ARM: 7730/1: DMA-mapping: mark all !DMA_TO_DEVICE pages in unmapping as clean

[pandora-kernel.git] / arch / arm / mm / dma-mapping.c

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index e1c31e5..4d33340 100644 (file)
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -866,10 +866,24 @@ 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;
+               }
+       }
 }
 
 /**