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Commit 27c01c2d authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz
Browse files

ide-cd: remove obsolete seek optimization 



It doesn't make much sense nowadays and is problematic on some drives.

Cc: Borislav Petkov <petkovbb@googlemail.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent 08cd1dca

drivers/ide/ide-cd.c

+6 −83
Original line number Diff line number Diff line
@@ -774,52 +774,6 @@ static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive) 
	return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);

}



#define IDECD_SEEK_THRESHOLD	(1000)			/* 1000 blocks */

#define IDECD_SEEK_TIMER	(5 * WAIT_MIN_SLEEP)	/* 100 ms */

#define IDECD_SEEK_TIMEOUT	(2 * WAIT_CMD)		/* 20 sec */



static ide_startstop_t cdrom_seek_intr(ide_drive_t *drive)

{

	struct cdrom_info *info = drive->driver_data;

	int stat;

	static int retry = 10;



	ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);



	if (cdrom_decode_status(drive, 0, &stat))

		return ide_stopped;



	drive->atapi_flags |= IDE_AFLAG_SEEKING;



	if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {

		if (--retry == 0)

			drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;

	}

	return ide_stopped;

}



static void ide_cd_prepare_seek_request(ide_drive_t *drive, struct request *rq)

{

	sector_t frame = rq->sector;



	ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);



	sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);



	memset(rq->cmd, 0, BLK_MAX_CDB);

	rq->cmd[0] = GPCMD_SEEK;

	put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);



	rq->timeout = ATAPI_WAIT_PC;

}



static ide_startstop_t cdrom_start_seek_continuation(ide_drive_t *drive)

{

	struct request *rq = drive->hwif->hwgroup->rq;



	return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);

}



/*

 * Fix up a possibly partially-processed request so that we can start it over

 * entirely, or even put it back on the request queue.
@@ -1260,7 +1214,6 @@ static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq) 
static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,

					sector_t block)

{

	struct cdrom_info *info = drive->driver_data;

	ide_handler_t *fn;

	int xferlen;
@@ -1270,34 +1223,6 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq, 
		      (unsigned long long)block);



	if (blk_fs_request(rq)) {

		if (drive->atapi_flags & IDE_AFLAG_SEEKING) {

			ide_hwif_t *hwif = drive->hwif;

			unsigned long elapsed = jiffies - info->start_seek;

			int stat = hwif->tp_ops->read_status(hwif);



			if ((stat & ATA_DSC) != ATA_DSC) {

				if (elapsed < IDECD_SEEK_TIMEOUT) {

					ide_stall_queue(drive,

							IDECD_SEEK_TIMER);

					return ide_stopped;

				}

				printk(KERN_ERR PFX "%s: DSC timeout\n",

						drive->name);

			}

			drive->atapi_flags &= ~IDE_AFLAG_SEEKING;

		}

		if (rq_data_dir(rq) == READ &&

		    IDE_LARGE_SEEK(info->last_block, block,

			    IDECD_SEEK_THRESHOLD) &&

		    (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)) {

			xferlen = 0;

			fn = cdrom_start_seek_continuation;



			drive->dma = 0;

			info->start_seek = jiffies;



			ide_cd_prepare_seek_request(drive, rq);

		} else {

		xferlen = 32768;

		fn = cdrom_start_rw_cont;
@@ -1306,8 +1231,6 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq, 


		if (ide_cd_prepare_rw_request(drive, rq) == ide_stopped)

			return ide_stopped;

		}

		info->last_block = block;

	} else if (blk_sense_request(rq) || blk_pc_request(rq) ||

		   rq->cmd_type == REQ_TYPE_ATA_PC) {

		xferlen = rq->data_len;

drivers/ide/ide-cd.h

+0 −2
Original line number Diff line number Diff line
@@ -88,8 +88,6 @@ struct cdrom_info { 
	struct request_sense sense_data;



	struct request request_sense_request;

	unsigned long last_block;

	unsigned long start_seek;



	u8 max_speed;		/* Max speed of the drive. */

	u8 current_speed;	/* Current speed of the drive. */

include/linux/ide.h

+0 −4
Original line number Diff line number Diff line
@@ -122,8 +122,6 @@ struct ide_io_ports { 
#define MAX_DRIVES	2	/* per interface; 2 assumed by lots of code */

#define SECTOR_SIZE	512



#define IDE_LARGE_SEEK(b1,b2,t)	(((b1) > (b2) + (t)) || ((b2) > (b1) + (t)))



/*

 * Timeouts for various operations:

 */
@@ -496,8 +494,6 @@ enum { 
	 * when more than one interrupt is needed.

	 */

	IDE_AFLAG_LIMIT_NFRAMES		= (1 << 7),

	/* Seeking in progress. */

	IDE_AFLAG_SEEKING		= (1 << 8),

	/* Saved TOC information is current. */

	IDE_AFLAG_TOC_VALID		= (1 << 9),

	/* We think that the drive door is locked. */