C++ scsi_bufflen函数代码示例

static int idescsi_queue (struct scsi_cmnd *cmd,
		void (*done)(struct scsi_cmnd *))
{
	struct Scsi_Host *host = cmd->device->host;
	idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
	ide_drive_t *drive = scsi->drive;
	struct request *rq = NULL;
	struct ide_atapi_pc *pc = NULL;
	int write = cmd->sc_data_direction == DMA_TO_DEVICE;

	if (!drive) {
		scmd_printk (KERN_ERR, cmd, "drive not present\n");
		goto abort;
	}
	scsi = drive_to_idescsi(drive);
	pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
	rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
	if (rq == NULL || pc == NULL) {
		printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
		goto abort;
	}

	memset (pc->c, 0, 12);
	pc->flags = 0;
	if (cmd->sc_data_direction == DMA_TO_DEVICE)
		pc->flags |= PC_FLAG_WRITING;
	pc->rq = rq;
	memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
	pc->buf = NULL;
	pc->sg = scsi_sglist(cmd);
	pc->sg_cnt = scsi_sg_count(cmd);
	pc->b_count = 0;
	pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
	pc->scsi_cmd = cmd;
	pc->done = done;
	pc->timeout = jiffies + cmd->timeout_per_command;

	if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
		printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
		ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
		if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
			printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
			ide_scsi_hex_dump(pc->c, 12);
		}
	}

	rq->special = (char *) pc;
	rq->cmd_type = REQ_TYPE_SPECIAL;
	spin_unlock_irq(host->host_lock);
	rq->ref_count++;
	memcpy(rq->cmd, pc->c, 12);
	blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
	spin_lock_irq(host->host_lock);
	return 0;
abort:
	kfree (pc);
	if (rq)
		blk_put_request(rq);
	cmd->result = DID_ERROR << 16;
	done(cmd);
	return 0;
}

//.........这里部分代码省略.........

        /* The Freecom device will only fail if there is something
         * wrong in USB land.  It returns the status in its own
         * registers, which come back in the bulk pipe.
         */
        if (result != USB_STOR_XFER_GOOD) {
            usb_stor_dbg(us, "freecom transport error\n");
            return USB_STOR_TRANSPORT_ERROR;
        }

        /* get the data */
        result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
                                             FCM_STATUS_PACKET_LENGTH, &partial);

        usb_stor_dbg(us, "bar Status result %d %u\n", result, partial);
        if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

        US_DEBUG(pdump(us, (void *)fst, partial));
    }

    if (partial != 4)
        return USB_STOR_TRANSPORT_ERROR;
    if ((fst->Status & 1) != 0) {
        usb_stor_dbg(us, "operation failed\n");
        return USB_STOR_TRANSPORT_FAILED;
    }

    /* The device might not have as much data available as we
     * requested.  If you ask for more than the device has, this reads
     * and such will hang. */
    usb_stor_dbg(us, "Device indicates that it has %d bytes available\n",
                 le16_to_cpu(fst->Count));
    usb_stor_dbg(us, "SCSI requested %d\n", scsi_bufflen(srb));

    /* Find the length we desire to read. */
    switch (srb->cmnd[0]) {
    case INQUIRY:
    case REQUEST_SENSE:	/* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
    case MODE_SENSE:
    case MODE_SENSE_10:
        length = le16_to_cpu(fst->Count);
        break;
    default:
        length = scsi_bufflen(srb);
    }

    /* verify that this amount is legal */
    if (length > scsi_bufflen(srb)) {
        length = scsi_bufflen(srb);
        usb_stor_dbg(us, "Truncating request to match buffer length: %d\n",
                     length);
    }

    /* What we do now depends on what direction the data is supposed to
     * move in. */

    switch (us->srb->sc_data_direction) {
    case DMA_FROM_DEVICE:
        /* catch bogus "read 0 length" case */
        if (!length)
            break;
        /* Make sure that the status indicates that the device
         * wants data as well. */
        if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
            usb_stor_dbg(us, "SCSI wants data, drive doesn't have any\n");

/**
 * iser_send_command - send command PDU
 */
int iser_send_command(struct iscsi_conn *conn,
		      struct iscsi_task *task)
{
	struct iser_conn *iser_conn = conn->dd_data;
	struct iscsi_iser_task *iser_task = task->dd_data;
	unsigned long edtl;
	int err;
	struct iser_data_buf *data_buf, *prot_buf;
	struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
	struct scsi_cmnd *sc  =  task->sc;
	struct iser_tx_desc *tx_desc = &iser_task->desc;
	u8 sig_count = ++iser_conn->ib_conn.sig_count;

	edtl = ntohl(hdr->data_length);

	/* build the tx desc regd header and add it to the tx desc dto */
	tx_desc->type = ISCSI_TX_SCSI_COMMAND;
	tx_desc->cqe.done = iser_cmd_comp;
	iser_create_send_desc(iser_conn, tx_desc);

	if (hdr->flags & ISCSI_FLAG_CMD_READ) {
		data_buf = &iser_task->data[ISER_DIR_IN];
		prot_buf = &iser_task->prot[ISER_DIR_IN];
	} else {
		data_buf = &iser_task->data[ISER_DIR_OUT];
		prot_buf = &iser_task->prot[ISER_DIR_OUT];
	}

	if (scsi_sg_count(sc)) { /* using a scatter list */
		data_buf->sg = scsi_sglist(sc);
		data_buf->size = scsi_sg_count(sc);
	}
	data_buf->data_len = scsi_bufflen(sc);

