[RFC 5/9] android/sync: Fix reversed sense of signaled fence

[John.C.Harrison@Intel.com]

From: Peter Lawthers <peter.lawthers@intel.com>

In the 3.14 kernel, a signaled fence was indicated by the status field
== 1. In 4.x, a status == 0 indicates signaled, status < 0 indicates error,
and status > 0 indicates active.

This patch wraps the check for a signaled fence in a function so that
callers no longer needs to know the underlying implementation.

v0.3: New patch for series.

Tracked-On: https://jira01.devtools.intel.com/browse/ACD-308
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Riley Andrews <riandrews@android.com>
Signed-off-by: Peter Lawthers <peter.lawthers@intel.com>
---
 drivers/android/sync.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/android/sync.h b/drivers/android/sync.h
index d57fa0a..75532d8 100644
--- a/drivers/android/sync.h
+++ b/drivers/android/sync.h
@@ -345,6 +345,27 @@ int sync_fence_cancel_async(struct sync_fence *fence,
  */
 int sync_fence_wait(struct sync_fence *fence, long timeout);
 
+/**
+ * sync_fence_is_signaled() - Return an indication if the fence is signaled
+ * @fence:	fence to check
+ *
+ * returns 1 if fence is signaled
+ * returns 0 if fence is not signaled
+ * returns < 0 if fence is in error state
+ */
+static inline int
+sync_fence_is_signaled(struct sync_fence *fence)
+{
+	int status;
+
+	status = atomic_read(&fence->status);
+	if (status == 0)
+		return 1;
+	if (status > 0)
+		return 0;
+	return status;
+}
+
 #ifdef CONFIG_DEBUG_FS
 
 void sync_timeline_debug_add(struct sync_timeline *obj);
-- 
1.9.1

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