scsi: Implement st_printk()

Update the st driver to use dev_printk() variants instead of
plain printk(); this will prefix logging messages with the
appropriate device.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 311 insertions, 294 deletions

diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 14eb4b256a03..aff9689de0f7 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -58,11 +58,11 @@ static const char *verstr = "20101219";
    is defined and non-zero. */
 #define DEBUG 0
 
+#define ST_DEB_MSG  KERN_NOTICE
 #if DEBUG
 /* The message level for the debug messages is currently set to KERN_NOTICE
    so that people can easily see the messages. Later when the debugging messages
    in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
-#define ST_DEB_MSG  KERN_NOTICE
 #define DEB(a) a
 #define DEBC(a) if (debugging) { a ; }
 #else
@@ -305,6 +305,15 @@ static inline char *tape_name(struct scsi_tape *tape)
 	return tape->disk->disk_name;
 }
 
+#define st_printk(prefix, t, fmt, a...) \
+	sdev_printk(prefix, (t)->device, "%s: " fmt, \
+		    tape_name(t), ##a)
+#ifdef DEBUG
+#define DEBC_printk(t, fmt, a...) \
+	if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
+#else
+#define DEBC_printk(t, fmt, a...)
+#endif
 
 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
 {
@@ -358,21 +367,20 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
 	else
 		scode = 0;
 
-        DEB(
-        if (debugging) {
-                printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
-		       name, result,
-		       SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
-		       SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
+	DEB(
+	if (debugging) {
+		st_printk(ST_DEB_MSG, STp,
+			    "Error: %x, cmd: %x %x %x %x %x %x\n", result,
+			    SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
+			    SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
 		if (cmdstatp->have_sense)
 			 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
 	} ) /* end DEB */
 	if (!debugging) { /* Abnormal conditions for tape */
 		if (!cmdstatp->have_sense)
-			printk(KERN_WARNING
-			       "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
-			       name, result, driver_byte(result),
-			       host_byte(result));
+			st_printk(KERN_WARNING, STp,
+			       "Error %x (driver bt 0x%x, host bt 0x%x).\n",
+			       result, driver_byte(result), host_byte(result));
 		else if (cmdstatp->have_sense &&
 			 scode != NO_SENSE &&
 			 scode != RECOVERED_ERROR &&
@@ -411,7 +419,7 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
 		STp->recover_count++;
 		STp->recover_reg++;
 
-                DEB(
+		DEB(
 		if (debugging) {
 			if (SRpnt->cmd[0] == READ_6)
 				stp = "read";
@@ -419,8 +427,9 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
 				stp = "write";
 			else
 				stp = "ioctl";
-			printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp,
-			       STp->recover_count);
+			st_printk(ST_DEB_MSG, STp,
+				  "Recovered %s error (%d).\n",
+				  stp, STp->recover_count);
 		} ) /* end DEB */
 
 		if (cmdstatp->flags == 0)
@@ -437,8 +446,8 @@ static struct st_request *st_allocate_request(struct scsi_tape *stp)
 	if (streq)
 		streq->stp = stp;
 	else {
-		DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
-			    tape_name(stp)););
+		st_printk(KERN_ERR, stp,
+			  "Can't get SCSI request.\n");
 		if (signal_pending(current))
 			stp->buffer->syscall_result = -EINTR;
 		else
@@ -525,8 +534,8 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
 
 	/* if async, make sure there's no command outstanding */
 	if (!do_wait && ((STp->buffer)->last_SRpnt)) {
-		printk(KERN_ERR "%s: Async command already active.\n",
-		       tape_name(STp));
+		st_printk(KERN_ERR, STp,
+			  "Async command already active.\n");
 		if (signal_pending(current))
 			(STp->buffer)->syscall_result = (-EINTR);
 		else
@@ -597,12 +606,12 @@ static int write_behind_check(struct scsi_tape * STp)
 	if (!STbuffer->writing)
 		return 0;
 
-        DEB(
+	DEB(
 	if (STp->write_pending)
 		STp->nbr_waits++;
 	else
 		STp->nbr_finished++;
-        ) /* end DEB */
+	) /* end DEB */
 
 	wait_for_completion(&(STp->wait));
 	SRpnt = STbuffer->last_SRpnt;
@@ -639,8 +648,9 @@ static int write_behind_check(struct scsi_tape * STp)
 	STbuffer->writing = 0;
 
 	DEB(if (debugging && retval)
-	    printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n",
-		   tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
+		    st_printk(ST_DEB_MSG, STp,
+				"Async write error %x, return value %d.\n",
+				STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
 
 	return retval;
 }
@@ -662,8 +672,8 @@ static int cross_eof(struct scsi_tape * STp, int forward)
 		cmd[2] = cmd[3] = cmd[4] = 0xff;	/* -1 filemarks */
 	cmd[5] = 0;
 
-        DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
-		   tape_name(STp), forward ? "forward" : "backward"));
+	DEBC_printk(STp, "Stepping over filemark %s.\n",
+		    forward ? "forward" : "backward");
 
