sync: add internal refcounting to fences
If a fence is released while a timeline that one of it's pts is on is being
signaled, it is possible for that fence to be deleted before it is signaled.
This patch adds a refcount for internal references such as signaled pt
processing.
Change-Id: Ie8605e6fd2ac026c207220a03d84e1c1078ec719
Signed-off-by: Erik Gilling <konkers@android.com>
Signed-off-by: Ajay Dudani <adudani@codeaurora.org>
diff --git a/include/linux/sync.h b/include/linux/sync.h
index 943f414..00c9bae 100644
--- a/include/linux/sync.h
+++ b/include/linux/sync.h
@@ -16,6 +16,7 @@
#include <linux/types.h>
#ifdef __KERNEL__
+#include <linux/kref.h>
#include <linux/ktime.h>
#include <linux/list.h>
#include <linux/spinlock.h>
@@ -109,6 +110,7 @@
* @parent: sync_timeline to which this sync_pt belongs
* @child_list: membership in sync_timeline.child_list_head
* @active_list: membership in sync_timeline.active_list_head
+ * @signaled_list: membership in temorary signaled_list on stack
* @fence: sync_fence to which the sync_pt belongs
* @pt_list: membership in sync_fence.pt_list_head
* @status: 1: signaled, 0:active, <0: error
@@ -120,6 +122,7 @@
struct list_head child_list;
struct list_head active_list;
+ struct list_head signaled_list;
struct sync_fence *fence;
struct list_head pt_list;
@@ -133,6 +136,7 @@
/**
* struct sync_fence - sync fence
* @file: file representing this fence
+ * @kref: referenace count on fence.
* @name: name of sync_fence. Useful for debugging
* @pt_list_head: list of sync_pts in ths fence. immutable once fence
* is created
@@ -145,6 +149,7 @@
*/
struct sync_fence {
struct file *file;
+ struct kref kref;
char name[32];
/* this list is immutable once the fence is created */