Merge branch 'bp-remove-pc-buf' into for-next

Conflicts:
	drivers/ide/ide-tape.c

5 files changed, 226 insertions, 247 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index bbdd2547f12a..6c73421c608b 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -10,6 +10,9 @@
 
 #include <scsi/scsi.h>
 
+#define DRV_NAME "ide-atapi"
+#define PFX DRV_NAME ": "
+
 #ifdef DEBUG
 #define debug_log(fmt, args...) \
 	printk(KERN_INFO "ide: " fmt, ## args)
@@ -74,8 +77,6 @@ EXPORT_SYMBOL_GPL(ide_check_atapi_device);
 void ide_init_pc(struct ide_atapi_pc *pc)
 {
 	memset(pc, 0, sizeof(*pc));
-	pc->buf = pc->pc_buf;
-	pc->buf_size = IDE_PC_BUFFER_SIZE;
 }
 EXPORT_SYMBOL_GPL(ide_init_pc);
 
@@ -84,7 +85,7 @@ EXPORT_SYMBOL_GPL(ide_init_pc);
  * and wait for it to be serviced.
  */
 int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
-		      struct ide_atapi_pc *pc)
+		      struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
 {
 	struct request *rq;
 	int error;
@@ -93,8 +94,8 @@ int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
 	rq->cmd_type = REQ_TYPE_SPECIAL;
 	rq->special = (char *)pc;
 
-	if (pc->req_xfer) {
-		error = blk_rq_map_kern(drive->queue, rq, pc->buf, pc->req_xfer,
+	if (buf && bufflen) {
+		error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
 					GFP_NOIO);
 		if (error)
 			goto put_req;
@@ -117,7 +118,7 @@ int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
 	ide_init_pc(&pc);
 	pc.c[0] = TEST_UNIT_READY;
 
-	return ide_queue_pc_tail(drive, disk, &pc);
+	return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 }
 EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
 
@@ -132,7 +133,7 @@ int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
 	if (drive->media == ide_tape)
 		pc.flags |= PC_FLAG_WAIT_FOR_DSC;
 
-	return ide_queue_pc_tail(drive, disk, &pc);
+	return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 }
 EXPORT_SYMBOL_GPL(ide_do_start_stop);
 
@@ -147,7 +148,7 @@ int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
 	pc.c[0] = ALLOW_MEDIUM_REMOVAL;
 	pc.c[4] = on;
 
-	return ide_queue_pc_tail(drive, disk, &pc);
+	return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 }
 EXPORT_SYMBOL_GPL(ide_set_media_lock);
 
@@ -172,8 +173,6 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
 	unsigned int cmd_len, sense_len;
 	int err;
 
-	debug_log("%s: enter\n", __func__);
-
 	switch (drive->media) {
 	case ide_floppy:
 		cmd_len = 255;
@@ -201,8 +200,8 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
 			      GFP_NOIO);
 	if (unlikely(err)) {
 		if (printk_ratelimit())
-			printk(KERN_WARNING "%s: failed to map sense buffer\n",
-			       drive->name);
+			printk(KERN_WARNING PFX "%s: failed to map sense "
+					    "buffer\n", drive->name);
 		return;
 	}
 
@@ -223,7 +222,7 @@ int ide_queue_sense_rq(ide_drive_t *drive, void *special)
 {
 	/* deferred failure from ide_prep_sense() */
 	if (!drive->sense_rq_armed) {
-		printk(KERN_WARNING "%s: failed queue sense request\n",
+		printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
 		       drive->name);
 		return -ENOMEM;
 	}
@@ -255,8 +254,6 @@ void ide_retry_pc(ide_drive_t *drive)
 	/* init pc from sense_rq */
 	ide_init_pc(pc);
 	memcpy(pc->c, sense_rq->cmd, 12);
-	pc->buf = bio_data(sense_rq->bio);	/* pointer to mapped address */
-	pc->req_xfer = blk_rq_bytes(sense_rq);
 
 	if (drive->media == ide_tape)
 		drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
@@ -298,7 +295,7 @@ int ide_cd_expiry(ide_drive_t *drive)
 		break;
 	default:
 		if (!(rq->cmd_flags & REQ_QUIET))
-			printk(KERN_INFO "cmd 0x%x timed out\n",
+			printk(KERN_INFO PFX "cmd 0x%x timed out\n",
 					 rq->cmd[0]);
 		wait = 0;
 		break;
@@ -332,6 +329,55 @@ void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
 
