Am 20.02.2018 um 10:37 schrieb Chris Wilson:
When we descend the tree to find our slot, if we step to the right, we
are no longer the leftmost node.
Fixes: f808c13fd373 ("lib/interval_tree: fast overlap detection")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Davidlohr Bueso <dbueso@xxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Acked-by: Christian König <christian.koenig@xxxxxxx> for now.
But I agree with Joonas that we should think about using
rb_insert_augmented instead when we actually don't use the extra
functionality.
Christian.
---
drivers/gpu/drm/drm_mm.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 89eef1bb4ddc..3166026a1874 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -180,7 +180,7 @@ static void drm_mm_interval_tree_add_node(struct drm_mm_node *hole_node,
struct drm_mm *mm = hole_node->mm;
struct rb_node **link, *rb;
struct drm_mm_node *parent;
- bool leftmost = true;
+ bool leftmost;
node->__subtree_last = LAST(node);
@@ -201,6 +201,7 @@ static void drm_mm_interval_tree_add_node(struct drm_mm_node *hole_node,
} else {
rb = NULL;
link = &mm->interval_tree.rb_root.rb_node;
+ leftmost = true;
}
while (*link) {
@@ -208,11 +209,11 @@ static void drm_mm_interval_tree_add_node(struct drm_mm_node *hole_node,
parent = rb_entry(rb, struct drm_mm_node, rb);
if (parent->__subtree_last < node->__subtree_last)
parent->__subtree_last = node->__subtree_last;
- if (node->start < parent->start)
+ if (node->start < parent->start) {
link = &parent->rb.rb_left;
- else {
+ } else {
link = &parent->rb.rb_right;
- leftmost = true;
+ leftmost = false;
}
}
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