 	SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
 			   STp->device->request_queue->rq_timeout,
@@ -675,8 +685,9 @@ static int cross_eof(struct scsi_tape * STp, int forward)
 	SRpnt = NULL;
 
 	if ((STp->buffer)->cmdstat.midlevel_result != 0)
-		printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
-		   tape_name(STp), forward ? "forward" : "backward");
+		st_printk(KERN_ERR, STp,
+			  "Stepping over filemark %s failed.\n",
+			  forward ? "forward" : "backward");
 
 	return (STp->buffer)->syscall_result;
 }
@@ -699,8 +710,7 @@ static int st_flush_write_buffer(struct scsi_tape * STp)
 	if (STp->dirty == 1) {
 
 		transfer = STp->buffer->buffer_bytes;
-                DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
-                               tape_name(STp), transfer));
+		DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
 
 		memset(cmd, 0, MAX_COMMAND_SIZE);
 		cmd[0] = WRITE_6;
@@ -732,8 +742,7 @@ static int st_flush_write_buffer(struct scsi_tape * STp)
 					STps->drv_block += blks;
 				result = (-ENOSPC);
 			} else {
-				printk(KERN_ERR "%s: Error on flush.\n",
-                                       tape_name(STp));
+				st_printk(KERN_ERR, STp, "Error on flush.\n");
 				STps->drv_block = (-1);
 				result = (-EIO);
 			}
@@ -811,7 +820,6 @@ static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
 {
 	int set_it = 0;
 	unsigned long arg;
-	char *name = tape_name(STp);
 
 	if (!STp->density_changed &&
 	    STm->default_density >= 0 &&
@@ -830,9 +838,10 @@ static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
 		arg |= STp->block_size;
 	if (set_it &&
 	    st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
-		printk(KERN_WARNING
-		       "%s: Can't set default block size to %d bytes and density %x.\n",
-		       name, STm->default_blksize, STm->default_density);
+		st_printk(KERN_WARNING, STp,
+			  "Can't set default block size to %d bytes "
+			  "and density %x.\n",
+			  STm->default_blksize, STm->default_density);
 		if (modes_defined)
 			return (-EINVAL);
 	}
@@ -844,12 +853,9 @@ static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
 static int do_door_lock(struct scsi_tape * STp, int do_lock)
 {
 	int retval, cmd;
-	DEB(char *name = tape_name(STp);)
-
 
 	cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
-	DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name,
-		    do_lock ? "L" : "Unl"));
+	DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
 	retval = scsi_ioctl(STp->device, cmd, NULL);
 	if (!retval) {
 		STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
@@ -976,15 +982,14 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
 	struct st_request *SRpnt = NULL;
 	struct st_modedef *STm;
 	struct st_partstat *STps;
-	char *name = tape_name(STp);
 	struct inode *inode = file_inode(filp);
 	int mode = TAPE_MODE(inode);
 
 	STp->ready = ST_READY;
 
 	if (mode != STp->current_mode) {
-                DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n",
-			       name, STp->current_mode, mode));
+		DEBC_printk(STp, "Mode change from %d to %d.\n",
+			    STp->current_mode, mode);
 		new_session = 1;
 		STp->current_mode = mode;
 	}
@@ -1055,13 +1060,12 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
 			STp->min_block = ((STp->buffer)->b_data[4] << 8) |
 			    (STp->buffer)->b_data[5];
 			if ( DEB( debugging || ) !STp->inited)
-				printk(KERN_INFO
-                                       "%s: Block limits %d - %d bytes.\n", name,
-                                       STp->min_block, STp->max_block);
+				st_printk(KERN_INFO, STp,
+					  "Block limits %d - %d bytes.\n",
+					  STp->min_block, STp->max_block);
 		} else {
 			STp->min_block = STp->max_block = (-1);
-                        DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n",
-                                       name));
+			DEBC_printk(STp, "Can't read block limits.\n");
 		}
 	}
 
@@ -1078,56 +1082,58 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
 	}
 
 	if ((STp->buffer)->syscall_result != 0) {
-                DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name));
+		DEBC_printk(STp, "No Mode Sense.\n");
 		STp->block_size = ST_DEFAULT_BLOCK;	/* Educated guess (?) */
 		(STp->buffer)->syscall_result = 0;	/* Prevent error propagation */
 		STp->drv_write_prot = 0;
 	} else {
-                DEBC(printk(ST_DEB_MSG
-                            "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n",
-                            name,
-                            (STp->buffer)->b_data[0], (STp->buffer)->b_data[1],
-                            (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]));
+		DEBC_printk(STp,"Mode sense. Length %d, "
+			    "medium %x, WBS %x, BLL %d\n",
+			    (STp->buffer)->b_data[0],
+			    (STp->buffer)->b_data[1],
+			    (STp->buffer)->b_data[2],
+			    (STp->buffer)->b_data[3]);
 
 		if ((STp->buffer)->b_data[3] >= 8) {
 			STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
 			STp->density = (STp->buffer)->b_data[4];
 			STp->block_size = (STp->buffer)->b_data[9] * 65536 +
 			    (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
-                        DEBC(printk(ST_DEB_MSG
-                                    "%s: Density %x, tape length: %x, drv buffer: %d\n",
-                                    name, STp->density, (STp->buffer)->b_data[5] * 65536 +
-                                    (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7],
-                                    STp->drv_buffer));
+			DEBC_printk(STp, "Density %x, tape length: %x, "
+				    "drv buffer: %d\n",
+				    STp->density,
+				    (STp->buffer)->b_data[5] * 65536 +
+				    (STp->buffer)->b_data[6] * 256 +
+				    (STp->buffer)->b_data[7],
+				    STp->drv_buffer);
 		}
 		STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
 		if (!STp->drv_buffer && STp->immediate_filemark) {
-			printk(KERN_WARNING
-			    "%s: non-buffered tape: disabling writing immediate filemarks\n",
-			    name);
+			st_printk(KERN_WARNING, STp,
+				  "non-buffered tape: disabling "
+				  "writing immediate filemarks\n");
 			STp->immediate_filemark = 0;
 		}
 	}
 	st_release_request(SRpnt);
 	SRpnt = NULL;
-        STp->inited = 1;
+	STp->inited = 1;
 
