Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

[sfrench/cifs-2.6.git] / drivers / gpu / drm / drm_mm.c

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index c861d80fd779c68d6b4ce4af2c3b5191db8e3bbf..97dc5a4f0de42604463ac99a7a161c33b2d3550f 100644 (file)
--- 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);
        }
 }