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drm/mm: Fix search for smallest hole satisfying constraints 

entry->size is the size of the node, not the size of the hole after it.
So the code would actually find the hole which can satisfy the
constraints and which is preceded by the smallest node, not the smallest
hole satisfying the constraints.

Reported-by: "Huang, FrankR" <FrankR.Huang@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Michel Dänzer 2014-03-19 17:37:14 +09:00 committed by Dave Airlie
parent 740c22ae51
commit 145bccd239
1 changed files with 8 additions and 4 deletions
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12
drivers/gpu/drm/drm_mm.c
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@ -423,6 +423,8 @@ static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
__drm_mm_for_each_hole(entry, mm, adj_start, adj_end,
flags & DRM_MM_SEARCH_BELOW) {
unsigned long hole_size = adj_end - adj_start;
if (mm->color_adjust) {
mm->color_adjust(entry, color, &adj_start, &adj_end);
if (adj_end <= adj_start)
@ -435,9 +437,9 @@ static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
if (!(flags & DRM_MM_SEARCH_BEST))
return entry;
if (entry->size < best_size) {
if (hole_size < best_size) {
best = entry;
best_size = entry->size;
best_size = hole_size;
}
}
@ -465,6 +467,8 @@ static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_
__drm_mm_for_each_hole(entry, mm, adj_start, adj_end,
flags & DRM_MM_SEARCH_BELOW) {
unsigned long hole_size = adj_end - adj_start;
if (adj_start < start)
adj_start = start;
if (adj_end > end)
@ -482,9 +486,9 @@ static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_
if (!(flags & DRM_MM_SEARCH_BEST))
return entry;
if (entry->size < best_size) {
if (hole_size < best_size) {
best = entry;
best_size = entry->size;
best_size = hole_size;
}
}