static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
			       struct iscsi_task *task, char *data,
			       int datalen)
{
	struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
	struct iscsi_session *session = conn->session;
	struct scsi_cmnd *sc = task->sc;

	iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
	conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;

	sc->result = (DID_OK << 16) | rhdr->cmd_status;

	if (task->protected) {
		sector_t sector;
		u8 ascq;

		/**
		 * Transports that didn't implement check_protection
		 * callback but still published T10-PI support to scsi-mid
		 * deserve this BUG_ON.
		 **/
		BUG_ON(!session->tt->check_protection);

		ascq = session->tt->check_protection(task, &sector);
		if (ascq) {
			sc->result = DRIVER_SENSE << 24 |
				     SAM_STAT_CHECK_CONDITION;
			scsi_build_sense_buffer(1, sc->sense_buffer,
						ILLEGAL_REQUEST, 0x10, ascq);
			scsi_set_sense_information(sc->sense_buffer,
						   SCSI_SENSE_BUFFERSIZE,
						   sector);
			goto out;
		}
	}

	if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
		sc->result = DID_ERROR << 16;
		goto out;
	}

	if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
		uint16_t senselen;

		if (datalen < 2) {
invalid_datalen:
			iscsi_conn_printk(KERN_ERR,  conn,
					 "Got CHECK_CONDITION but invalid data "
					 "buffer size of %d\n", datalen);
			sc->result = DID_BAD_TARGET << 16;
			goto out;
		}

		senselen = get_unaligned_be16(data);
		if (datalen < senselen)
			goto invalid_datalen;

		memcpy(sc->sense_buffer, data + 2,
		       min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
		ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
				  min_t(uint16_t, senselen,
				  SCSI_SENSE_BUFFERSIZE));
	}

	if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
			   ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
		sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
	}

	if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
	                   ISCSI_FLAG_CMD_OVERFLOW)) {
		int res_count = be32_to_cpu(rhdr->residual_count);

		if (res_count > 0 &&
		    (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
		     res_count <= scsi_bufflen(sc)))
			/* write side for bidi or uni-io set_resid */
			scsi_set_resid(sc, res_count);
		else
			sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
	}
out:
	ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
			  sc, sc->result, task->itt);
	conn->scsirsp_pdus_cnt++;
	iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
}
static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
			       struct iscsi_task *task, char *data,
			       int datalen)
{
	struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
	struct iscsi_session *session = conn->session;
	struct scsi_cmnd *sc = task->sc;

	iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
	conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;

	sc->result = (DID_OK << 16) | rhdr->cmd_status;

	if (task->protected) {
		sector_t sector;
		u8 ascq;

		 
		BUG_ON(!session->tt->check_protection);

		ascq = session->tt->check_protection(task, &sector);
		if (ascq) {
			sc->result = DRIVER_SENSE << 24 |
				     SAM_STAT_CHECK_CONDITION;
			scsi_build_sense_buffer(1, sc->sense_buffer,
						ILLEGAL_REQUEST, 0x10, ascq);
			scsi_set_sense_information(sc->sense_buffer,
						   SCSI_SENSE_BUFFERSIZE,
						   sector);
			goto out;
		}
	}

	if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
		sc->result = DID_ERROR << 16;
		goto out;
	}

	if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
		uint16_t senselen;

		if (datalen < 2) {
invalid_datalen:
			iscsi_conn_printk(KERN_ERR,  conn,
					 "Got CHECK_CONDITION but invalid data "
					 "buffer size of %d\n", datalen);
			sc->result = DID_BAD_TARGET << 16;
			goto out;
		}

		senselen = get_unaligned_be16(data);
		if (datalen < senselen)
			goto invalid_datalen;

		memcpy(sc->sense_buffer, data + 2,
		       min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
		ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
				  min_t(uint16_t, senselen,
				  SCSI_SENSE_BUFFERSIZE));
	}

	if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
			   ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
		sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
	}

	if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
	                   ISCSI_FLAG_CMD_OVERFLOW)) {
		int res_count = be32_to_cpu(rhdr->residual_count);

		if (res_count > 0 &&
		    (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
		     res_count <= scsi_bufflen(sc)))
			 
			scsi_set_resid(sc, res_count);
		else
			sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
	}
out:
	ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
			  sc, sc->result, task->itt);
	conn->scsirsp_pdus_cnt++;
	iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
}