ibmvscsis: Initial commit of IBM VSCSI Tgt Driver

Hello Bryant G. Ly,

The patch 88a678bbc34c: "ibmvscsis: Initial commit of IBM VSCSI Tgt Driver" from Jun 28, 2016, leads to the following static checker warning:

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:1981 ibmvscsis_srp_login()
warn: suspicious bitop condition

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

  1967          iport = (struct port_id *)req->initiator_port_id;
  1968          tport = (struct port_id *)req->target_port_id;
  1969          fmt = (struct format_code *)&req->req_buf_fmt;
  1970          if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN)
  1971                  reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE;
  1972          else if (be32_to_cpu(req->req_it_iu_len) < 64)
  1973                  reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
  1974          else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) ||
  1975                   (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1)))
  1976                  reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL;
  1977          else if (req->req_flags & SRP_MULTICHAN_MULTI)
  1978                  reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED;
  1979          else if (fmt->buffers & (~SUPPORTED_FORMATS))
  1980                  reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
  1981          else if ((fmt->buffers | SUPPORTED_FORMATS) == 0)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

SUPPORTED_FORMATS is 1 << 1 so it's never zero.

  1982                  reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
  1983  
  1984          if (vscsi->state == SRP_PROCESSING)
  1985                  reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED;
  1986  

regards,
dan carpenter