gpu: ion: Don't flush allocatoins that come from the page pools

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/ion_system_heap.c

@@ -76,9 +76,14 @@ static struct page *alloc_buffer_page(struct ion_system_heap *heap,
 		if (order > 4)
 			gfp_flags = high_order_gfp_flags;
 		page = alloc_pages(gfp_flags, order);
+		if (!page)
+			return 0;
+		__dma_page_cpu_to_dev(page, 0, PAGE_SIZE << order,
+				      DMA_BIDIRECTIONAL);
 	}
 	if (!page)
 		return 0;
+
 	if (split_pages)
 		split_page(page, order);
 	return page;
@@ -201,9 +206,6 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
 		kfree(info);
 	}
 
-	dma_sync_sg_for_device(NULL, table->sgl, table->nents,
-			       DMA_BIDIRECTIONAL);
-
 	buffer->priv_virt = table;
 	return 0;
 err1: