diff options
Diffstat (limited to 'arch/arm/common/dmabounce.c')
| -rw-r--r-- | arch/arm/common/dmabounce.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c index 3b184d3cbcc3..aa0180390dd8 100644 --- a/arch/arm/common/dmabounce.c +++ b/arch/arm/common/dmabounce.c @@ -241,6 +241,25 @@ static inline dma_addr_t map_single_or_page(struct device *dev, void *ptr, else dma_addr = virt_to_dma(dev, ptr); + if (dev->dma_mask) { + unsigned long mask = *dev->dma_mask; + unsigned long limit; + + limit = (mask - 1) | mask; + limit = (limit + 1) & ~limit; + if (limit && size > limit) { + dev_err(dev, "DMA mapping too big (requested %#x " + "mask %#Lx)\n", size, *dev->dma_mask); + return ~0; + } + + /* + * Figure out if we need to bounce from the DMA mask. + */ + needs_bounce = (dma_addr & ~mask) || + (limit && (dma_addr + size > limit)); + } + if (device_info && (needs_bounce || dma_needs_bounce(dev, dma_addr, size))) { struct safe_buffer *buf; |