 /*
+ * Check the contents of the interrupt reason register and attempt to recover if
+ * there are problems.
+ *
+ * Returns:
+ * - 0 if everything's ok
+ * - 1 if the request has to be terminated.
+ */
+int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
+		      int ireason, int rw)
+{
+	ide_hwif_t *hwif = drive->hwif;
+
+	debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);
+
+	if (ireason == (!rw << 1))
+		return 0;
+	else if (ireason == (rw << 1)) {
+		printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
+				drive->name, __func__);
+
+		if (dev_is_idecd(drive))
+			ide_pad_transfer(drive, rw, len);
+	} else if (!rw && ireason == ATAPI_COD) {
+		if (dev_is_idecd(drive)) {
+			/*
+			 * Some drives (ASUS) seem to tell us that status info
+			 * is available.  Just get it and ignore.
+			 */
+			(void)hwif->tp_ops->read_status(hwif);
+			return 0;
+		}
+	} else {
+		if (ireason & ATAPI_COD)
+			printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
+					__func__);
+
+		/* drive wants a command packet, or invalid ireason... */
+		printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
+				drive->name, __func__, ireason);
+	}
+
+	if (dev_is_idecd(drive) && rq->cmd_type == REQ_TYPE_ATA_PC)
+		rq->cmd_flags |= REQ_FAILED;
+
+	return 1;
+}
+EXPORT_SYMBOL_GPL(ide_check_ireason);
+
+/*
  * This is the usual interrupt handler which will be called during a packet
  * command.  We will transfer some of the data (as requested by the drive)
  * and will re-point interrupt handler to us.
@@ -365,12 +411,12 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 
 		if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
 			if (drive->media == ide_floppy)
-				printk(KERN_ERR "%s: DMA %s error\n",
+				printk(KERN_ERR PFX "%s: DMA %s error\n",
 					drive->name, rq_data_dir(pc->rq)
 						     ? "write" : "read");
 			pc->flags |= PC_FLAG_DMA_ERROR;
 		} else
-			pc->xferred = pc->req_xfer;
+			rq->resid_len = 0;
 		debug_log("%s: DMA finished\n", drive->name);
 	}
 
@@ -379,7 +425,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 		int uptodate, error;
 
 		debug_log("Packet command completed, %d bytes transferred\n",
-			  pc->xferred);
+			  blk_rq_bytes(rq));
 
 		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 
@@ -397,8 +443,8 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 				pc->rq->errors++;
 
 			if (rq->cmd[0] == REQUEST_SENSE) {
-				printk(KERN_ERR "%s: I/O error in request sense"
-						" command\n", drive->name);
+				printk(KERN_ERR PFX "%s: I/O error in request "
+						"sense command\n", drive->name);
 				return ide_do_reset(drive);
 			}
 
@@ -446,8 +492,8 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 
 	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
-		printk(KERN_ERR "%s: The device wants to issue more interrupts "
-				"in DMA mode\n", drive->name);
+		printk(KERN_ERR PFX "%s: The device wants to issue more "
+				"interrupts in DMA mode\n", drive->name);
 		ide_dma_off(drive);
 		return ide_do_reset(drive);
 	}
@@ -455,33 +501,22 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 	/* Get the number of bytes to transfer on this interrupt. */
 	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
 
-	if (ireason & ATAPI_COD) {
-		printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
+	if (ide_check_ireason(drive, rq, bcount, ireason, write))
 		return ide_do_reset(drive);
-	}
-
-	if (((ireason & ATAPI_IO) == ATAPI_IO) == write) {
-		/* Hopefully, we will never get here */
-		printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
-				"to %s!\n", drive->name,
-				(ireason & ATAPI_IO) ? "Write" : "Read",
-				(ireason & ATAPI_IO) ? "Read" : "Write");
-		return ide_do_reset(drive);
-	}
 
 	done = min_t(unsigned int, bcount, cmd->nleft);
 	ide_pio_bytes(drive, cmd, write, done);
 
 	/* Update transferred byte count */
-	pc->xferred += done;
+	rq->resid_len -= done;
 
 	bcount -= done;
 
 	if (bcount)
 		ide_pad_transfer(drive, write, bcount);
 
-	debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n",
-		  rq->cmd[0], done, bcount);
+	debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
+		  rq->cmd[0], done, bcount, rq->resid_len);
 
 	/* And set the interrupt handler again */
 	ide_set_handler(drive, ide_pc_intr, timeout);
@@ -515,13 +550,13 @@ static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
 
 	while (retries-- && ((ireason & ATAPI_COD) == 0 ||
 		(ireason & ATAPI_IO))) {
-		printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
+		printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
 				"a packet command, retrying\n", drive->name);
 		udelay(100);
 		ireason = ide_read_ireason(drive);
 		if (retries == 0) {
-			printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
-					"a packet command, ignoring\n",
+			printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
+					" a packet command, ignoring\n",
 					drive->name);
 			ireason |= ATAPI_COD;
 			ireason &= ~ATAPI_IO;
@@ -552,7 +587,7 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
 	u8 ireason;
 
 	if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
-		printk(KERN_ERR "%s: Strange, packet command initiated yet "
+		printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
 				"DRQ isn't asserted\n", drive->name);
 		return startstop;
 	}
@@ -594,8 +629,8 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
 			ireason = ide_wait_ireason(drive, ireason);
 
 		if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
-			printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
-					"a packet command\n", drive->name);
+			printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
+				"issuing a packet command\n", drive->name);
 
 			return ide_do_reset(drive);
 		}
@@ -633,7 +668,7 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 	ide_hwif_t *hwif = drive->hwif;
 	ide_expiry_t *expiry = NULL;
 	struct request *rq = hwif->rq;
-	unsigned int timeout;
+	unsigned int timeout, bytes;
 	u16 bcount;
 	u8 valid_tf;
 	u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
@@ -649,13 +684,14 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 	} else {
 		pc = drive->pc;
 
-		/* We haven't transferred any data yet */
-		pc->xferred = 0;
-
 		valid_tf = IDE_VALID_DEVICE;
-		bcount = ((drive->media == ide_tape) ?
-				pc->req_xfer :
-				min(pc->req_xfer, 63 * 1024));
+		bytes = blk_rq_bytes(rq);
+		bcount = ((drive->media == ide_tape) ? bytes
+						     : min_t(unsigned int,
+							     bytes, 63 * 1024));
+
+		/* We haven't transferred any data yet */
+		rq->resid_len = bcount;
 
 		if (pc->flags & PC_FLAG_DMA_ERROR) {
 			pc->flags &= ~PC_FLAG_DMA_ERROR;
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 424140c6c400..dcd72445b0cd 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -92,16 +92,16 @@ static void cdrom_saw_media_change(ide_drive_t *drive)
 	drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
 }
 
-static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
-			   struct request_sense *sense)
+static int cdrom_log_sense(ide_drive_t *drive, struct request *rq)
 {
+	struct request_sense *sense = &drive->sense_data;
 	int log = 0;
 
-	ide_debug_log(IDE_DBG_SENSE, "sense_key: 0x%x", sense->sense_key);
-
 	if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
 		return 0;
 
+	ide_debug_log(IDE_DBG_SENSE, "sense_key: 0x%x", sense->sense_key);
+
 	switch (sense->sense_key) {
 	case NO_SENSE:
 	case RECOVERED_ERROR:
@@ -140,12 +140,12 @@ static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
 }
 
 static void cdrom_analyze_sense_data(ide_drive_t *drive,
-			      struct request *failed_command,
-			      struct request_sense *sense)
+				     struct request *failed_command)
 {
+	struct request_sense *sense = &drive->sense_data;
+	struct cdrom_info *info = drive->driver_data;
 	unsigned long sector;
 	unsigned long bio_sectors;
-	struct cdrom_info *info = drive->driver_data;
 
 	ide_debug_log(IDE_DBG_SENSE, "error_code: 0x%x, sense_key: 0x%x",
 				     sense->error_code, sense->sense_key);
@@ -154,7 +154,7 @@ static void cdrom_analyze_sense_data(ide_drive_t *drive,
 		ide_debug_log(IDE_DBG_SENSE, "failed cmd: 0x%x",
 					     failed_command->cmd[0]);
 
-	if (!cdrom_log_sense(drive, failed_command, sense))
+	if (!cdrom_log_sense(drive, failed_command))
 		return;
 
 	/*
@@ -225,15 +225,14 @@ static void ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
 			 * sense pointer set.
 			 */
 			memcpy(failed->sense, sense, 18);
-			sense = failed->sense;
 			failed->sense_len = rq->sense_len;
 		}
-		cdrom_analyze_sense_data(drive, failed, sense);
+		cdrom_analyze_sense_data(drive, failed);
 
 		if (ide_end_rq(drive, failed, -EIO, blk_rq_bytes(failed)))
 			BUG();
 	} else
-		cdrom_analyze_sense_data(drive, NULL, sense);
+		cdrom_analyze_sense_data(drive, NULL);
 }
 
 
@@ -410,50 +409,6 @@ end_request:
 		return 2;
 }
 
-/*
- * Check the contents of the interrupt reason register from the cdrom
- * and attempt to recover if there are problems.  Returns  0 if everything's
- * ok; nonzero if the request has been terminated.
- */
-static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
-				int len, int ireason, int rw)
-{
-	ide_hwif_t *hwif = drive->hwif;
-
-	ide_debug_log(IDE_DBG_FUNC, "ireason: 0x%x, rw: 0x%x", ireason, rw);
-
-	/*
-	 * ireason == 0: the drive wants to receive data from us
-	 * ireason == 2: the drive is expecting to transfer data to us
-	 */
-	if (ireason == (!rw << 1))
-		return 0;
-	else if (ireason == (rw << 1)) {
-
-		/* whoops... */
-		printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
-				drive->name, __func__);
-
-		ide_pad_transfer(drive, rw, len);
-	} else  if (rw == 0 && ireason == 1) {
-		/*
-		 * Some drives (ASUS) seem to tell us that status info is
-		 * available.  Just get it and ignore.
-		 */
-		(void)hwif->tp_ops->read_status(hwif);
-		return 0;
-	} else {
-		/* drive wants a command packet, or invalid ireason... */
-		printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
-				drive->name, __func__, ireason);
-	}
-
-	if (rq->cmd_type == REQ_TYPE_ATA_PC)
-		rq->cmd_flags |= REQ_FAILED;
-
-	return -1;
-}
-
 static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct ide_cmd *cmd)
 {
 	struct request *rq = cmd->rq;
@@ -645,8 +600,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 		goto out_end;
 	}
 
