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
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