	if (scsi_prot_sg_count(sc)) {
		prot_buf->sg  = scsi_prot_sglist(sc);
		prot_buf->size = scsi_prot_sg_count(sc);
		prot_buf->data_len = (data_buf->data_len >>
				     ilog2(sc->device->sector_size)) * 8;
	}

	if (hdr->flags & ISCSI_FLAG_CMD_READ) {
		err = iser_prepare_read_cmd(task);
		if (err)
			goto send_command_error;
	}
	if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
		err = iser_prepare_write_cmd(task,
					     task->imm_count,
				             task->imm_count +
					     task->unsol_r2t.data_length,
					     edtl);
		if (err)
			goto send_command_error;
	}

	iser_task->status = ISER_TASK_STATUS_STARTED;

	err = iser_post_send(&iser_conn->ib_conn, tx_desc,
			     iser_signal_comp(sig_count));
	if (!err)
		return 0;

send_command_error:
	iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
	return err;
}

//.........这里部分代码省略.........
		/* If the sense data returned is larger than 18-bytes then we
		 * assume this device supports requesting more in the future.
		 * The response code must be 70h through 73h inclusive.
		 */
		if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) &&
		    !(us->fflags & US_FL_SANE_SENSE) &&
		    !(us->fflags & US_FL_BAD_SENSE) &&
		    (srb->sense_buffer[0] & 0x7C) == 0x70) {
			US_DEBUGP("-- SANE_SENSE support enabled\n");
			us->fflags |= US_FL_SANE_SENSE;

			/* Indicate to the user that we truncated their sense
			 * because we didn't know it supported larger sense.
			 */
			US_DEBUGP("-- Sense data truncated to %i from %i\n",
			          US_SENSE_SIZE,
			          srb->sense_buffer[7] + 8);
			srb->sense_buffer[7] = (US_SENSE_SIZE - 8);
		}

		US_DEBUGP("-- Result from auto-sense is %d\n", temp_result);
		US_DEBUGP("-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n",
			  srb->sense_buffer[0],
			  srb->sense_buffer[2] & 0xf,
			  srb->sense_buffer[12], 
			  srb->sense_buffer[13]);
#ifdef CONFIG_USB_STORAGE_DEBUG
		usb_stor_show_sense(
			  srb->sense_buffer[2] & 0xf,
			  srb->sense_buffer[12], 
			  srb->sense_buffer[13]);
#endif

		/* set the result so the higher layers expect this data */
		srb->result = SAM_STAT_CHECK_CONDITION;

		/* We often get empty sense data.  This could indicate that
		 * everything worked or that there was an unspecified
		 * problem.  We have to decide which.
		 */
		if (	/* Filemark 0, ignore EOM, ILI 0, no sense */
				(srb->sense_buffer[2] & 0xaf) == 0 &&
			/* No ASC or ASCQ */
				srb->sense_buffer[12] == 0 &&
				srb->sense_buffer[13] == 0) {

			/* If things are really okay, then let's show that.
			 * Zero out the sense buffer so the higher layers
			 * won't realize we did an unsolicited auto-sense.
			 */
			if (result == USB_STOR_TRANSPORT_GOOD) {
				srb->result = SAM_STAT_GOOD;
				srb->sense_buffer[0] = 0x0;

			/* If there was a problem, report an unspecified
			 * hardware error to prevent the higher layers from
			 * entering an infinite retry loop.
			 */
			} else {
				srb->result = DID_ERROR << 16;
				srb->sense_buffer[2] = HARDWARE_ERROR;
			}
		}
	}

	/* Did we transfer less than the minimum amount required? */
	if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) &&
			scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)
		srb->result = DID_ERROR << 16;

	last_sector_hacks(us, srb);
	return;

	/* Error and abort processing: try to resynchronize with the device
	 * by issuing a port reset.  If that fails, try a class-specific
	 * device reset. */
  Handle_Errors:

	/* Set the RESETTING bit, and clear the ABORTING bit so that
	 * the reset may proceed. */
	scsi_lock(us_to_host(us));
	set_bit(US_FLIDX_RESETTING, &us->dflags);
	clear_bit(US_FLIDX_ABORTING, &us->dflags);
	scsi_unlock(us_to_host(us));

	/* We must release the device lock because the pre_reset routine
	 * will want to acquire it. */
	mutex_unlock(&us->dev_mutex);
	result = usb_stor_port_reset(us);
	mutex_lock(&us->dev_mutex);

	if (result < 0) {
		scsi_lock(us_to_host(us));
		usb_stor_report_device_reset(us);
		scsi_unlock(us_to_host(us));
		us->transport_reset(us);
	}
	clear_bit(US_FLIDX_RESETTING, &us->dflags);
	last_sector_hacks(us, srb);
}

