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-rw-r--r--drivers/gpu/drm/drm_mm.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index c861d80fd77..97dc5a4f0de 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -103,6 +103,11 @@ static struct drm_mm_node *drm_mm_kmalloc(struct drm_mm *mm, int atomic)
return child;
}
+/* drm_mm_pre_get() - pre allocate drm_mm_node structure
+ * drm_mm: memory manager struct we are pre-allocating for
+ *
+ * Returns 0 on success or -ENOMEM if allocation fails.
+ */
int drm_mm_pre_get(struct drm_mm *mm)
{
struct drm_mm_node *node;
@@ -253,12 +258,14 @@ void drm_mm_put_block(struct drm_mm_node *cur)
prev_node->size += next_node->size;
list_del(&next_node->ml_entry);
list_del(&next_node->fl_entry);
+ spin_lock(&mm->unused_lock);
if (mm->num_unused < MM_UNUSED_TARGET) {
list_add(&next_node->fl_entry,
&mm->unused_nodes);
++mm->num_unused;
} else
kfree(next_node);
+ spin_unlock(&mm->unused_lock);
} else {
next_node->size += cur->size;
next_node->start = cur->start;
@@ -271,11 +278,13 @@ void drm_mm_put_block(struct drm_mm_node *cur)
list_add(&cur->fl_entry, &mm->fl_entry);
} else {
list_del(&cur->ml_entry);
+ spin_lock(&mm->unused_lock);
if (mm->num_unused < MM_UNUSED_TARGET) {
list_add(&cur->fl_entry, &mm->unused_nodes);
++mm->num_unused;
} else
kfree(cur);
+ spin_unlock(&mm->unused_lock);
}
}