drm: mm: add helper to unwind scan state
With the switch to implicit free space accounting one pointer
got unused when scanning. Use it to create a single-linked list
to ensure correct unwinding of the scan state.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index d6432f9..add1737 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -460,6 +460,7 @@
mm->scan_hit_start = 0;
mm->scan_hit_size = 0;
mm->scan_check_range = 0;
+ mm->prev_scanned_node = NULL;
}
EXPORT_SYMBOL(drm_mm_init_scan);
@@ -485,6 +486,7 @@
mm->scan_start = start;
mm->scan_end = end;
mm->scan_check_range = 1;
+ mm->prev_scanned_node = NULL;
}
EXPORT_SYMBOL(drm_mm_init_scan_with_range);
@@ -514,6 +516,8 @@
prev_node->hole_follows = 1;
list_del(&node->node_list);
node->node_list.prev = &prev_node->node_list;
+ node->node_list.next = &mm->prev_scanned_node->node_list;
+ mm->prev_scanned_node = node;
hole_start = drm_mm_hole_node_start(prev_node);
hole_end = drm_mm_hole_node_end(prev_node);