RDMA/mlx5: Add missing returned error check of mlx5_ib_dereg_mr

Fix the following smatch error:

drivers/infiniband/hw/mlx5/mr.c:1950 mlx5_ib_dereg_mr() error: uninitialized symbol 'rc'.

Fixes: e6fb246ccafb ("RDMA/mlx5: Consolidate MR destruction to mlx5_ib_dereg_mr()")
Link: https://lore.kernel.org/r/20210314082250.10143-1-leon@kernel.org
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 86ffc7e5ef960225ec91f0f04928be2f2cce7bbd..9dcb9fb4eeaa59f27b467cf721e02d72e68fb124 100644 (file)
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1946,7 +1946,7 @@ int mlx5_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
                        mr->mtt_mr = NULL;
                }
                if (mr->klm_mr) {
-                       mlx5_ib_dereg_mr(&mr->klm_mr->ibmr, NULL);
+                       rc = mlx5_ib_dereg_mr(&mr->klm_mr->ibmr, NULL);
                        if (rc)
                                return rc;
                        mr->klm_mr = NULL;