/*
 * Pull a completion descriptor off and pass the completion back
 * to the SCSI mid layer.
 */
static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
				    const struct PVSCSIRingCmpDesc *e)
{
	struct pvscsi_ctx *ctx;
	struct scsi_cmnd *cmd;
	u32 btstat = e->hostStatus;
	u32 sdstat = e->scsiStatus;

	ctx = pvscsi_get_context(adapter, e->context);
	cmd = ctx->cmd;
	pvscsi_unmap_buffers(adapter, ctx);
	pvscsi_release_context(adapter, ctx);
	cmd->result = 0;

	if (sdstat != SAM_STAT_GOOD &&
	    (btstat == BTSTAT_SUCCESS ||
	     btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
	     btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
		cmd->result = (DID_OK << 16) | sdstat;
		if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer)
			cmd->result |= (DRIVER_SENSE << 24);
	} else
		switch (btstat) {
		case BTSTAT_SUCCESS:
		case BTSTAT_LINKED_COMMAND_COMPLETED:
		case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG:
			/* If everything went fine, let's move on..  */
			cmd->result = (DID_OK << 16);
			break;

		case BTSTAT_DATARUN:
		case BTSTAT_DATA_UNDERRUN:
			/* Report residual data in underruns */
			scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
			cmd->result = (DID_ERROR << 16);
			break;

		case BTSTAT_SELTIMEO:
			/* Our emulation returns this for non-connected devs */
			cmd->result = (DID_BAD_TARGET << 16);
			break;

		case BTSTAT_LUNMISMATCH:
		case BTSTAT_TAGREJECT:
		case BTSTAT_BADMSG:
			cmd->result = (DRIVER_INVALID << 24);
			/* fall through */

		case BTSTAT_HAHARDWARE:
		case BTSTAT_INVPHASE:
		case BTSTAT_HATIMEOUT:
		case BTSTAT_NORESPONSE:
		case BTSTAT_DISCONNECT:
		case BTSTAT_HASOFTWARE:
		case BTSTAT_BUSFREE:
		case BTSTAT_SENSFAILED:
			cmd->result |= (DID_ERROR << 16);
			break;

		case BTSTAT_SENTRST:
		case BTSTAT_RECVRST:
		case BTSTAT_BUSRESET:
			cmd->result = (DID_RESET << 16);
			break;

		case BTSTAT_ABORTQUEUE:
			cmd->result = (DID_ABORT << 16);
			break;

		case BTSTAT_SCSIPARITY:
			cmd->result = (DID_PARITY << 16);
			break;

		default:
			cmd->result = (DID_ERROR << 16);
			scmd_printk(KERN_DEBUG, cmd,
				    "Unknown completion status: 0x%x\n",
				    btstat);
	}

	dev_dbg(&cmd->device->sdev_gendev,
		"cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n",
		cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat);

	cmd->scsi_done(cmd);
}

/*
 * Allocate a tcm_loop cmd descriptor from target_core_mod code
 *
 * Can be called from interrupt context in tcm_loop_queuecommand() below
 */
static struct se_cmd *tcm_loop_allocate_core_cmd(
	struct tcm_loop_hba *tl_hba,
	struct se_portal_group *se_tpg,
	struct scsi_cmnd *sc)
{
	struct se_cmd *se_cmd;
	struct se_session *se_sess;
	struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus;
	struct tcm_loop_cmd *tl_cmd;
	int sam_task_attr;

	if (!tl_nexus) {
		scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
				" does not exist\n");
		set_host_byte(sc, DID_ERROR);
		return NULL;
	}
	se_sess = tl_nexus->se_sess;

	tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
	if (!tl_cmd) {
		pr_err("Unable to allocate struct tcm_loop_cmd\n");
		set_host_byte(sc, DID_ERROR);
		return NULL;
	}
	se_cmd = &tl_cmd->tl_se_cmd;
	/*
	 * Save the pointer to struct scsi_cmnd *sc
	 */
	tl_cmd->sc = sc;
	/*
	 * Locate the SAM Task Attr from struct scsi_cmnd *
	 */
	if (sc->device->tagged_supported) {
		switch (sc->tag) {
		case HEAD_OF_QUEUE_TAG:
			sam_task_attr = MSG_HEAD_TAG;
			break;
		case ORDERED_QUEUE_TAG:
			sam_task_attr = MSG_ORDERED_TAG;
			break;
		default:
			sam_task_attr = MSG_SIMPLE_TAG;
			break;
		}
	} else
		sam_task_attr = MSG_SIMPLE_TAG;

	/*
	 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
	 */
	transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
			scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr,
			&tl_cmd->tl_sense_buf[0]);

	/*
	 * Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi
	 */
	if (scsi_bidi_cmnd(sc))
		se_cmd->t_tasks_bidi = 1;
	/*
	 * Locate the struct se_lun pointer and attach it to struct se_cmd
	 */
	if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) {
		kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
		set_host_byte(sc, DID_NO_CONNECT);
		return NULL;
	}

	return se_cmd;
}

static int nsp_queuecommand_lck(struct scsi_cmnd *SCpnt,
			    void (*done)(struct scsi_cmnd *))
{
#ifdef NSP_DEBUG
	/*unsigned int host_id = SCpnt->device->host->this_id;*/
	/*unsigned int base    = SCpnt->device->host->io_port;*/
	unsigned char target = scmd_id(SCpnt);
#endif
	nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;

	nsp_dbg(NSP_DEBUG_QUEUECOMMAND,
		"SCpnt=0x%p target=%d lun=%d sglist=0x%p bufflen=%d sg_count=%d",
		SCpnt, target, SCpnt->device->lun, scsi_sglist(SCpnt),
		scsi_bufflen(SCpnt), scsi_sg_count(SCpnt));
	//nsp_dbg(NSP_DEBUG_QUEUECOMMAND, "before CurrentSC=0x%p", data->CurrentSC);

	SCpnt->scsi_done	= done;

	if (data->CurrentSC != NULL) {
		nsp_msg(KERN_DEBUG, "CurrentSC!=NULL this can't be happen");
		SCpnt->result   = DID_BAD_TARGET << 16;
		nsp_scsi_done(SCpnt);
		return 0;
	}

