ide-tape: remove misc references to pipelined operation in the comments

	 * While polling for DSC we use postponed_rq to postpone the current

	 * request so that ide.c will be able to service pending requests on the

	 * other device. Note that at most we will have only one DSC (usually

	 * data transfer) request in the device request queue. Additional

	 * requests can be queued in our internal pipeline, but they will be

	 * visible to ide.c only one at a time.

	 * data transfer) request in the device request queue.

	 */

	struct request *postponed_rq;

	/* The time in which we started polling for DSC */

	kfree(stage);

}

/*

 * Finish servicing a request and insert a pending pipeline request into the

 * main device queue.

 */

static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)

{

	struct request *rq = HWGROUP(drive)->rq;

	return idetape_issue_pc(drive, pc);

}

/* Pipeline related functions */

/*

 * The function below uses __get_free_page to allocate a pipeline stage, along

 * with all the necessary small buffers which together make a buffer of size

 *

 * It returns a pointer to the new allocated stage, or NULL if we can't (or

 * don't want to) allocate a stage.

 *

 * Pipeline stages are optional and are used to increase performance. If we

 * can't allocate them, we'll manage without them.

 */

static idetape_stage_t *__idetape_kmalloc_stage(idetape_tape_t *tape, int full,

						int clear)

	return 0;

}

/*

 * Called from idetape_chrdev_read() to service a character device read request

 * and add read-ahead requests to our pipeline.

 */

/* called from idetape_chrdev_read() to service a chrdev read request. */

static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)

{

	idetape_tape_t *tape = drive->driver_data;

 *

 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support

 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also

 * usually not supported (it is supported in the rare case in which we crossed

 * the filemark during our read-ahead pipelined operation mode).

 * usually not supported.

 *

 * The following commands are currently not supported:

 *

	debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",

			mt_op, mt_count);

	/* Commands which need our pipelined read-ahead stages. */

	switch (mt_op) {

	case MTFSF:

	case MTFSFM: