[intel] Bug #13636: Allow recursive buffer mapping in bufmgr_ttm.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/common/dri_bufmgr_fake.c b/src/mesa/drivers/dri/common/dri_bufmgr_fake.c
index 7212ee84ab1..8f67798a085 100644
--- a/src/mesa/drivers/dri/common/dri_bufmgr_fake.c
+++ b/src/mesa/drivers/dri/common/dri_bufmgr_fake.c
@@ -712,7 +712,10 @@ dri_fake_bo_map(dri_bo *bo, GLboolean write_enable)
    if (bo_fake->is_static)
       return 0;
 
-   /* Allow recursive mapping, which is used internally in relocation. */
+   /* Allow recursive mapping.  Mesa may recursively map buffers with
+    * nested display loops, and it is used internally in bufmgr_fake
+    * for relocation.
+    */
    if (bo_fake->map_count++ != 0)
       return 0;