This helper tests whether a given node is currently linked into a drm_mm
manager. We use the node->mm pointer for that as it is set for all linked
objects.
We also reset node->mm whenever a node is removed. All such access is
currently safe as everyone calls kfree() on the object directly after
removing it. Furthermore, no-one is supposed to access node->mm from
outside drm_mm.c, anyway.
Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxx>
---
drivers/gpu/drm/drm_mm.c | 1 +
include/drm/drm_mm.h | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 7917729..3bd43ce 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -374,6 +374,7 @@ void drm_mm_remove_node(struct drm_mm_node *node)
list_del(&node->node_list);
node->allocated = 0;
+ node->mm = NULL;
}
EXPORT_SYMBOL(drm_mm_remove_node);
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index de92425..d83b966 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -85,6 +85,11 @@ static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
return node->allocated;
}
+static inline bool drm_mm_node_linked(struct drm_mm_node *node)
+{
+ return node->mm;
+}
+
static inline bool drm_mm_initialized(struct drm_mm *mm)
{
return mm->hole_stack.next;
--
1.8.3.2
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel
