diff options
Diffstat (limited to 'arch/powerpc/kernel/dma.c')
| -rw-r--r-- | arch/powerpc/kernel/dma.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c index 8032b97..1a3dd00 100644 --- a/arch/powerpc/kernel/dma.c +++ b/arch/powerpc/kernel/dma.c @@ -31,6 +31,7 @@ void *dma_direct_alloc_coherent(struct device *dev, size_t size, struct dma_attrs *attrs) { void *ret; + phys_addr_t top_ram_pfn = memblock_end_of_DRAM(); #ifdef CONFIG_NOT_COHERENT_CACHE ret = __dma_alloc_coherent(dev, size, dma_handle, flag); if (ret == NULL) @@ -41,8 +42,18 @@ void *dma_direct_alloc_coherent(struct device *dev, size_t size, struct page *page; int node = dev_to_node(dev); + /* + * check for crappy device which has dma_mask < ZONE_DMA, and + * we are not going to support it, just warn and fail. + */ + if (*dev->dma_mask < DMA_BIT_MASK(31)) { + dev_err(dev, "Unsupported dma_mask 0x%llx\n", *dev->dma_mask); + return NULL; + } /* ignore region specifiers */ - flag &= ~(__GFP_HIGHMEM); + flag &= ~(__GFP_HIGHMEM | __GFP_DMA); + if (*dev->dma_mask < top_ram_pfn - 1) + flag |= GFP_DMA; page = alloc_pages_node(node, flag, get_order(size)); if (page == NULL) |