#if 0
	/* XXX: pcmcia-cs generates SCSI command with "scsi_info" utility.
	        This makes kernel crash when suspending... */
	if (data->ScsiInfo->stop != 0) {
		nsp_msg(KERN_INFO, "suspending device. reject command.");
		SCpnt->result  = DID_BAD_TARGET << 16;
		nsp_scsi_done(SCpnt);
		return SCSI_MLQUEUE_HOST_BUSY;
	}
#endif

	show_command(SCpnt);

	data->CurrentSC		= SCpnt;

	SCpnt->SCp.Status	= CHECK_CONDITION;
	SCpnt->SCp.Message	= 0;
	SCpnt->SCp.have_data_in = IO_UNKNOWN;
	SCpnt->SCp.sent_command = 0;
	SCpnt->SCp.phase	= PH_UNDETERMINED;
	scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));

	/* setup scratch area
	   SCp.ptr		: buffer pointer
	   SCp.this_residual	: buffer length
	   SCp.buffer		: next buffer
	   SCp.buffers_residual : left buffers in list
	   SCp.phase		: current state of the command */
	if (scsi_bufflen(SCpnt)) {
		SCpnt->SCp.buffer	    = scsi_sglist(SCpnt);
		SCpnt->SCp.ptr		    = BUFFER_ADDR;
		SCpnt->SCp.this_residual    = SCpnt->SCp.buffer->length;
		SCpnt->SCp.buffers_residual = scsi_sg_count(SCpnt) - 1;
	} else {
		SCpnt->SCp.ptr		    = NULL;
		SCpnt->SCp.this_residual    = 0;
		SCpnt->SCp.buffer	    = NULL;
		SCpnt->SCp.buffers_residual = 0;
	}

	if (nsphw_start_selection(SCpnt) == FALSE) {
		nsp_dbg(NSP_DEBUG_QUEUECOMMAND, "selection fail");
		SCpnt->result   = DID_BUS_BUSY << 16;
		nsp_scsi_done(SCpnt);
		return 0;
	}


	//nsp_dbg(NSP_DEBUG_QUEUECOMMAND, "out");
#ifdef NSP_DEBUG
	data->CmdId++;
#endif
	return 0;
}

//----- usb_stor_Bulk_transport() ---------------------
int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
	struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf;
	unsigned int transfer_length = scsi_bufflen(srb);
	unsigned int residue;
	int result;
	int fake_sense = 0;
	unsigned int cswlen;
	unsigned int cbwlen = US_BULK_CB_WRAP_LEN;

	//printk("transport --- usb_stor_Bulk_transport\n");
	/* Take care of BULK32 devices; set extra byte to 0 */
	if (unlikely(us->fflags & US_FL_BULK32))
	{
		cbwlen = 32;
		us->iobuf[31] = 0;
	}

	/* set up the command wrapper */
	bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
	bcb->DataTransferLength = cpu_to_le32(transfer_length);
	bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? 1 << 7 : 0;
	bcb->Tag = ++us->tag;
	bcb->Lun = srb->device->lun;
	if (us->fflags & US_FL_SCM_MULT_TARG)
		bcb->Lun |= srb->device->id << 4;
	bcb->Length = srb->cmd_len;

	/* copy the command payload */
	memset(bcb->CDB, 0, sizeof(bcb->CDB));
	memcpy(bcb->CDB, srb->cmnd, bcb->Length);

	// send command
	/* send it to out endpoint */
	/*printk("Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n",
			le32_to_cpu(bcb->Signature), bcb->Tag,
			le32_to_cpu(bcb->DataTransferLength), bcb->Flags,
			(bcb->Lun >> 4), (bcb->Lun & 0x0F),
			bcb->Length);*/
	result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb, cbwlen, NULL);
	//printk("Bulk command transfer result=%d\n", result);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	if (unlikely(us->fflags & US_FL_GO_SLOW))
		udelay(125);

	// R/W data
	if (transfer_length)
	{
		unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? us->recv_bulk_pipe : us->send_bulk_pipe;
		result = usb_stor_bulk_srb(us, pipe, srb);
		//printk("Bulk data transfer result 0x%x\n", result);
		if (result == USB_STOR_XFER_ERROR)
			return USB_STOR_TRANSPORT_ERROR;

		if (result == USB_STOR_XFER_LONG)
			fake_sense = 1;
	}

	/* get CSW for device status */
	//printk("Attempting to get CSW...\n");
	result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs, US_BULK_CS_WRAP_LEN, &cswlen);

	if (result == USB_STOR_XFER_SHORT && cswlen == 0)
	{
		//printk("Received 0-length CSW; retrying...\n");
		result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs, US_BULK_CS_WRAP_LEN, &cswlen);
	}

	/* did the attempt to read the CSW fail? */
	if (result == USB_STOR_XFER_STALLED)
	{
		/* get the status again */
		//printk("Attempting to get CSW (2nd try)...\n");
		result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs, US_BULK_CS_WRAP_LEN, NULL);
	}

	/* if we still have a failure at this point, we're in trouble */
	//printk("Bulk status result = %d\n", result);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	/* check bulk status */
	residue = le32_to_cpu(bcs->Residue);
	//printk("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n", le32_to_cpu(bcs->Signature), bcs->Tag, residue, bcs->Status);
	if (!(bcs->Tag == us->tag || (us->fflags & US_FL_BULK_IGNORE_TAG)) || bcs->Status > US_BULK_STAT_PHASE)
	{
		//printk("Bulk logical error\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	if (!us->bcs_signature)
	{
		us->bcs_signature = bcs->Signature;
		//if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN))
		//	printk("Learnt BCS signature 0x%08X\n", le32_to_cpu(us->bcs_signature));
	}
//.........这里部分代码省略.........

