[PATCH v4 29/38] drm: Fix application of color vs range restriction when scanning drm_mm

Chris Wilson
2016-12-22T08:36:32Z

The range restriction should be applied after the color adjustment, or
else we may inadvertently apply the color adjustment to the restricted
hole (and not against its neighbours).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
drivers/gpu/drm/drm_mm.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index c68f79149b9a..1b5613bcb35e 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -772,6 +772,7 @@ bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
struct drm_mm *mm = scan->mm;
struct drm_mm_node *hole;
u64 hole_start, hole_end;
+ u64 col_start, col_end;
u64 adj_start, adj_end;

DRM_MM_BUG_ON(node->mm != mm);
@@ -789,14 +790,16 @@ bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
node->node_list.next = &scan->prev_scanned_node->node_list;
scan->prev_scanned_node = node;

- hole_start = drm_mm_hole_node_start(hole);
- hole_end = drm_mm_hole_node_end(hole);
-
- adj_start = max(hole_start, scan->range_start);
- adj_end = min(hole_end, scan->range_end);
+ hole_start = __drm_mm_hole_node_start(hole);
+ hole_end = __drm_mm_hole_node_end(hole);

+ col_start = hole_start;
+ col_end = hole_end;
if (mm->color_adjust)
- mm->color_adjust(hole, scan->color, &adj_start, &adj_end);
+ mm->color_adjust(hole, scan->color, &col_start, &col_end);
+
+ adj_start = max(col_start, scan->range_start);
+ adj_end = min(col_end, scan->range_end);

if (check_free_hole(adj_start, adj_end,
scan->size, scan->alignment)) {
--
2.11.0

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