+ return ret;
+}
+
+/*
+ * hp_sw_tur - Send TEST UNIT READY
+ * @sdev: sdev command should be sent to
+ *
+ * Use the TEST UNIT READY command to determine
+ * the path state.
+ */
+static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
+{
+ struct request *req;
+ int ret;
+
+ req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO);
+ if (!req)
+ return SCSI_DH_RES_TEMP_UNAVAIL;
+
+ req->cmd_type = REQ_TYPE_BLOCK_PC;
+ req->cmd_flags |= REQ_FAILFAST;
+ req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY);
+ memset(req->cmd, 0, MAX_COMMAND_SIZE);
+ req->cmd[0] = TEST_UNIT_READY;
+ req->timeout = HP_SW_TIMEOUT;
+ req->sense = h->sense;
+ memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ req->sense_len = 0;
+
+retry:
+ ret = blk_execute_rq(req->q, NULL, req, 1);
+ if (ret == -EIO) {
+ if (req->sense_len > 0) {
+ ret = tur_done(sdev, h->sense);
+ } else {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: sending tur failed with %x\n",
+ HP_SW_NAME, req->errors);
+ ret = SCSI_DH_IO;
+ }
+ } else {
+ h->path_state = HP_SW_PATH_ACTIVE;
+ ret = SCSI_DH_OK;
+ }
+ if (ret == SCSI_DH_IMM_RETRY)
+ goto retry;
+ if (ret == SCSI_DH_DEV_OFFLINED) {
+ h->path_state = HP_SW_PATH_PASSIVE;
+ ret = SCSI_DH_OK;
+ }
+
+ blk_put_request(req);
+
+ return ret;
+}
+
+/*
+ * start_done - Handle START STOP UNIT return status
+ * @sdev: sdev the command has been sent to
+ * @errors: blk error code
+ */
+static int start_done(struct scsi_device *sdev, unsigned char *sense)
+{
+ struct scsi_sense_hdr sshdr;
+ int rc;
+
+ rc = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr);
+ if (!rc) {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: sending start_stop_unit failed, "
+ "no sense available\n",
+ HP_SW_NAME);
+ return SCSI_DH_IO;
+ }
+ switch (sshdr.sense_key) {
+ case NOT_READY:
+ if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) {
+ /*
+ * LUN not ready - manual intervention required
+ *
+ * Switch-over in progress, retry.
+ */
+ rc = SCSI_DH_RETRY;
+ break;
+ }
+ /* fall through */
+ default:
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: sending start_stop_unit failed, sense %x/%x/%x\n",
+ HP_SW_NAME, sshdr.sense_key, sshdr.asc,
+ sshdr.ascq);