//.........这里部分代码省略.........

		US_DEBUGP("Issuing auto-REQUEST_SENSE\n");

		scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE);

		/* FIXME: we must do the protocol translation here */
		if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI ||
				us->subclass == US_SC_CYP_ATACB)
			srb->cmd_len = 6;
		else
			srb->cmd_len = 12;

		/* issue the auto-sense command */
		scsi_set_resid(srb, 0);
		temp_result = us->transport(us->srb, us);

		/* let's clean up right away */
		scsi_eh_restore_cmnd(srb, &ses);

		if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
			US_DEBUGP("-- auto-sense aborted\n");
			srb->result = DID_ABORT << 16;
			goto Handle_Errors;
		}
		if (temp_result != USB_STOR_TRANSPORT_GOOD) {
			US_DEBUGP("-- auto-sense failure\n");

			/* we skip the reset if this happens to be a
			 * multi-target device, since failure of an
			 * auto-sense is perfectly valid
			 */
			srb->result = DID_ERROR << 16;
			if (!(us->flags & US_FL_SCM_MULT_TARG))
				goto Handle_Errors;
			return;
		}

		US_DEBUGP("-- Result from auto-sense is %d\n", temp_result);
		US_DEBUGP("-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n",
			  srb->sense_buffer[0],
			  srb->sense_buffer[2] & 0xf,
			  srb->sense_buffer[12], 
			  srb->sense_buffer[13]);
#ifdef CONFIG_USB_STORAGE_DEBUG
		usb_stor_show_sense(
			  srb->sense_buffer[2] & 0xf,
			  srb->sense_buffer[12], 
			  srb->sense_buffer[13]);
#endif

		/* set the result so the higher layers expect this data */
		srb->result = SAM_STAT_CHECK_CONDITION;

		/* If things are really okay, then let's show that.  Zero
		 * out the sense buffer so the higher layers won't realize
		 * we did an unsolicited auto-sense. */
		if (result == USB_STOR_TRANSPORT_GOOD &&
			/* Filemark 0, ignore EOM, ILI 0, no sense */
				(srb->sense_buffer[2] & 0xaf) == 0 &&
			/* No ASC or ASCQ */
				srb->sense_buffer[12] == 0 &&
				srb->sense_buffer[13] == 0) {
			srb->result = SAM_STAT_GOOD;
			srb->sense_buffer[0] = 0x0;
		}
	}

	/* Did we transfer less than the minimum amount required? */
	if (srb->result == SAM_STAT_GOOD &&
			scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)
		srb->result = (DID_ERROR << 16) | (SUGGEST_RETRY << 24);

	return;

	/* Error and abort processing: try to resynchronize with the device
	 * by issuing a port reset.  If that fails, try a class-specific
	 * device reset. */
  Handle_Errors:

	/* Set the RESETTING bit, and clear the ABORTING bit so that
	 * the reset may proceed. */
	scsi_lock(us_to_host(us));
	set_bit(US_FLIDX_RESETTING, &us->flags);
	clear_bit(US_FLIDX_ABORTING, &us->flags);
	scsi_unlock(us_to_host(us));

	/* We must release the device lock because the pre_reset routine
	 * will want to acquire it. */
	mutex_unlock(&us->dev_mutex);
	result = usb_stor_port_reset(us);
	mutex_lock(&us->dev_mutex);

	if (result < 0) {
		scsi_lock(us_to_host(us));
		usb_stor_report_device_reset(us);
		scsi_unlock(us_to_host(us));
		us->transport_reset(us);
	}
	clear_bit(US_FLIDX_RESETTING, &us->flags);
}

static int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	struct freecom_cb_wrap *fcb;
	struct freecom_status  *fst;
	unsigned int ipipe, opipe;		
	int result;
	unsigned int partial;
	int length;

	fcb = (struct freecom_cb_wrap *) us->iobuf;
	fst = (struct freecom_status *) us->iobuf;

	US_DEBUGP("Freecom TRANSPORT STARTED\n");

	
	opipe = us->send_bulk_pipe;
	ipipe = us->recv_bulk_pipe;

	
	fcb->Type = FCM_PACKET_ATAPI | 0x00;
	fcb->Timeout = 0;
	memcpy (fcb->Atapi, srb->cmnd, 12);
	memset (fcb->Filler, 0, sizeof (fcb->Filler));

	US_DEBUG(pdump (srb->cmnd, 12));

	
	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
			FCM_PACKET_LENGTH, NULL);

	if (result != USB_STOR_XFER_GOOD) {
		US_DEBUGP ("freecom transport error\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
			FCM_STATUS_PACKET_LENGTH, &partial);
	US_DEBUGP("foo Status result %d %u\n", result, partial);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	US_DEBUG(pdump ((void *) fst, partial));

	while (fst->Status & FCM_STATUS_BUSY) {
		US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
		US_DEBUGP("fst->Status is %x\n", fst->Status);

		
		fcb->Type = FCM_PACKET_STATUS;
		fcb->Timeout = 0;
		memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
		memset (fcb->Filler, 0, sizeof (fcb->Filler));

		
		result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
				FCM_PACKET_LENGTH, NULL);

		if (result != USB_STOR_XFER_GOOD) {
			US_DEBUGP ("freecom transport error\n");
			return USB_STOR_TRANSPORT_ERROR;
		}

		
		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
				FCM_STATUS_PACKET_LENGTH, &partial);

