Example #1
0
/*
 * 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)
{
	unsigned char cmd[6] = { TEST_UNIT_READY };
	struct scsi_sense_hdr sshdr;
	int ret = SCSI_DH_OK, res;
	u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
		REQ_FAILFAST_DRIVER;

retry:
	res = scsi_execute(sdev, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
			HP_SW_TIMEOUT, HP_SW_RETRIES, req_flags, 0, NULL);
	if (res) {
		if (scsi_sense_valid(&sshdr))
			ret = tur_done(sdev, h, &sshdr);
		else {
			sdev_printk(KERN_WARNING, sdev,
				    "%s: sending tur failed with %x\n",
				    HP_SW_NAME, res);
			ret = SCSI_DH_IO;
		}
	} else {
		h->path_state = HP_SW_PATH_ACTIVE;
		ret = SCSI_DH_OK;
	}
	if (ret == SCSI_DH_IMM_RETRY)
		goto retry;

	return ret;
}
Example #2
0
/*
 * 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;

retry:
	req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO);
	if (IS_ERR(req))
		return SCSI_DH_RES_TEMP_UNAVAIL;

	blk_rq_set_block_pc(req);
	req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
			  REQ_FAILFAST_DRIVER;
	req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY);
	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;

	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) {
		blk_put_request(req);
		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;
}