 	if (STp->block_size > 0)
 		(STp->buffer)->buffer_blocks =
-                        (STp->buffer)->buffer_size / STp->block_size;
+			(STp->buffer)->buffer_size / STp->block_size;
 	else
 		(STp->buffer)->buffer_blocks = 1;
 	(STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
 
-        DEBC(printk(ST_DEB_MSG
-                       "%s: Block size: %d, buffer size: %d (%d blocks).\n", name,
-		       STp->block_size, (STp->buffer)->buffer_size,
-		       (STp->buffer)->buffer_blocks));
+	DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
+		    STp->block_size, (STp->buffer)->buffer_size,
+		    (STp->buffer)->buffer_blocks);
 
 	if (STp->drv_write_prot) {
 		STp->write_prot = 1;
 
-                DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name));
+		DEBC_printk(STp, "Write protected\n");
 
 		if (do_wait &&
 		    ((st_flags & O_ACCMODE) == O_WRONLY ||
@@ -1141,8 +1147,7 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
 		/* This code is reached when the device is opened for the first time
 		   after the driver has been initialized with tape in the drive and the
 		   partition support has been enabled. */
-                DEBC(printk(ST_DEB_MSG
-                            "%s: Updating partition number in status.\n", name));
+		DEBC_printk(STp, "Updating partition number in status.\n");
 		if ((STp->partition = find_partition(STp)) < 0) {
 			retval = STp->partition;
 			goto err_out;
@@ -1160,9 +1165,10 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
 
 		if (STp->default_drvbuffer != 0xff) {
 			if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
-				printk(KERN_WARNING
-                                       "%s: Can't set default drive buffering to %d.\n",
-				       name, STp->default_drvbuffer);
+				st_printk(KERN_WARNING, STp,
+					  "Can't set default drive "
+					  "buffering to %d.\n",
+					  STp->default_drvbuffer);
 		}
 	}
 
@@ -1182,7 +1188,6 @@ static int st_open(struct inode *inode, struct file *filp)
 	struct scsi_tape *STp;
 	struct st_partstat *STps;
 	int dev = TAPE_NR(inode);
-	char *name;
 
 	/*
 	 * We really want to do nonseekable_open(inode, filp); here, but some
@@ -1196,13 +1201,12 @@ static int st_open(struct inode *inode, struct file *filp)
 	}
 
 	filp->private_data = STp;
-	name = tape_name(STp);
 
 	spin_lock(&st_use_lock);
 	if (STp->in_use) {
 		spin_unlock(&st_use_lock);
 		scsi_tape_put(STp);
-		DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
+		DEBC_printk(STp, "Device already in use.\n");
 		return (-EBUSY);
 	}
 
@@ -1222,8 +1226,8 @@ static int st_open(struct inode *inode, struct file *filp)
 
 	/* See that we have at least a one page buffer available */
 	if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
-		printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n",
-		       name);
+		st_printk(KERN_WARNING, STp,
+			  "Can't allocate one page tape buffer.\n");
 		retval = (-EOVERFLOW);
 		goto err_out;
 	}
@@ -1279,7 +1283,6 @@ static int st_flush(struct file *filp, fl_owner_t id)
 	struct scsi_tape *STp = filp->private_data;
 	struct st_modedef *STm = &(STp->modes[STp->current_mode]);
 	struct st_partstat *STps = &(STp->ps[STp->partition]);
-	char *name = tape_name(STp);
 
 	if (file_count(filp) > 1)
 		return 0;
@@ -1292,24 +1295,25 @@ static int st_flush(struct file *filp, fl_owner_t id)
 
 	if (STp->can_partitions &&
 	    (result2 = switch_partition(STp)) < 0) {
-                DEBC(printk(ST_DEB_MSG
-                               "%s: switch_partition at close failed.\n", name));
+		DEBC_printk(STp, "switch_partition at close failed.\n");
 		if (result == 0)
 			result = result2;
 		goto out;
 	}
 
 	DEBC( if (STp->nbr_requests)
-		printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n",
-		       name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages));
+		st_printk(KERN_DEBUG, STp,
+			  "Number of r/w requests %d, dio used in %d, "
+			  "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
+			  STp->nbr_pages));
 
 	if (STps->rw == ST_WRITING && !STp->pos_unknown) {
 		struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
 
-                DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n",
-                            name, STp->nbr_waits, STp->nbr_finished);
-		)
-
+#if DEBUG
+		DEBC_printk(STp, "Async write waits %d, finished %d.\n",
+			    STp->nbr_waits, STp->nbr_finished);
+#endif
 		memset(cmd, 0, MAX_COMMAND_SIZE);
 		cmd[0] = WRITE_FILEMARKS;
 		if (STp->immediate_filemark)
@@ -1343,13 +1347,13 @@ static int st_flush(struct file *filp, fl_owner_t id)
 		else { /* Write error */
 			st_release_request(SRpnt);
 			SRpnt = NULL;
-			printk(KERN_ERR "%s: Error on write filemark.\n", name);
+			st_printk(KERN_ERR, STp,
+				  "Error on write filemark.\n");
 			if (result == 0)
 				result = (-EIO);
 		}
 
