Merge "Fix out-of-order transactions (2/2)" into oc-dr1-dev

1 files changed, 6 insertions, 4 deletions

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index a57e8cf3e4..2703db8e93 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2861,10 +2861,12 @@ void SurfaceFlinger::setTransactionState(
         }
     }
 
-    // If a synchronous transaction is explicitly requested without any changes,
-    // force a transaction anyway. This can be used as a flush mechanism for
-    // previous async transactions.
-    if (transactionFlags == 0 && (flags & eSynchronous)) {
+    // If a synchronous transaction is explicitly requested without any changes, force a transaction
+    // anyway. This can be used as a flush mechanism for previous async transactions.
+    // Empty animation transaction can be used to simulate back-pressure, so also force a
+    // transaction for empty animation transactions.
+    if (transactionFlags == 0 &&
+            ((flags & eSynchronous) || (flags & eAnimation))) {
         transactionFlags = eTransactionNeeded;
     }