Clarify order of operations

diff --git a/shared-core/i915_dma.c b/shared-core/i915_dma.c
index d86f86c..31df743 100644 (file)
--- a/shared-core/i915_dma.c
+++ b/shared-core/i915_dma.c
@@ -1102,7 +1102,7 @@ static int i915_do_cleanup_pageflip(struct drm_device * dev)
                if (dev_priv->sarea_priv->pf_current_page & (0x3 << (2 * i))) {
                        dev_priv->sarea_priv->pf_current_page =
                                (dev_priv->sarea_priv->pf_current_page &
-                                ~(0x3 << (2 * i))) | (num_pages - 1) << (2 * i);
+                                ~(0x3 << (2 * i))) | ((num_pages - 1) << (2 * i));
 
                        planes |= 1 << i;
                }