-	/* check which way to transfer data */
-	rc = ide_cd_check_ireason(drive, rq, len, ireason, write);
+	rc = ide_check_ireason(drive, rq, len, ireason, write);
 	if (rc)
 		goto out_end;
 
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 650981758f15..800c83a9db83 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -77,7 +77,8 @@ static int ide_floppy_callback(ide_drive_t *drive, int dsc)
 	    (rq && blk_pc_request(rq)))
 		uptodate = 1; /* FIXME */
 	else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
-		u8 *buf = pc->buf;
+
+		u8 *buf = bio_data(rq->bio);
 
 		if (!pc->error) {
 			floppy->sense_key = buf[2] & 0x0F;
@@ -209,8 +210,7 @@ static void idefloppy_create_rw_cmd(ide_drive_t *drive,
 	pc->rq = rq;
 	if (rq->cmd_flags & REQ_RW)
 		pc->flags |= PC_FLAG_WRITING;
-	pc->buf = NULL;
-	pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
+
 	pc->flags |= PC_FLAG_DMA_OK;
 }
 
@@ -225,9 +225,6 @@ static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
 		if (rq_data_dir(rq) == WRITE)
 			pc->flags |= PC_FLAG_WRITING;
 	}
-	/* pio will be performed by ide_pio_bytes() which handles sg fine */
-	pc->buf = NULL;
-	pc->req_xfer = pc->buf_size = blk_rq_bytes(rq);
 }
 
 static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
@@ -286,8 +283,8 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
 
 	cmd.rq = rq;
 
-	if (blk_fs_request(rq) || pc->req_xfer) {
-		ide_init_sg_cmd(&cmd, pc->req_xfer);
+	if (blk_fs_request(rq) || blk_rq_bytes(rq)) {
+		ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
 		ide_map_sg(drive, &cmd);
 	}
 
@@ -311,33 +308,33 @@ static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive,
 {
 	struct ide_disk_obj *floppy = drive->driver_data;
 	struct gendisk *disk = floppy->disk;
-	u8 *page;
+	u8 *page, buf[40];
 	int capacity, lba_capacity;
 	u16 transfer_rate, sector_size, cyls, rpm;
 	u8 heads, sectors;
 
 	ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
 
-	if (ide_queue_pc_tail(drive, disk, pc)) {
+	if (ide_queue_pc_tail(drive, disk, pc, buf, pc->req_xfer)) {
 		printk(KERN_ERR PFX "Can't get flexible disk page params\n");
 		return 1;
 	}
 
-	if (pc->buf[3] & 0x80)
+	if (buf[3] & 0x80)
 		drive->dev_flags |= IDE_DFLAG_WP;
 	else
 		drive->dev_flags &= ~IDE_DFLAG_WP;
 
 	set_disk_ro(disk, !!(drive->dev_flags & IDE_DFLAG_WP));
 
-	page = &pc->buf[8];
+	page = &buf[8];
 
-	transfer_rate = be16_to_cpup((__be16 *)&pc->buf[8 + 2]);
-	sector_size   = be16_to_cpup((__be16 *)&pc->buf[8 + 6]);
-	cyls          = be16_to_cpup((__be16 *)&pc->buf[8 + 8]);
-	rpm           = be16_to_cpup((__be16 *)&pc->buf[8 + 28]);
-	heads         = pc->buf[8 + 4];
-	sectors       = pc->buf[8 + 5];
+	transfer_rate = be16_to_cpup((__be16 *)&buf[8 + 2]);
+	sector_size   = be16_to_cpup((__be16 *)&buf[8 + 6]);
+	cyls          = be16_to_cpup((__be16 *)&buf[8 + 8]);
+	rpm           = be16_to_cpup((__be16 *)&buf[8 + 28]);
+	heads         = buf[8 + 4];
+	sectors       = buf[8 + 5];
 
 	capacity = cyls * heads * sectors * sector_size;
 