		US_DEBUGP("bar Status result %d %u\n", result, partial);
		if (result != USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		US_DEBUG(pdump ((void *) fst, partial));
	}

	if (partial != 4)
		return USB_STOR_TRANSPORT_ERROR;
	if ((fst->Status & 1) != 0) {
		US_DEBUGP("operation failed\n");
		return USB_STOR_TRANSPORT_FAILED;
	}

	US_DEBUGP("Device indicates that it has %d bytes available\n",
			le16_to_cpu (fst->Count));
	US_DEBUGP("SCSI requested %d\n", scsi_bufflen(srb));

	
	switch (srb->cmnd[0]) {
	case INQUIRY:
	case REQUEST_SENSE:	
	case MODE_SENSE:
	case MODE_SENSE_10:
		length = le16_to_cpu(fst->Count);
		break;
	default:
		length = scsi_bufflen(srb);
	}

	
	if (length > scsi_bufflen(srb)) {
		length = scsi_bufflen(srb);
		US_DEBUGP("Truncating request to match buffer length: %d\n", length);
//.........这里部分代码省略.........

/*
 * Allocate a tcm_loop cmd descriptor from target_core_mod code
 *
 * Can be called from interrupt context in tcm_loop_queuecommand() below
 */
static struct se_cmd *tcm_loop_allocate_core_cmd(
	struct tcm_loop_hba *tl_hba,
	struct se_portal_group *se_tpg,
	struct scsi_cmnd *sc)
{
	struct se_cmd *se_cmd;
	struct se_session *se_sess;
	struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus;
	struct tcm_loop_cmd *tl_cmd;
	int sam_task_attr;

	if (!tl_nexus) {
		scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
				" does not exist\n");
		set_host_byte(sc, DID_ERROR);
		return NULL;
	}
	se_sess = tl_nexus->se_sess;

	tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
	if (!tl_cmd) {
		printk(KERN_ERR "Unable to allocate struct tcm_loop_cmd\n");
		set_host_byte(sc, DID_ERROR);
		return NULL;
	}
	se_cmd = &tl_cmd->tl_se_cmd;
	/*
	 * Save the pointer to struct scsi_cmnd *sc
	 */
	tl_cmd->sc = sc;
	/*
	 * Locate the SAM Task Attr from struct scsi_cmnd *
	 */
	if (sc->device->tagged_supported) {
		switch (sc->tag) {
		case HEAD_OF_QUEUE_TAG:
			sam_task_attr = MSG_HEAD_TAG;
			break;
		case ORDERED_QUEUE_TAG:
			sam_task_attr = MSG_ORDERED_TAG;
			break;
		default:
			sam_task_attr = MSG_SIMPLE_TAG;
			break;
		}
	} else
		sam_task_attr = MSG_SIMPLE_TAG;

	/*
	 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
	 */
	transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
			scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr,
			&tl_cmd->tl_sense_buf[0]);

	/*
	 * Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi
	 */
	if (scsi_bidi_cmnd(sc))
		T_TASK(se_cmd)->t_tasks_bidi = 1;
	/*
	 * Locate the struct se_lun pointer and attach it to struct se_cmd
	 */
	if (transport_get_lun_for_cmd(se_cmd, NULL, tl_cmd->sc->device->lun) < 0) {
		kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
		set_host_byte(sc, DID_NO_CONNECT);
		return NULL;
	}
	/*
	 * Because some userspace code via scsi-generic do not memset their
	 * associated read buffers, go ahead and do that here for type
	 * SCF_SCSI_CONTROL_SG_IO_CDB.  Also note that this is currently
	 * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB
	 * by target core in transport_generic_allocate_tasks() ->
	 * transport_generic_cmd_sequencer().
	 */
	if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB &&
	    se_cmd->data_direction == DMA_FROM_DEVICE) {
		struct scatterlist *sg = scsi_sglist(sc);
		unsigned char *buf = kmap(sg_page(sg)) + sg->offset;

		if (buf != NULL) {
			memset(buf, 0, sg->length);
			kunmap(sg_page(sg));
		}
	}

	transport_device_setup_cmd(se_cmd);
	return se_cmd;
}

static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
			     struct srp_indirect_buf *id,
			     enum dma_data_direction dir, srp_rdma_t rdma_io,
			     int dma_map, int ext_desc)
{
	struct iu_entry *iue = NULL;
	struct srp_direct_buf *md = NULL;
	struct scatterlist dummy, *sg = NULL;
	dma_addr_t token = 0;
	int err = 0;
	int nmd, nsg = 0, len;

	if (dma_map || ext_desc) {
		iue = (struct iu_entry *) sc->SCp.ptr;
		sg = scsi_sglist(sc);

		dprintk("%p %u %u %d %d\n",
			iue, scsi_bufflen(sc), id->len,
			cmd->data_in_desc_cnt, cmd->data_out_desc_cnt);
	}

	nmd = id->table_desc.len / sizeof(struct srp_direct_buf);

	if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) ||
	    (dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) {
		md = &id->desc_list[0];
		goto rdma;
	}

	if (ext_desc && dma_map) {
		md = dma_alloc_coherent(iue->target->dev, id->table_desc.len,
				&token, GFP_KERNEL);
		if (!md) {
			eprintk("Can't get dma memory %u\n", id->table_desc.len);
			return -ENOMEM;
		}

