flush) { - unsigned long p = (unsigned long)vaddr & PAGE_MASK; + if (per_page_flush && !PageHighMem(page)) { + unsigned long vaddr, p; - while (p < (unsigned long)vaddr + len) { + vaddr = (unsigned long)page_address(page) + offset; + for (p = vaddr & PAGE_MASK; p < vaddr + len; p += PAGE_SIZE) flush_page_for_dma(p); - p += PAGE_SIZE; - } } - return iommu_get_one(dev, virt_to_phys(vaddr), npages) + off; + return iommu_get_one(dev, paddr, npages) + off; } static dma_addr_t sbus_iommu_map_page_gflush(struct device *dev, |