-                DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n",
-                            name, cmd[4]));
+		DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
 	} else if (!STp->rew_at_close) {
 		STps = &(STp->ps[STp->partition]);
 		if (!STm->sysv || STps->rw != ST_READING) {
@@ -1447,9 +1451,10 @@ static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
 	if (count == 0)
 		goto out;
 
-        DEB(
+	DEB(
 	if (!STp->in_use) {
-		printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp));
+		st_printk(ST_DEB_MSG, STp,
+			  "Incorrect device.\n");
 		retval = (-EIO);
 		goto out;
 	} ) /* end DEB */
@@ -1519,8 +1524,9 @@ static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
 
 		if (bufsize > STbp->buffer_size &&
 		    !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
-			printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
-			       tape_name(STp), bufsize);
+			st_printk(KERN_WARNING, STp,
+				  "Can't allocate %d byte tape buffer.\n",
+				  bufsize);
 			retval = (-EOVERFLOW);
 			goto out;
 		}
@@ -1563,7 +1569,6 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 	struct st_modedef *STm;
 	struct st_partstat *STps;
 	struct st_buffer *STbp;
-	char *name = tape_name(STp);
 
 	if (mutex_lock_interruptible(&STp->lock))
 		return -ERESTARTSYS;
@@ -1574,8 +1579,8 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 
 	/* Write must be integral number of blocks */
 	if (STp->block_size != 0 && (count % STp->block_size) != 0) {
-		printk(KERN_WARNING "%s: Write not multiple of tape block size.\n",
-		       name);
+		st_printk(KERN_WARNING, STp,
+			  "Write not multiple of tape block size.\n");
 		retval = (-EINVAL);
 		goto out;
 	}
@@ -1601,8 +1606,8 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 		if (STm->default_compression != ST_DONT_TOUCH &&
 		    !(STp->compression_changed)) {
 			if (st_compression(STp, (STm->default_compression == ST_YES))) {
-				printk(KERN_WARNING "%s: Can't set default compression.\n",
-				       name);
+				st_printk(KERN_WARNING, STp,
+					  "Can't set default compression.\n");
 				if (modes_defined) {
 					retval = (-EINVAL);
 					goto out;
@@ -1723,7 +1728,7 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 		if (STbp->syscall_result != 0) {
 			struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
 
-                        DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name));
+			DEBC_printk(STp, "Error on write:\n");
 			if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
 				scode = cmdstatp->sense_hdr.sense_key;
 				if (cmdstatp->remainder_valid)
@@ -1750,9 +1755,9 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 					if (STp->block_size == 0 ||
 					    undone > 0 || count == 0)
 						retval = (-ENOSPC); /* EOM within current request */
-                                        DEBC(printk(ST_DEB_MSG
-                                                       "%s: EOM with %d bytes unwritten.\n",
-						       name, (int)count));
+					DEBC_printk(STp, "EOM with %d "
+						    "bytes unwritten.\n",
+						    (int)count);
 				} else {
 					/* EOT within data buffered earlier (possible only
 					   in fixed block mode without direct i/o) */
@@ -1765,9 +1770,10 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 								STp->block_size;
 						}
 						STps->eof = ST_EOM_OK;
-						DEBC(printk(ST_DEB_MSG
-							    "%s: Retry write of %d bytes at EOM.\n",
-							    name, STp->buffer->buffer_bytes));
+						DEBC_printk(STp, "Retry "
+							    "write of %d "
+							    "bytes at EOM.\n",
+							    STp->buffer->buffer_bytes);
 						goto retry_write;
 					}
 					else {
@@ -1778,9 +1784,8 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 						STps->eof = ST_EOM_ERROR;
 						STps->drv_block = (-1); /* Too cautious? */
 						retval = (-EIO);	/* EOM for old data */
-						DEBC(printk(ST_DEB_MSG
-							    "%s: EOM with lost data.\n",
-							    name));
+						DEBC_printk(STp, "EOM with "
+							    "lost data.\n");
 					}
 				}
 			} else {
@@ -1839,7 +1844,6 @@ static long read_tape(struct scsi_tape *STp, long count,
 	struct st_partstat *STps;
 	struct st_buffer *STbp;
 	int retval = 0;
-	char *name = tape_name(STp);
 
 	if (count == 0)
 		return 0;
@@ -1891,12 +1895,12 @@ static long read_tape(struct scsi_tape *STp, long count,
 		struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
 
 		retval = 1;
-		DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
-                            name,
-                            SRpnt->sense[0], SRpnt->sense[1],
-                            SRpnt->sense[2], SRpnt->sense[3],
-                            SRpnt->sense[4], SRpnt->sense[5],
-                            SRpnt->sense[6], SRpnt->sense[7]));
+		DEBC_printk(STp,
+			    "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
+			    SRpnt->sense[0], SRpnt->sense[1],
+			    SRpnt->sense[2], SRpnt->sense[3],
+			    SRpnt->sense[4], SRpnt->sense[5],
+			    SRpnt->sense[6], SRpnt->sense[7]);
 		if (cmdstatp->have_sense) {
 
 			if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
@@ -1913,23 +1917,27 @@ static long read_tape(struct scsi_tape *STp, long count,
 					transfer = bytes;
 
 				if (cmdstatp->flags & SENSE_ILI) {	/* ILI */
-					if (STp->block_size == 0) {
-						if (transfer <= 0) {
-							if (transfer < 0)
-								printk(KERN_NOTICE
-								       "%s: Failed to read %d byte block with %d byte transfer.\n",
-								       name, bytes - transfer, bytes);
-							if (STps->drv_block >= 0)
-								STps->drv_block += 1;
-							STbp->buffer_bytes = 0;
-							return (-ENOMEM);
-						}
+					if (STp->block_size == 0 &&
+					    transfer < 0) {
+						st_printk(KERN_NOTICE, STp,
+							  "Failed to read %d "
+							  "byte block with %d "
+							  "byte transfer.\n",
+							  bytes - transfer,
+							  bytes);
+						if (STps->drv_block >= 0)
+							STps->drv_block += 1;
+						STbp->buffer_bytes = 0;
+						return (-ENOMEM);
+					} else if (STp->block_size == 0) {
 						STbp->buffer_bytes = bytes - transfer;
 					} else {
 						st_release_request(SRpnt);
 						SRpnt = *aSRpnt = NULL;
 						if (transfer == blks) {	/* We did not get anything, error */
-							printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
+							st_printk(KERN_NOTICE, STp,
+								  "Incorrect "
+								  "block size.\n");
 							if (STps->drv_block >= 0)
 								STps->drv_block += blks - transfer + 1;
 							st_int_ioctl(STp, MTBSR, 1);
@@ -1938,9 +1946,11 @@ static long read_tape(struct scsi_tape *STp, long count,
 						/* We have some data, deliver it */
 						STbp->buffer_bytes = (blks - transfer) *
 						    STp->block_size;
-                                                DEBC(printk(ST_DEB_MSG
-                                                            "%s: ILI but enough data received %ld %d.\n",
-                                                            name, count, STbp->buffer_bytes));
+						DEBC_printk(STp, "ILI but "
+							    "enough data "
+							    "received %ld "
+							    "%d.\n", count,
+							    STbp->buffer_bytes);
 						if (STps->drv_block >= 0)
 							STps->drv_block += 1;
 						if (st_int_ioctl(STp, MTBSR, 1))
@@ -1956,9 +1966,9 @@ static long read_tape(struct scsi_tape *STp, long count,
 					else
 						STbp->buffer_bytes =
 						    bytes - transfer * STp->block_size;
-                                        DEBC(printk(ST_DEB_MSG
-                                                    "%s: EOF detected (%d bytes read).\n",
-                                                    name, STbp->buffer_bytes));
+					DEBC_printk(STp, "EOF detected (%d "
+						    "bytes read).\n",
+						    STbp->buffer_bytes);
 				} else if (cmdstatp->flags & SENSE_EOM) {
 					if (STps->eof == ST_FM)
 						STps->eof = ST_EOD_1;
@@ -1970,20 +1980,20 @@ static long read_tape(struct scsi_tape *STp, long count,
 						STbp->buffer_bytes =
 						    bytes - transfer * STp->block_size;
 
-                                        DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n",
-                                                    name, STbp->buffer_bytes));
+					DEBC_printk(STp, "EOM detected (%d "
+						    "bytes read).\n",
+						    STbp->buffer_bytes);
 				}
 			}
-			/* end of EOF, EOM, ILI test */ 
+			/* end of EOF, EOM, ILI test */
 			else {	/* nonzero sense key */
-                                DEBC(printk(ST_DEB_MSG
-                                            "%s: Tape error while reading.\n", name));
+				DEBC_printk(STp, "Tape error while reading.\n");
 				STps->drv_block = (-1);
 				if (STps->eof == ST_FM &&
 				    cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
-                                        DEBC(printk(ST_DEB_MSG
-                                                    "%s: Zero returned for first BLANK CHECK after EOF.\n",
-                                                    name));
+					DEBC_printk(STp, "Zero returned for "
+						    "first BLANK CHECK "
+						    "after EOF.\n");
 					STps->eof = ST_EOD_2;	/* First BLANK_CHECK after FM */
 				} else	/* Some other extended sense code */
 					retval = (-EIO);
@@ -1992,13 +2002,13 @@ static long read_tape(struct scsi_tape *STp, long count,
 			if (STbp->buffer_bytes < 0)  /* Caused by bogus sense data */
 				STbp->buffer_bytes = 0;
 		}
-		/* End of extended sense test */ 
+		/* End of extended sense test */
 		else {		/* Non-extended sense */
 			retval = STbp->syscall_result;
 		}
 
