drm: omapdrm: use common helper for extracting pages array

Use common helper for converting a sg_table object into struct
page pointer array.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>

drivers/gpu/drm/omapdrm/omap_gem.c

@@ -1297,10 +1297,9 @@ struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
 		omap_obj->dma_addr = sg_dma_address(sgt->sgl);
 	} else {
 		/* Create pages list from sgt */
-		struct sg_page_iter iter;
 		struct page **pages;
 		unsigned int npages;
-		unsigned int i = 0;
+		unsigned int ret;
 
 		npages = DIV_ROUND_UP(size, PAGE_SIZE);
 		pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
@@ -1311,14 +1310,9 @@ struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
 		}
 
 		omap_obj->pages = pages;
-
+		ret = drm_prime_sg_to_page_addr_arrays(sgt, pages, NULL,
-		for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
+						       npages);
-			pages[i++] = sg_page_iter_page(&iter);
+		if (ret) {
-			if (i > npages)
-				break;
-		}
-
-		if (WARN_ON(i != npages)) {
 			omap_gem_free_object(obj);
 			obj = ERR_PTR(-ENOMEM);
 			goto done;