		sg_init_one(&dummy, md, id->table_desc.len);
		sg_dma_address(&dummy) = token;
		sg_dma_len(&dummy) = id->table_desc.len;
		err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE,
			      id->table_desc.len);
		if (err) {
			eprintk("Error copying indirect table %d\n", err);
			goto free_mem;
		}
	} else {
		eprintk("This command uses external indirect buffer\n");
		return -EINVAL;
	}

rdma:
	if (dma_map) {
		nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
				 DMA_BIDIRECTIONAL);
		if (!nsg) {
			eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc));
			err = -EIO;
			goto free_mem;
		}
		len = min(scsi_bufflen(sc), id->len);
	} else
		len = id->len;

	err = rdma_io(sc, sg, nsg, md, nmd, dir, len);

	if (dma_map)
		dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);

free_mem:
	if (token && dma_map)
		dma_free_coherent(iue->target->dev, id->table_desc.len, md, token);

	return err;
}

static int aha1542_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
{
	struct aha1542_cmd *acmd = scsi_cmd_priv(cmd);
	struct aha1542_hostdata *aha1542 = shost_priv(sh);
	u8 direction;
	u8 target = cmd->device->id;
	u8 lun = cmd->device->lun;
	unsigned long flags;
	int bufflen = scsi_bufflen(cmd);
	int mbo, sg_count;
	struct mailbox *mb = aha1542->mb;
	struct ccb *ccb = aha1542->ccb;

	if (*cmd->cmnd == REQUEST_SENSE) {
		/* Don't do the command - we have the sense data already */
		cmd->result = 0;
		cmd->scsi_done(cmd);
		return 0;
	}
#ifdef DEBUG
	{
		int i = -1;
		if (*cmd->cmnd == READ_10 || *cmd->cmnd == WRITE_10)
			i = xscsi2int(cmd->cmnd + 2);
		else if (*cmd->cmnd == READ_6 || *cmd->cmnd == WRITE_6)
			i = scsi2int(cmd->cmnd + 2);
		shost_printk(KERN_DEBUG, sh, "aha1542_queuecommand: dev %d cmd %02x pos %d len %d",
						target, *cmd->cmnd, i, bufflen);
		print_hex_dump_bytes("command: ", DUMP_PREFIX_NONE, cmd->cmnd, cmd->cmd_len);
	}
#endif
	sg_count = scsi_dma_map(cmd);
	if (sg_count) {
		size_t len = sg_count * sizeof(struct chain);

		acmd->chain = kmalloc(len, GFP_DMA);
		if (!acmd->chain)
			goto out_unmap;
		acmd->chain_handle = dma_map_single(sh->dma_dev, acmd->chain,
				len, DMA_TO_DEVICE);
		if (dma_mapping_error(sh->dma_dev, acmd->chain_handle))
			goto out_free_chain;
	}

	/* Use the outgoing mailboxes in a round-robin fashion, because this
	   is how the host adapter will scan for them */

	spin_lock_irqsave(sh->host_lock, flags);
	mbo = aha1542->aha1542_last_mbo_used + 1;
	if (mbo >= AHA1542_MAILBOXES)
		mbo = 0;

	do {
		if (mb[mbo].status == 0 && aha1542->int_cmds[mbo] == NULL)
			break;
		mbo++;
		if (mbo >= AHA1542_MAILBOXES)
			mbo = 0;
	} while (mbo != aha1542->aha1542_last_mbo_used);

	if (mb[mbo].status || aha1542->int_cmds[mbo])
		panic("Unable to find empty mailbox for aha1542.\n");

	aha1542->int_cmds[mbo] = cmd;	/* This will effectively prevent someone else from
					   screwing with this cdb. */

	aha1542->aha1542_last_mbo_used = mbo;

#ifdef DEBUG
	shost_printk(KERN_DEBUG, sh, "Sending command (%d %p)...", mbo, cmd->scsi_done);
#endif

	/* This gets trashed for some reason */
	any2scsi(mb[mbo].ccbptr, aha1542->ccb_handle + mbo * sizeof(*ccb));

	memset(&ccb[mbo], 0, sizeof(struct ccb));

	ccb[mbo].cdblen = cmd->cmd_len;

	direction = 0;
	if (*cmd->cmnd == READ_10 || *cmd->cmnd == READ_6)
		direction = 8;
	else if (*cmd->cmnd == WRITE_10 || *cmd->cmnd == WRITE_6)
		direction = 16;

	memcpy(ccb[mbo].cdb, cmd->cmnd, ccb[mbo].cdblen);

	if (bufflen) {
		struct scatterlist *sg;
		int i;

		ccb[mbo].op = 2;	/* SCSI Initiator Command  w/scatter-gather */
		scsi_for_each_sg(cmd, sg, sg_count, i) {
			any2scsi(acmd->chain[i].dataptr, sg_dma_address(sg));
			any2scsi(acmd->chain[i].datalen, sg_dma_len(sg));
		};
		any2scsi(ccb[mbo].datalen, sg_count * sizeof(struct chain));
		any2scsi(ccb[mbo].dataptr, acmd->chain_handle);
#ifdef DEBUG
		shost_printk(KERN_DEBUG, sh, "cptr %p: ", acmd->chain);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	/* if the transport provided its own sense data, don't auto-sense */
	if (result == USB_STOR_TRANSPORT_NO_SENSE)
	{
		srb->result = SAM_STAT_CHECK_CONDITION;
		return;
	}

	srb->result = SAM_STAT_GOOD;