 	}
-	/* End of error handling */ 
+	/* End of error handling */
 	else {			/* Read successful */
 		STbp->buffer_bytes = bytes;
 		if (STp->sili) /* In fixed block mode residual is always zero here */
@@ -2028,7 +2038,6 @@ st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
 	struct st_modedef *STm;
 	struct st_partstat *STps;
 	struct st_buffer *STbp = STp->buffer;
-	DEB( char *name = tape_name(STp); )
 
 	if (mutex_lock_interruptible(&STp->lock))
 		return -ERESTARTSYS;
@@ -2053,11 +2062,12 @@ st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
 			goto out;
 		STps->rw = ST_READING;
 	}
-        DEB(
+	DEB(
 	if (debugging && STps->eof != ST_NOEOF)
-		printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name,
-		       STps->eof, STbp->buffer_bytes);
-        ) /* end DEB */
+		st_printk(ST_DEB_MSG, STp,
+			  "EOF/EOM flag up (%d). Bytes %d\n",
+			  STps->eof, STbp->buffer_bytes);
+	) /* end DEB */
 
 	retval = setup_buffering(STp, buf, count, 1);
 	if (retval)
@@ -2104,13 +2114,13 @@ st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
 
 		/* Move the data from driver buffer to user buffer */
 		if (STbp->buffer_bytes > 0) {
-                        DEB(
+			DEB(
 			if (debugging && STps->eof != ST_NOEOF)
-				printk(ST_DEB_MSG
-                                       "%s: EOF up (%d). Left %d, needed %d.\n", name,
-				       STps->eof, STbp->buffer_bytes,
-                                       (int)(count - total));
-                        ) /* end DEB */
+				st_printk(ST_DEB_MSG, STp,
+					  "EOF up (%d). Left %d, needed %d.\n",
+					  STps->eof, STbp->buffer_bytes,
+					  (int)(count - total));
+			) /* end DEB */
 			transfer = STbp->buffer_bytes < count - total ?
 			    STbp->buffer_bytes : count - total;
 			if (!do_dio) {
@@ -2166,26 +2176,30 @@ st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
 
 DEB(
 /* Set the driver options */
-static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name)
+static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
 {
 	if (debugging) {
-		printk(KERN_INFO
-		       "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
-		       name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
-		       STm->do_read_ahead);
-		printk(KERN_INFO
-		       "%s:    can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
-		       name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
-		printk(KERN_INFO
-		       "%s:    defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
-		       name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
-		       STp->scsi2_logical);
-		printk(KERN_INFO
-		       "%s:    sysv: %d nowait: %d sili: %d nowait_filemark: %d\n",
-		       name, STm->sysv, STp->immediate, STp->sili,
-		       STp->immediate_filemark);
-		printk(KERN_INFO "%s:    debugging: %d\n",
-		       name, debugging);
+		st_printk(KERN_INFO, STp,
+			  "Mode %d options: buffer writes: %d, "
+			  "async writes: %d, read ahead: %d\n",
+			  STp->current_mode, STm->do_buffer_writes,
+			  STm->do_async_writes, STm->do_read_ahead);
+		st_printk(KERN_INFO, STp,
+			  "    can bsr: %d, two FMs: %d, "
+			  "fast mteom: %d, auto lock: %d,\n",
+			  STp->can_bsr, STp->two_fm, STp->fast_mteom,
+			  STp->do_auto_lock);
+		st_printk(KERN_INFO, STp,
+			  "    defs for wr: %d, no block limits: %d, "
+			  "partitions: %d, s2 log: %d\n",
+			  STm->defaults_for_writes, STp->omit_blklims,
+			  STp->can_partitions, STp->scsi2_logical);
+		st_printk(KERN_INFO, STp,
+			  "    sysv: %d nowait: %d sili: %d "
+			  "nowait_filemark: %d\n",
+			  STm->sysv, STp->immediate, STp->sili,
+			  STp->immediate_filemark);
+		st_printk(KERN_INFO, STp, "    debugging: %d\n", debugging);
 	}
 }
 	)
@@ -2196,7 +2210,6 @@ static int st_set_options(struct scsi_tape *STp, long options)
 	int value;
 	long code;
 	struct st_modedef *STm;
-	char *name = tape_name(STp);
 	struct cdev *cd0, *cd1;
 	struct device *d0, *d1;
 
@@ -2212,9 +2225,8 @@ static int st_set_options(struct scsi_tape *STp, long options)
 		STm->devs[0]  = d0;
 		STm->devs[1]  = d1;
 		modes_defined = 1;
-                DEBC(printk(ST_DEB_MSG
-                            "%s: Initialized mode %d definition from mode 0\n",
-                            name, STp->current_mode));
+		DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
+			    STp->current_mode);
 	}
 