@@ -387,22 +384,19 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
 	drive->capacity64 = 0;
 
 	ide_floppy_create_read_capacity_cmd(&pc);
-	pc.buf = &pc_buf[0];
-	pc.buf_size = sizeof(pc_buf);
-
-	if (ide_queue_pc_tail(drive, disk, &pc)) {
+	if (ide_queue_pc_tail(drive, disk, &pc, pc_buf, pc.req_xfer)) {
 		printk(KERN_ERR PFX "Can't get floppy parameters\n");
 		return 1;
 	}
-	header_len = pc.buf[3];
-	cap_desc = &pc.buf[4];
+	header_len = pc_buf[3];
+	cap_desc = &pc_buf[4];
 	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 
 	for (i = 0; i < desc_cnt; i++) {
 		unsigned int desc_start = 4 + i*8;
 
-		blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
-		length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
+		blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
+		length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
 
 		ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
 					     "%d sector size",
@@ -415,7 +409,7 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
 		 * the code below is valid only for the 1st descriptor, ie i=0
 		 */
 
-		switch (pc.buf[desc_start + 4] & 0x03) {
+		switch (pc_buf[desc_start + 4] & 0x03) {
 		/* Clik! drive returns this instead of CAPACITY_CURRENT */
 		case CAPACITY_UNFORMATTED:
 			if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
@@ -464,7 +458,7 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
 			break;
 		}
 		ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d",
-					     pc.buf[desc_start + 4] & 0x03);
+					     pc_buf[desc_start + 4] & 0x03);
 	}
 
 	/* Clik! disk does not support get_flexible_disk_page */
diff --git a/drivers/ide/ide-floppy_ioctl.c b/drivers/ide/ide-floppy_ioctl.c
index cd8a42027ede..9c2288234dea 100644
--- a/drivers/ide/ide-floppy_ioctl.c
+++ b/drivers/ide/ide-floppy_ioctl.c
@@ -47,15 +47,13 @@ static int ide_floppy_get_format_capacities(ide_drive_t *drive,
 		return -EINVAL;
 
 	ide_floppy_create_read_capacity_cmd(pc);
-	pc->buf = &pc_buf[0];
-	pc->buf_size = sizeof(pc_buf);
 
-	if (ide_queue_pc_tail(drive, floppy->disk, pc)) {
+	if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
 		printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
 		return -EIO;
 	}
 
-	header_len = pc->buf[3];
+	header_len = pc_buf[3];
 	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 
 	u_index = 0;
@@ -72,8 +70,8 @@ static int ide_floppy_get_format_capacities(ide_drive_t *drive,
 		if (u_index >= u_array_size)
 			break;	/* User-supplied buffer too small */
 
-		blocks = be32_to_cpup((__be32 *)&pc->buf[desc_start]);
-		length = be16_to_cpup((__be16 *)&pc->buf[desc_start + 6]);
+		blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
+		length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
 
 		if (put_user(blocks, argp))
 			return -EFAULT;
@@ -94,40 +92,42 @@ static int ide_floppy_get_format_capacities(ide_drive_t *drive,
 	return 0;
 }
 
-static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
-		int l, int flags)
+static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc,
+					      u8 *buf, int b, int l,
+					      int flags)
 {
 	ide_init_pc(pc);
 	pc->c[0] = GPCMD_FORMAT_UNIT;
 	pc->c[1] = 0x17;
 
-	memset(pc->buf, 0, 12);
-	pc->buf[1] = 0xA2;
+	memset(buf, 0, 12);
+	buf[1] = 0xA2;
 	/* Default format list header, u8 1: FOV/DCRT/IMM bits set */
 
 	if (flags & 1)				/* Verify bit on... */
-		pc->buf[1] ^= 0x20;		/* ... turn off DCRT bit */
-	pc->buf[3] = 8;
+		buf[1] ^= 0x20;			/* ... turn off DCRT bit */
+	buf[3] = 8;
 
-	put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
-	put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
-	pc->buf_size = 12;
+	put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4]));
+	put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8]));
+	pc->req_xfer = 12;
 	pc->flags |= PC_FLAG_WRITING;
 }
 
 static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
 {
 	struct ide_disk_obj *floppy = drive->driver_data;
+	u8 buf[20];
 
 	drive->atapi_flags &= ~IDE_AFLAG_SRFP;
 
 	ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
 	pc->flags |= PC_FLAG_SUPPRESS_ERROR;
 
-	if (ide_queue_pc_tail(drive, floppy->disk, pc))
+	if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
 		return 1;
 
-	if (pc->buf[8 + 2] & 0x40)
+	if (buf[8 + 2] & 0x40)
 		drive->atapi_flags |= IDE_AFLAG_SRFP;
 
 	return 0;
@@ -137,6 +137,7 @@ static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
 				  int __user *arg)
 {
 	struct ide_disk_obj *floppy = drive->driver_data;
+	u8 buf[12];
 	int blocks, length, flags, err = 0;
 
 	if (floppy->openers > 1) {
@@ -170,9 +171,9 @@ static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
 	}
 
 	ide_floppy_get_sfrp_bit(drive, pc);
-	ide_floppy_create_format_unit_cmd(pc, blocks, length, flags);
+	ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags);
 
