drm/nv50: fix iommu errors caused by device reading from address 0

[safe/jmp/linux-2.6] / drivers / gpu / drm / drm_mm.c

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index a5c2773..2ac074c 100644 (file)
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -358,7 +358,7 @@ struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
                if (entry->size >= size + wasted) {
                        if (!best_match)
                                return entry;
-                       if (size < best_size) {
+                       if (entry->size < best_size) {
                                best = entry;
                                best_size = entry->size;
                        }
@@ -405,10 +405,11 @@ struct drm_mm_node *drm_mm_search_free_in_range(const struct drm_mm *mm,
                                wasted += alignment - tmp;
                }
 
-               if (entry->size >= size + wasted) {
+               if (entry->size >= size + wasted &&
+                   (entry->start + wasted + size) <= end) {
                        if (!best_match)
                                return entry;
-                       if (size < best_size) {
+                       if (entry->size < best_size) {
                                best = entry;
                                best_size = entry->size;
                        }
@@ -469,6 +470,26 @@ void drm_mm_takedown(struct drm_mm * mm)
 }
 EXPORT_SYMBOL(drm_mm_takedown);
 
+void drm_mm_debug_table(struct drm_mm *mm, const char *prefix)
+{
+       struct drm_mm_node *entry;
+       int total_used = 0, total_free = 0, total = 0;
+
+       list_for_each_entry(entry, &mm->ml_entry, ml_entry) {
+               printk(KERN_DEBUG "%s 0x%08lx-0x%08lx: %8ld: %s\n",
+                       prefix, entry->start, entry->start + entry->size,
+                       entry->size, entry->free ? "free" : "used");
+               total += entry->size;
+               if (entry->free)
+                       total_free += entry->size;
+               else
+                       total_used += entry->size;
+       }
+       printk(KERN_DEBUG "%s total: %d, used %d free %d\n", prefix, total,
+               total_used, total_free);
+}
+EXPORT_SYMBOL(drm_mm_debug_table);
+
 #if defined(CONFIG_DEBUG_FS)
 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm)
 {