diff --git a/[refs] b/[refs]
index 1485221d6c49..232c5b6730e5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 13aa6ecb47990cfc78e20e347fdd3f1df6189426
+refs/heads/master: 4e56ea794ec8636991e21942fc2e0d071ea8ee1d
diff --git a/trunk/drivers/infiniband/hw/mthca/mthca_cq.c b/trunk/drivers/infiniband/hw/mthca/mthca_cq.c
index 205854e9c662..87a8f1166a3b 100644
--- a/trunk/drivers/infiniband/hw/mthca/mthca_cq.c
+++ b/trunk/drivers/infiniband/hw/mthca/mthca_cq.c
@@ -540,8 +540,17 @@ static inline int mthca_poll_one(struct mthca_dev *dev,
 		entry->wr_id = srq->wrid[wqe_index];
 		mthca_free_srq_wqe(srq, wqe);
 	} else {
+		s32 wqe;
 		wq = &(*cur_qp)->rq;
-		wqe_index = be32_to_cpu(cqe->wqe) >> wq->wqe_shift;
+		wqe = be32_to_cpu(cqe->wqe);
+		wqe_index = wqe >> wq->wqe_shift;
+               /*
+		* WQE addr == base - 1 might be reported in receive completion
+		* with error instead of (rq size - 1) by Sinai FW 1.0.800 and
+		* Arbel FW 5.1.400.  This bug should be fixed in later FW revs.
+		*/
+		if (unlikely(wqe_index < 0))
+			wqe_index = wq->max - 1;
 		entry->wr_id = (*cur_qp)->wrid[wqe_index];
 	}