-	if (ide_queue_pc_tail(drive, floppy->disk, pc))
+	if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
 		err = -EIO;
 
 out:
@@ -196,11 +197,13 @@ static int ide_floppy_get_format_progress(ide_drive_t *drive,
 					  int __user *arg)
 {
 	struct ide_disk_obj *floppy = drive->driver_data;
+	u8 sense_buf[18];
 	int progress_indication = 0x10000;
 
 	if (drive->atapi_flags & IDE_AFLAG_SRFP) {
 		ide_create_request_sense_cmd(drive, pc);
-		if (ide_queue_pc_tail(drive, floppy->disk, pc))
+		if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf,
+				      pc->req_xfer))
 			return -EIO;
 
 		if (floppy->sense_key == 2 &&
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 4b447a8a49d4..bb71e1e99dad 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -279,10 +279,12 @@ static void ide_tape_put(struct ide_tape_obj *tape)
  * called on each failed packet command retry to analyze the request sense. We
  * currently do not utilize this information.
  */
-static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
+static void idetape_analyze_error(ide_drive_t *drive)
 {
 	idetape_tape_t *tape = drive->driver_data;
 	struct ide_atapi_pc *pc = drive->failed_pc;
+	struct request *rq = drive->hwif->rq;
+	u8 *sense = bio_data(rq->bio);
 
 	tape->sense_key = sense[2] & 0xF;
 	tape->asc       = sense[12];
@@ -291,11 +293,9 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
 	debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
 		 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
 
-	/* Correct pc->xferred by asking the tape.	 */
+	/* correct remaining bytes to transfer */
 	if (pc->flags & PC_FLAG_DMA_ERROR)
-		pc->xferred = pc->req_xfer -
-			tape->blk_size *
-			get_unaligned_be32(&sense[3]);
+		rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]);
 
 	/*
 	 * If error was the result of a zero-length read or write command,
@@ -329,7 +329,7 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
 			pc->flags |= PC_FLAG_ABORT;
 		}
 		if (!(pc->flags & PC_FLAG_ABORT) &&
-		    pc->xferred)
+		    (blk_rq_bytes(rq) - rq->resid_len))
 			pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
 	}
 }
@@ -354,12 +354,13 @@ static int ide_tape_callback(ide_drive_t *drive, int dsc)
 
 	if (pc->c[0] == REQUEST_SENSE) {
 		if (uptodate)
-			idetape_analyze_error(drive, pc->buf);
+			idetape_analyze_error(drive);
 		else
 			printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
 					"itself - Aborting request!\n");
 	} else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
-		int blocks = pc->xferred / tape->blk_size;
+		unsigned int blocks =
+			(blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size;
 
 		tape->avg_size += blocks * tape->blk_size;
 
@@ -371,38 +372,12 @@ static int ide_tape_callback(ide_drive_t *drive, int dsc)
 		}
 
 		tape->first_frame += blocks;
-		rq->resid_len -= blocks * tape->blk_size;
 
 		if (pc->error) {
 			uptodate = 0;
 			err = pc->error;
 		}
-	} else if (pc->c[0] == READ_POSITION && uptodate) {
-		u8 *readpos = pc->buf;
-
-		debug_log(DBG_SENSE, "BOP - %s\n",
-				(readpos[0] & 0x80) ? "Yes" : "No");
-		debug_log(DBG_SENSE, "EOP - %s\n",
-				(readpos[0] & 0x40) ? "Yes" : "No");
-
-		if (readpos[0] & 0x4) {
-			printk(KERN_INFO "ide-tape: Block location is unknown"
-					 "to the tape\n");
-			clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
-				  &drive->atapi_flags);
-			uptodate = 0;
-			err = IDE_DRV_ERROR_GENERAL;
-		} else {
-			debug_log(DBG_SENSE, "Block Location - %u\n",
-					be32_to_cpup((__be32 *)&readpos[4]));
-
-			tape->partition = readpos[1];
-			tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
-			set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
-				&drive->atapi_flags);
-		}
 	}
-
 	rq->errors = err;
 
 	return uptodate;
@@ -477,6 +452,7 @@ static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
 					 struct ide_atapi_pc *pc)
 {
 	idetape_tape_t *tape = drive->driver_data;
+	struct request *rq = drive->hwif->rq;
 
 	if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
 		drive->failed_pc = pc;
@@ -486,7 +462,6 @@ static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
 
 	if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
 		(pc->flags & PC_FLAG_ABORT)) {
-		unsigned int done = blk_rq_bytes(drive->hwif->rq);
 
