From: Roland Dreier <rolandd@cisco.com>
Date: Mon, 21 May 2007 03:19:24 +0000 (-0700)
Subject: IB/mlx4: Check if SRQ is full when posting receive
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=56a8c8b6ac4d6edba5153d17730aaf96ba8f1f8c;p=deliverable%2Flinux.git

IB/mlx4: Check if SRQ is full when posting receive

Make mlx4_post_srq_recv() fail if the SRQ is full (head == tail).

Signed-off-by: Roland Dreier <rolandd@cisco.com>
---

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index 42ab4a801d6a..12fac1c8989d 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -297,6 +297,12 @@ int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 			break;
 		}
 
+		if (unlikely(srq->head == srq->tail)) {
+			err = -ENOMEM;
+			*bad_wr = wr;
+			break;
+		}
+
 		srq->wrid[srq->head] = wr->wr_id;
 
 		next      = get_wqe(srq, srq->head);