drm/radeon/kms: record object that have been list reserved

list reservation was too optimistic about ttm object reservation
and could think that an object reserved by some other process
as reserved by the list reservation which was false. Thus when
unreserving the list it might unreserve object that it didn't
reserved in the list. Sorry if it's hard to follow but this
kind of things are just causing headheck.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 5c9ce2beaca3..66a37fb75839 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -261,6 +261,7 @@ struct radeon_bo_list {
         unsigned                rdomain;
         unsigned                wdomain;
         u32                     tiling_flags;
+        bool                    reserved;
 };
 
 /*
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index a8d18bcae7db..d5b9373ce06c 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -301,6 +301,7 @@ int radeon_bo_list_reserve(struct list_head *head)
                 r = radeon_bo_reserve(lobj->bo, false);
                 if (unlikely(r != 0))
                         return r;
+                lobj->reserved = true;
         }
         return 0;
 }
@@ -311,7 +312,7 @@ void radeon_bo_list_unreserve(struct list_head *head)
 
         list_for_each_entry(lobj, head, list) {
                 /* only unreserve object we successfully reserved */
-                if (radeon_bo_is_reserved(lobj->bo))
+                if (lobj->reserved && radeon_bo_is_reserved(lobj->bo))
                         radeon_bo_unreserve(lobj->bo);
         }
 }
@@ -322,6 +323,9 @@ int radeon_bo_list_validate(struct list_head *head)
         struct radeon_bo *bo;
         int r;
 
+        list_for_each_entry(lobj, head, list) {
+                lobj->reserved = false;
+        }
         r = radeon_bo_list_reserve(head);
         if (unlikely(r != 0)) {
                 return r;