 		/*
 		 * We will "abort" retrying a packet command in case legitimate
@@ -510,7 +485,7 @@ static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
 
 		drive->failed_pc = NULL;
 		drive->pc_callback(drive, 0);
-		ide_complete_rq(drive, -EIO, done);
+		ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
 		return ide_stopped;
 	}
 	debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
@@ -579,15 +554,13 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
 				   struct ide_atapi_pc *pc, struct request *rq,
 				   u8 opcode)
 {
-	unsigned int length = blk_rq_sectors(rq);
+	unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);
 
 	ide_init_pc(pc);
 	put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
 	pc->c[1] = 1;
-	pc->buf = NULL;
-	pc->buf_size = length * tape->blk_size;
-	pc->req_xfer = pc->buf_size;
-	if (pc->req_xfer == tape->buffer_size)
+
+	if (blk_rq_bytes(rq) == tape->buffer_size)
 		pc->flags |= PC_FLAG_DMA_OK;
 
 	if (opcode == READ_6)
@@ -713,7 +686,7 @@ out:
 
 	cmd.rq = rq;
 
-	ide_init_sg_cmd(&cmd, pc->req_xfer);
+	ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
 	ide_map_sg(drive, &cmd);
 
 	return ide_tape_issue_pc(drive, &cmd, pc);
@@ -767,33 +740,53 @@ static int idetape_flush_tape_buffers(ide_drive_t *drive)
 	int rc;
 
 	idetape_create_write_filemark_cmd(drive, &pc, 0);
-	rc = ide_queue_pc_tail(drive, tape->disk, &pc);
+	rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0);
 	if (rc)
 		return rc;
 	idetape_wait_ready(drive, 60 * 5 * HZ);
 	return 0;
 }
 
-static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
-{
-	ide_init_pc(pc);
-	pc->c[0] = READ_POSITION;
-	pc->req_xfer = 20;
-}
-
-static int idetape_read_position(ide_drive_t *drive)
+static int ide_tape_read_position(ide_drive_t *drive)
 {
 	idetape_tape_t *tape = drive->driver_data;
 	struct ide_atapi_pc pc;
-	int position;
+	u8 buf[20];
 
 	debug_log(DBG_PROCS, "Enter %s\n", __func__);
 
-	idetape_create_read_position_cmd(&pc);
-	if (ide_queue_pc_tail(drive, tape->disk, &pc))
+	/* prep cmd */
+	ide_init_pc(&pc);
+	pc.c[0] = READ_POSITION;
+	pc.req_xfer = 20;
+
+	if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer))
 		return -1;
-	position = tape->first_frame;
-	return position;
+
+	if (!pc.error) {
+		debug_log(DBG_SENSE, "BOP - %s\n",
+				(buf[0] & 0x80) ? "Yes" : "No");
+		debug_log(DBG_SENSE, "EOP - %s\n",
+				(buf[0] & 0x40) ? "Yes" : "No");
+
+		if (buf[0] & 0x4) {
+			printk(KERN_INFO "ide-tape: Block location is unknown"
+					 "to the tape\n");
+			clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
+				  &drive->atapi_flags);
+			return -1;
+		} else {
+			debug_log(DBG_SENSE, "Block Location - %u\n",
+					be32_to_cpup((__be32 *)&buf[4]));
+
+			tape->partition = buf[1];
+			tape->first_frame = be32_to_cpup((__be32 *)&buf[4]);
+			set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
+				&drive->atapi_flags);
+		}
+	}
+
+	return tape->first_frame;
 }
 
 static void idetape_create_locate_cmd(ide_drive_t *drive,
@@ -836,19 +829,21 @@ static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
 {
 	idetape_tape_t *tape = drive->driver_data;
 	struct gendisk *disk = tape->disk;
-	int retval;
+	int ret;
 	struct ide_atapi_pc pc;
 
 	if (tape->chrdev_dir == IDETAPE_DIR_READ)
 		__ide_tape_discard_merge_buffer(drive);
 	idetape_wait_ready(drive, 60 * 5 * HZ);
 	idetape_create_locate_cmd(drive, &pc, block, partition, skip);
-	retval = ide_queue_pc_tail(drive, disk, &pc);
-	if (retval)
-		return (retval);
+	ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
+	if (ret)
+		return ret;
 
-	idetape_create_read_position_cmd(&pc);
-	return ide_queue_pc_tail(drive, disk, &pc);
+	ret = ide_tape_read_position(drive);
+	if (ret < 0)
+		return ret;
+	return 0;
 }
 
 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
@@ -859,7 +854,7 @@ static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
 
 	__ide_tape_discard_merge_buffer(drive);
 	if (restore_position) {
-		position = idetape_read_position(drive);
+		position = ide_tape_read_position(drive);
 		seek = position > 0 ? position : 0;
 		if (idetape_position_tape(drive, seek, 0, 0)) {
 			printk(KERN_INFO "ide-tape: %s: position_tape failed in"
@@ -1039,20 +1034,19 @@ static int idetape_rewind_tape(ide_drive_t *drive)
 {
 	struct ide_tape_obj *tape = drive->driver_data;
 	struct gendisk *disk = tape->disk;
-	int retval;
 	struct ide_atapi_pc pc;
+	int ret;
 
 	debug_log(DBG_SENSE, "Enter %s\n", __func__);
 
 	idetape_create_rewind_cmd(drive, &pc);
-	retval = ide_queue_pc_tail(drive, disk, &pc);
-	if (retval)
-		return retval;
+	ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
+	if (ret)
+		return ret;
 
