IB/mthca: Fix SRQ limit event range check

Mem-free HCAs always keep one spare SRQ WQE, so the SRQ limit cannot
be set beyond srq->max - 1.

Signed-off-by: Dotan Barak <dotanb@mellanox.co.il>
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index fab417c..b60a9d7 100644 (file)
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -370,7 +370,8 @@ int mthca_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
                return -EINVAL;
 
        if (attr_mask & IB_SRQ_LIMIT) {
-               if (attr->srq_limit > srq->max)
+               u32 max_wr = mthca_is_memfree(dev) ? srq->max - 1 : srq->max;
+               if (attr->srq_limit > max_wr)
                        return -EINVAL;
 
                mutex_lock(&srq->mutex);