diff options
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 26a5833c9f29..97926b1277b2 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -880,10 +880,24 @@ static void __dma_page_dev_to_cpu(struct page *page, unsigned long off, dma_cache_maint_page(page, off, size, dir, dmac_unmap_area); /* - * Mark the D-cache clean for this page to avoid extra flushing. + * Mark the D-cache clean for these pages to avoid extra flushing. */ - if (dir != DMA_TO_DEVICE && off == 0 && size >= PAGE_SIZE) - set_bit(PG_dcache_clean, &page->flags); + if (dir != DMA_TO_DEVICE && size >= PAGE_SIZE) { + unsigned long pfn; + size_t left = size; + + pfn = page_to_pfn(page) + off / PAGE_SIZE; + off %= PAGE_SIZE; + if (off) { + pfn++; + left -= PAGE_SIZE - off; + } + while (left >= PAGE_SIZE) { + page = pfn_to_page(pfn++); + set_bit(PG_dcache_clean, &page->flags); + left -= PAGE_SIZE; + } + } } /** |