-	idetape_create_read_position_cmd(&pc);
-	retval = ide_queue_pc_tail(drive, disk, &pc);
-	if (retval)
-		return retval;
+	ret = ide_tape_read_position(drive);
+	if (ret < 0)
+		return ret;
 	return 0;
 }
 
@@ -1119,7 +1113,7 @@ static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
 	case MTBSF:
 		idetape_create_space_cmd(&pc, mt_count - count,
 					 IDETAPE_SPACE_OVER_FILEMARK);
-		return ide_queue_pc_tail(drive, disk, &pc);
+		return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 	case MTFSFM:
 	case MTBSFM:
 		if (!sprev)
@@ -1259,7 +1253,7 @@ static int idetape_write_filemark(ide_drive_t *drive)
 
 	/* Write a filemark */
 	idetape_create_write_filemark_cmd(drive, &pc, 1);
-	if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
+	if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) {
 		printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
 		return -EIO;
 	}
@@ -1345,11 +1339,11 @@ static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
 			IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
 	case MTEOM:
 		idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
-		return ide_queue_pc_tail(drive, disk, &pc);
+		return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 	case MTERASE:
 		(void)idetape_rewind_tape(drive);
 		idetape_create_erase_cmd(&pc);
-		return ide_queue_pc_tail(drive, disk, &pc);
+		return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 	case MTSETBLK:
 		if (mt_count) {
 			if (mt_count < tape->blk_size ||
@@ -1415,7 +1409,7 @@ static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
 	if (cmd == MTIOCGET || cmd == MTIOCPOS) {
 		block_offset = tape->valid /
 			(tape->blk_size * tape->user_bs_factor);
-		position = idetape_read_position(drive);
+		position = ide_tape_read_position(drive);
 		if (position < 0)
 			return -EIO;
 	}
@@ -1458,9 +1452,10 @@ static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
 {
 	idetape_tape_t *tape = drive->driver_data;
 	struct ide_atapi_pc pc;
+	u8 buf[12];
 
 	idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
-	if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
+	if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
 		printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
 		if (tape->blk_size == 0) {
 			printk(KERN_WARNING "ide-tape: Cannot deal with zero "
@@ -1469,10 +1464,10 @@ static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
 		}
 		return;
 	}
-	tape->blk_size = (pc.buf[4 + 5] << 16) +
-				(pc.buf[4 + 6] << 8)  +
-				 pc.buf[4 + 7];
-	tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
+	tape->blk_size = (buf[4 + 5] << 16) +
+				(buf[4 + 6] << 8)  +
+				 buf[4 + 7];
+	tape->drv_write_prot = (buf[2] & 0x80) >> 7;
 }
 
 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
@@ -1615,17 +1610,14 @@ static void idetape_get_inquiry_results(ide_drive_t *drive)
 	char fw_rev[4], vendor_id[8], product_id[16];
 
 	idetape_create_inquiry_cmd(&pc);
-	pc.buf = &pc_buf[0];
-	pc.buf_size = sizeof(pc_buf);
-
-	if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
+	if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) {
 		printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
 				tape->name);
 		return;
 	}
-	memcpy(vendor_id, &pc.buf[8], 8);
-	memcpy(product_id, &pc.buf[16], 16);
-	memcpy(fw_rev, &pc.buf[32], 4);
+	memcpy(vendor_id, &pc_buf[8], 8);
+	memcpy(product_id, &pc_buf[16], 16);
+	memcpy(fw_rev, &pc_buf[32], 4);
 
 	ide_fixstring(vendor_id, 8, 0);
 	ide_fixstring(product_id, 16, 0);
@@ -1643,11 +1635,11 @@ static void idetape_get_mode_sense_results(ide_drive_t *drive)
 {
 	idetape_tape_t *tape = drive->driver_data;
 	struct ide_atapi_pc pc;
-	u8 *caps;
+	u8 buf[24], *caps;
 	u8 speed, max_speed;
 
 	idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
-	if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
+	if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
 		printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
 				" some default values\n");
 		tape->blk_size = 512;
@@ -1656,7 +1648,7 @@ static void idetape_get_mode_sense_results(ide_drive_t *drive)
 		put_unaligned(6*52, (u16 *)&tape->caps[16]);
 		return;
 	}
-	caps = pc.buf + 4 + pc.buf[3];
+	caps = buf + 4 + buf[3];
 
 	/* convert to host order and save for later use */
 	speed = be16_to_cpup((__be16 *)&caps[14]);