IB/rdmavt: Correct warning during QPN allocation

Correct calculation of the low order bits which should be unset
based on use of qos_shift parameter when assigning QPN.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Brian Welty <brian.welty@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c
index 7de5134..c3e0d61 100644 (file)
--- a/drivers/infiniband/sw/rdmavt/qp.c
+++ b/drivers/infiniband/sw/rdmavt/qp.c
@@ -369,8 +369,8 @@ static int alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
                        /* wrap to first map page, invert bit 0 */
                        offset = qpt->incr | ((offset & 1) ^ 1);
                }
-               /* there can be no bits at shift and below */
-               WARN_ON(offset & (rdi->dparms.qos_shift - 1));
+               /* there can be no set bits in low-order QoS bits */
+               WARN_ON(offset & (BIT(rdi->dparms.qos_shift) - 1));
                qpn = mk_qpn(qpt, map, offset);
        }