	/* Determine if we need to auto-sense */
	need_auto_sense = 0;

	if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) && srb->sc_data_direction != DMA_FROM_DEVICE)
	{
		//printk("-- CB transport device requiring auto-sense\n");
		need_auto_sense = 1;
	}

	if (result == USB_STOR_TRANSPORT_FAILED)
	{
		//printk("-- transport indicates command failure\n");
		need_auto_sense = 1;
	}

	/* Now, if we need to do the auto-sense, let's do it */
	if (need_auto_sense)
	{
		int temp_result;
		struct scsi_eh_save ses;

		printk("Issuing auto-REQUEST_SENSE\n");

		scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE);

		/* we must do the protocol translation here */
		if (us->subclass == USB_SC_RBC || us->subclass == USB_SC_SCSI || us->subclass == USB_SC_CYP_ATACB)
			srb->cmd_len = 6;
		else
			srb->cmd_len = 12;

		/* issue the auto-sense command */
		scsi_set_resid(srb, 0);
		temp_result = us->transport(us->srb, us);

		/* let's clean up right away */
		scsi_eh_restore_cmnd(srb, &ses);

		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags))
		{
			//printk("-- auto-sense aborted\n");
			srb->result = DID_ABORT << 16;
			goto Handle_Errors;
		}
		if (temp_result != USB_STOR_TRANSPORT_GOOD)
		{
			//printk("-- auto-sense failure\n");
			srb->result = DID_ERROR << 16;
			if (!(us->fflags & US_FL_SCM_MULT_TARG))
				goto Handle_Errors;
			return;
		}

		/* set the result so the higher layers expect this data */
		srb->result = SAM_STAT_CHECK_CONDITION;

		if (result == USB_STOR_TRANSPORT_GOOD &&
			(srb->sense_buffer[2] & 0xaf) == 0 &&
			srb->sense_buffer[12] == 0 &&
			srb->sense_buffer[13] == 0)
		{
			srb->result = SAM_STAT_GOOD;
			srb->sense_buffer[0] = 0x0;
		}
	}

	/* Did we transfer less than the minimum amount required? */
	if (srb->result == SAM_STAT_GOOD &&	scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)
		srb->result = (DID_ERROR << 16);//v02 | (SUGGEST_RETRY << 24);

	return;

Handle_Errors:
	scsi_lock(us_to_host(us));
	set_bit(US_FLIDX_RESETTING, &us->dflags);
	clear_bit(US_FLIDX_ABORTING, &us->dflags);
	scsi_unlock(us_to_host(us));

	mutex_unlock(&us->dev_mutex);
	result = usb_stor_port_reset(us);
	mutex_lock(&us->dev_mutex);

	if (result < 0)
	{
		scsi_lock(us_to_host(us));
		usb_stor_report_device_reset(us);
		scsi_unlock(us_to_host(us));
		us->transport_reset(us);
	}
	clear_bit(US_FLIDX_RESETTING, &us->dflags);
}

//----- ENE_stor_invoke_transport() ---------------------
void ENE_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int result=0;

	//printk("transport --- ENE_stor_invoke_transport\n");
	usb_stor_print_cmd(srb);
	/* send the command to the transport layer */
	scsi_set_resid(srb, 0);
	if ( !(us->SD_Status.Ready || us->MS_Status.Ready || us->SM_Status.Ready) )
		result = ENE_InitMedia(us);
	
	if (us->Power_IsResum == true) {
		result = ENE_InitMedia(us);
		us->Power_IsResum = false;		
	}	
	
	if (us->SD_Status.Ready)	result = SD_SCSIIrp(us, srb);
	if (us->MS_Status.Ready)	result = MS_SCSIIrp(us, srb);
	if (us->SM_Status.Ready)	result = SM_SCSIIrp(us, srb);

	/* if the command gets aborted by the higher layers, we need to short-circuit all other processing */
	if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags))
	{
		//printk("-- command was aborted\n");
		srb->result = DID_ABORT << 16;
		goto Handle_Errors;
	}

	/* if there is a transport error, reset and don't auto-sense */
	if (result == USB_STOR_TRANSPORT_ERROR)
	{
		//printk("-- transport indicates error, resetting\n");
		srb->result = DID_ERROR << 16;
		goto Handle_Errors;
	}

	/* if the transport provided its own sense data, don't auto-sense */
	if (result == USB_STOR_TRANSPORT_NO_SENSE)
	{
		srb->result = SAM_STAT_CHECK_CONDITION;
		return;
	}

	srb->result = SAM_STAT_GOOD;
	if (result == USB_STOR_TRANSPORT_FAILED)
	{
		//printk("-- transport indicates command failure\n");
		//need_auto_sense = 1;
		BuildSenseBuffer(srb, us->SrbStatus);
		srb->result = SAM_STAT_CHECK_CONDITION;
	}

	/* Did we transfer less than the minimum amount required? */
	if (srb->result == SAM_STAT_GOOD && scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)
		srb->result = (DID_ERROR << 16);//v02 | (SUGGEST_RETRY << 24);

	return;

Handle_Errors:
	scsi_lock(us_to_host(us));
	set_bit(US_FLIDX_RESETTING, &us->dflags);
	clear_bit(US_FLIDX_ABORTING, &us->dflags);
	scsi_unlock(us_to_host(us));

	mutex_unlock(&us->dev_mutex);
	result = usb_stor_port_reset(us);
	mutex_lock(&us->dev_mutex);

	if (result < 0)
	{
		scsi_lock(us_to_host(us));
		usb_stor_report_device_reset(us);
		scsi_unlock(us_to_host(us));
		us->transport_reset(us);
	}
	clear_bit(US_FLIDX_RESETTING, &us->dflags);
}