IB/iser: Decrement CQ's active QPs accounting when QP creation fails

When creating a connection QP we choose the least used CQ and inc the
number of active QPs on that. If we fail to create the QP, we need to
decrement the active QPs counter.
Reported-by: NRoi Dayan <roid@mellanox.com>
Signed-off-by: NSagi Grimberg <sagig@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NRoland Dreier <roland@purestorage.com>

drivers/infiniband/ulp/iser/iser_verbs.c

@@ -494,7 +494,11 @@ static int iser_create_ib_conn_res(struct ib_conn *ib_conn)
 	return ret;
 
 out_err:
+	mutex_lock(&ig.connlist_mutex);
+	ib_conn->comp->active_qps--;
+	mutex_unlock(&ig.connlist_mutex);
 	iser_err("unable to alloc mem or create resource, err %d\n", ret);
+
 	return ret;
 }