 	code = options & MT_ST_OPTIONS;
@@ -2236,7 +2248,7 @@ static int st_set_options(struct scsi_tape *STp, long options)
 		STm->sysv = (options & MT_ST_SYSV) != 0;
 		STp->sili = (options & MT_ST_SILI) != 0;
 		DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
-		     st_log_options(STp, STm, name); )
+		     st_log_options(STp, STm); )
 	} else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
 		value = (code == MT_ST_SETBOOLEANS);
 		if ((options & MT_ST_BUFFER_WRITES) != 0)
@@ -2270,21 +2282,21 @@ static int st_set_options(struct scsi_tape *STp, long options)
 			STm->sysv = value;
 		if ((options & MT_ST_SILI) != 0)
 			STp->sili = value;
-                DEB(
+		DEB(
 		if ((options & MT_ST_DEBUGGING) != 0)
 			debugging = value;
-			st_log_options(STp, STm, name); )
+			st_log_options(STp, STm); )
 	} else if (code == MT_ST_WRITE_THRESHOLD) {
 		/* Retained for compatibility */
 	} else if (code == MT_ST_DEF_BLKSIZE) {
 		value = (options & ~MT_ST_OPTIONS);
 		if (value == ~MT_ST_OPTIONS) {
 			STm->default_blksize = (-1);
-			DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name));
+			DEBC_printk(STp, "Default block size disabled.\n");
 		} else {
 			STm->default_blksize = value;
-			DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n",
-			       name, STm->default_blksize));
+			DEBC_printk(STp,"Default block size set to "
+				    "%d bytes.\n", STm->default_blksize);
 			if (STp->ready == ST_READY) {
 				STp->blksize_changed = 0;
 				set_mode_densblk(STp, STm);
@@ -2294,13 +2306,13 @@ static int st_set_options(struct scsi_tape *STp, long options)
 		value = (options & ~MT_ST_OPTIONS);
 		if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
 			STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
-			DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name,
-			       (value & ~MT_ST_SET_LONG_TIMEOUT)));
+			DEBC_printk(STp, "Long timeout set to %d seconds.\n",
+				    (value & ~MT_ST_SET_LONG_TIMEOUT));
 		} else {
 			blk_queue_rq_timeout(STp->device->request_queue,
 					     value * HZ);
-			DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n",
-				name, value) );
+			DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
+				    value);
 		}
 	} else if (code == MT_ST_SET_CLN) {
 		value = (options & ~MT_ST_OPTIONS) & 0xff;
@@ -2311,21 +2323,21 @@ static int st_set_options(struct scsi_tape *STp, long options)
 		STp->cln_mode = value;
 		STp->cln_sense_mask = (options >> 8) & 0xff;
 		STp->cln_sense_value = (options >> 16) & 0xff;
-		printk(KERN_INFO
-		       "%s: Cleaning request mode %d, mask %02x, value %02x\n",
-		       name, value, STp->cln_sense_mask, STp->cln_sense_value);
+		st_printk(KERN_INFO, STp,
+			  "Cleaning request mode %d, mask %02x, value %02x\n",
+			  value, STp->cln_sense_mask, STp->cln_sense_value);
 	} else if (code == MT_ST_DEF_OPTIONS) {
 		code = (options & ~MT_ST_CLEAR_DEFAULT);
 		value = (options & MT_ST_CLEAR_DEFAULT);
 		if (code == MT_ST_DEF_DENSITY) {
 			if (value == MT_ST_CLEAR_DEFAULT) {
 				STm->default_density = (-1);
-				DEBC( printk(KERN_INFO "%s: Density default disabled.\n",
-                                       name));
+				DEBC_printk(STp,
+					    "Density default disabled.\n");
 			} else {
 				STm->default_density = value & 0xff;
-				DEBC( printk(KERN_INFO "%s: Density default set to %x\n",
-				       name, STm->default_density));
+				DEBC_printk(STp, "Density default set to %x\n",
+					    STm->default_density);
 				if (STp->ready == ST_READY) {
 					STp->density_changed = 0;
 					set_mode_densblk(STp, STm);
@@ -2334,31 +2346,33 @@ static int st_set_options(struct scsi_tape *STp, long options)
 		} else if (code == MT_ST_DEF_DRVBUFFER) {
 			if (value == MT_ST_CLEAR_DEFAULT) {
 				STp->default_drvbuffer = 0xff;
-				DEBC( printk(KERN_INFO
-                                       "%s: Drive buffer default disabled.\n", name));
+				DEBC_printk(STp,
+					    "Drive buffer default disabled.\n");
 			} else {
 				STp->default_drvbuffer = value & 7;
-				DEBC( printk(KERN_INFO
-                                       "%s: Drive buffer default set to %x\n",
-				       name, STp->default_drvbuffer));
+				DEBC_printk(STp,
+					    "Drive buffer default set to %x\n",
+					    STp->default_drvbuffer);
 				if (STp->ready == ST_READY)
 					st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
 			}
 		} else if (code == MT_ST_DEF_COMPRESSION) {
 			if (value == MT_ST_CLEAR_DEFAULT) {
 				STm->default_compression = ST_DONT_TOUCH;
-				DEBC( printk(KERN_INFO
-                                       "%s: Compression default disabled.\n", name));
+				DEBC_printk(STp,
+					    "Compression default disabled.\n");
 			} else {
 				if ((value & 0xff00) != 0) {
 					STp->c_algo = (value & 0xff00) >> 8;
-					DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n",
-					       name, STp->c_algo));
+					DEBC_printk(STp, "Compression "
+						    "algorithm set to 0x%x.\n",
+						    STp->c_algo);
 				}
 				if ((value & 0xff) != 0xff) {
 					STm->default_compression = (value & 1 ? ST_YES : ST_NO);
-					DEBC( printk(KERN_INFO "%s: Compression default set to %x\n",
-					       name, (value & 1)));
+					DEBC_printk(STp, "Compression default "
+						    "set to %x\n",
+						    (value & 1));
 					if (STp->ready == ST_READY) {
 						STp->compression_changed = 0;
 						st_compression(STp, (STm->default_compression == ST_YES));
@@ -2473,7 +2487,6 @@ static int st_compression(struct scsi_tape * STp, int state)
 	int retval;
 	int mpoffs;  /* Offset to mode page start */
 	unsigned char *b_data = (STp->buffer)->b_data;
-	DEB( char *name = tape_name(STp); )
 
 	if (STp->ready != ST_READY)
 		return (-EIO);
@@ -2481,18 +2494,17 @@ static int st_compression(struct scsi_tape * STp, int state)
 	/* Read the current page contents */
 	retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
 	if (retval) {
-                DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n",
-                            name));
+		DEBC_printk(STp, "Compression mode page not supported.\n");
 		return (-EIO);
 	}
 
 	mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
-        DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name,
-                    (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)));
+	DEBC_printk(STp, "Compression state is %d.\n",
+		    (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
 
