drm/ast: invalidate page tables when pinning a BO

same fix as cirrus and mgag200.

Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c
index 98d670825a1a..6e8887fe6c1b 100644
--- a/drivers/gpu/drm/ast/ast_ttm.c
+++ b/drivers/gpu/drm/ast/ast_ttm.c
@@ -323,6 +323,7 @@ int ast_bo_create(struct drm_device *dev, int size, int align,
 
         astbo->gem.driver_private = NULL;
         astbo->bo.bdev = &ast->ttm.bdev;
+        astbo->bo.bdev->dev_mapping = dev->dev_mapping;
 
         ast_ttm_placement(astbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);