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-rw-r--r--drivers/gpu/drm/drm_mm.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index da99edc50888..a6bfc302ed90 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -285,21 +285,21 @@ void drm_mm_put_block(struct drm_mm_node *cur)
EXPORT_SYMBOL(drm_mm_put_block);
-static int check_free_mm_node(struct drm_mm_node *entry, unsigned long size,
- unsigned alignment)
+static int check_free_hole(unsigned long start, unsigned long end,
+ unsigned long size, unsigned alignment)
{
unsigned wasted = 0;
- if (entry->size < size)
+ if (end - start < size)
return 0;
if (alignment) {
- register unsigned tmp = entry->start % alignment;
+ unsigned tmp = start % alignment;
if (tmp)
wasted = alignment - tmp;
}
- if (entry->size >= size + wasted) {
+ if (end >= start + size + wasted) {
return 1;
}
@@ -320,7 +320,8 @@ struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
best_size = ~0UL;
list_for_each_entry(entry, &mm->free_stack, free_stack) {
- if (!check_free_mm_node(entry, size, alignment))
+ if (!check_free_hole(entry->start, entry->start + entry->size,
+ size, alignment))
continue;
if (!best_match)
@@ -353,10 +354,12 @@ struct drm_mm_node *drm_mm_search_free_in_range(const struct drm_mm *mm,
best_size = ~0UL;
list_for_each_entry(entry, &mm->free_stack, free_stack) {
- if (entry->start > end || (entry->start+entry->size) < start)
- continue;
+ unsigned long adj_start = entry->start < start ?
+ start : entry->start;
+ unsigned long adj_end = entry->start + entry->size > end ?
+ end : entry->start + entry->size;
- if (!check_free_mm_node(entry, size, alignment))
+ if (!check_free_hole(adj_start, adj_end, size, alignment))
continue;
if (!best_match)
@@ -449,7 +452,8 @@ int drm_mm_scan_add_block(struct drm_mm_node *node)
node->free_stack.prev = prev_free;
node->free_stack.next = next_free;
- if (check_free_mm_node(node, mm->scan_size, mm->scan_alignment)) {
+ if (check_free_hole(node->start, node->start + node->size,
+ mm->scan_size, mm->scan_alignment)) {
mm->scan_hit_start = node->start;
mm->scan_hit_size = node->size;