RDMA/uverbs: Fill in the response for IB_USER_VERBS_EX_CMD_MODIFY_QP

A response struct was defined, and userspace is providing it (but not
checking it). Fill it in and write it out.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 7f8b0a7..c605412 100644 (file)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1953,6 +1953,9 @@ static int ib_uverbs_ex_modify_qp(struct uverbs_attr_bundle *attrs,
                                  struct ib_udata *ucore)
 {
        struct ib_uverbs_ex_modify_qp cmd;
+       struct ib_uverbs_ex_modify_qp_resp resp = {
+               .response_length = uverbs_response_length(attrs, sizeof(resp))
+       };
        int ret;
 
        ret = uverbs_request(attrs, &cmd, sizeof(cmd));
@@ -1969,7 +1972,11 @@ static int ib_uverbs_ex_modify_qp(struct uverbs_attr_bundle *attrs,
            ~((IB_USER_LAST_QP_ATTR_MASK << 1) - 1))
                return -EOPNOTSUPP;
 
-       return modify_qp(attrs, &cmd);
+       ret = modify_qp(attrs, &cmd);
+       if (ret)
+               return ret;
+
+       return uverbs_response(attrs, &resp, sizeof(resp));
 }
 
 static int ib_uverbs_destroy_qp(struct uverbs_attr_bundle *attrs,