drivers/gpu/drm/via: convert put_page() to put_user_page*()

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in fc1d8e7c ("mm:
introduce put_user_page*(), placeholder versions").

Also reverse the order of a comparison, in order to placate checkpatch.pl.

Link: http://lkml.kernel.org/r/20190724044537.10458-3-jhubbard@nvidia.comSigned-off-by: John Hubbard <jhubbard@nvidia.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/gpu/drm/via/via_dmablit.c

@@ -174,7 +174,6 @@ via_map_blit_for_device(struct pci_dev *pdev,
 static void
 via_free_sg_info(struct pci_dev *pdev, drm_via_sg_info_t *vsg)
 {
-	struct page *page;
 	int i;
 
 	switch (vsg->state) {
@@ -189,13 +188,8 @@ via_free_sg_info(struct pci_dev *pdev, drm_via_sg_info_t *vsg)
 		kfree(vsg->desc_pages);
 		/* fall through */
 	case dr_via_pages_locked:
-		for (i = 0; i < vsg->num_pages; ++i) {
-			if (NULL != (page = vsg->pages[i])) {
-				if (!PageReserved(page) && (DMA_FROM_DEVICE == vsg->direction))
-					SetPageDirty(page);
-				put_page(page);
-			}
-		}
+		put_user_pages_dirty_lock(vsg->pages, vsg->num_pages,
+					  (vsg->direction == DMA_FROM_DEVICE));
 		/* fall through */
 	case dr_via_pages_alloc:
 		vfree(vsg->pages);