IB/mthca: Allow the QP state transition RESET->RESET

RESET->RESET is an allowed QP state transition, so mthca should handle
it correctly, by just returning success without involving the firmware.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c
index 224c93dd29e..71dc84bd425 100644
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/drivers/infiniband/hw/mthca/mthca_qp.c
@@ -573,6 +573,11 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask,
                 goto out;
         }
 
+        if (cur_state == new_state && cur_state == IB_QPS_RESET) {
+                err = 0;
+                goto out;
+        }
+
         if ((attr_mask & IB_QP_PKEY_INDEX) &&
              attr->pkey_index >= dev->limits.pkey_table_len) {
                 mthca_dbg(dev, "P_Key index (%u) too large. max is %d\n",