diff --git a/[refs] b/[refs]
index 2c6cf452a4b9..5a88d1e49784 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c50331e8be32eaba5e1949f98c70d50b891262db
+refs/heads/master: ef560682a97491f62ef538931a4861b57d66c52c
diff --git a/trunk/include/linux/dmaengine.h b/trunk/include/linux/dmaengine.h
index c4a560e72ab7..34f124d7fb94 100644
--- a/trunk/include/linux/dmaengine.h
+++ b/trunk/include/linux/dmaengine.h
@@ -287,6 +287,11 @@ static inline void async_tx_ack(struct dma_async_tx_descriptor *tx)
 	tx->flags |= DMA_CTRL_ACK;
 }
 
+static inline void async_tx_clear_ack(struct dma_async_tx_descriptor *tx)
+{
+	tx->flags &= ~DMA_CTRL_ACK;
+}
+
 static inline bool async_tx_test_ack(struct dma_async_tx_descriptor *tx)
 {
 	return (tx->flags & DMA_CTRL_ACK) == DMA_CTRL_ACK;