 	/* Check if compression can be changed */
 	if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
-                DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name));
+		DEBC_printk(STp, "Compression not supported.\n");
 		return (-EIO);
 	}
 
@@ -2510,11 +2522,10 @@ static int st_compression(struct scsi_tape * STp, int state)
 
 	retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
 	if (retval) {
-                DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name));
+		DEBC_printk(STp, "Compression change failed.\n");
 		return (-EIO);
 	}
-        DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n",
-		       name, state));
+	DEBC_printk(STp, "Compression state changed to %d.\n", state);
 
 	STp->compression_changed = 1;
 	return 0;
@@ -2525,7 +2536,6 @@ static int st_compression(struct scsi_tape * STp, int state)
 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
 {
 	int retval = (-EIO), timeout;
-	DEB( char *name = tape_name(STp); )
 	unsigned char cmd[MAX_COMMAND_SIZE];
 	struct st_partstat *STps;
 	struct st_request *SRpnt;
@@ -2546,9 +2556,9 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod
 	 */
 	if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
 	    && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
-		DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n",
-			    name, (cmd[4]) ? "" : "un",
-			    load_code - MT_ST_HPLOADER_OFFSET));
+		DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
+			    (cmd[4]) ? "" : "un",
+			    load_code - MT_ST_HPLOADER_OFFSET);
 		cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
 	}
 	if (STp->immediate) {
@@ -2560,9 +2570,9 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod
 
 	DEBC(
 		if (!load_code)
-		printk(ST_DEB_MSG "%s: Unloading tape.\n", name);
+			st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
 		else
-		printk(ST_DEB_MSG "%s: Loading tape.\n", name);
+			st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
 		);
 
 	SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
@@ -2597,17 +2607,24 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod
 #if DEBUG
 #define ST_DEB_FORWARD  0
 #define ST_DEB_BACKWARD 1
-static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd)
+static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
 {
 	s32 sc;
 
+	if (!debugging)
+		return;
+
 	sc = cmd[2] & 0x80 ? 0xff000000 : 0;
 	sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
 	if (direction)
 		sc = -sc;
-	printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name,
-	       direction ? "backward" : "forward", sc, units);
+	st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
+		  direction ? "backward" : "forward", sc, units);
 }
+#else
+#define ST_DEB_FORWARD  0
+#define ST_DEB_BACKWARD 1
+static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
 #endif
 
 
@@ -2623,7 +2640,6 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 	struct st_partstat *STps;
 	int fileno, blkno, at_sm, undone;
 	int datalen = 0, direction = DMA_NONE;
-	char *name = tape_name(STp);
 
 	WARN_ON(STp->buffer->do_dio != 0);
 	if (STp->ready != ST_READY) {
@@ -2648,7 +2664,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		cmd[2] = (arg >> 16);
 		cmd[3] = (arg >> 8);
 		cmd[4] = arg;
-                DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);)
+		deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
 		if (fileno >= 0)
 			fileno += arg;
 		blkno = 0;
@@ -2663,7 +2679,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		cmd[2] = (ltmp >> 16);
 		cmd[3] = (ltmp >> 8);
 		cmd[4] = ltmp;
-                DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);)
+		deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
 		if (fileno >= 0)
 			fileno -= arg;
 		blkno = (-1);	/* We can't know the block number */
@@ -2675,7 +2691,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		cmd[2] = (arg >> 16);
 		cmd[3] = (arg >> 8);
 		cmd[4] = arg;
-                DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);)
+		deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
 		if (blkno >= 0)
 			blkno += arg;
 		at_sm &= (arg == 0);
@@ -2687,7 +2703,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		cmd[2] = (ltmp >> 16);
 		cmd[3] = (ltmp >> 8);
 		cmd[4] = ltmp;
-                DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);)
+		deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
 		if (blkno >= 0)
 			blkno -= arg;
 		at_sm &= (arg == 0);
@@ -2698,7 +2714,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		cmd[2] = (arg >> 16);
 		cmd[3] = (arg >> 8);
 		cmd[4] = arg;
-                DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);)
+		deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
 		if (arg != 0) {
 			blkno = fileno = (-1);
 			at_sm = 1;
@@ -2711,7 +2727,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		cmd[2] = (ltmp >> 16);
 		cmd[3] = (ltmp >> 8);
 		cmd[4] = ltmp;
-                DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);)
+		deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
 		if (arg != 0) {
 			blkno = fileno = (-1);
 			at_sm = 1;
@@ -2732,13 +2748,19 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		cmd[3] = (arg >> 8);
 		cmd[4] = arg;
 		timeout = STp->device->request_queue->rq_timeout;
-                DEBC(
-		     if (cmd_in != MTWSM)
-                               printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
-				 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
-                     else
-				printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name,
-				 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
+		DEBC(
+			if (cmd_in != MTWSM)
+				st_printk(ST_DEB_MSG, STp,
+					  "Writing %d filemarks.\n",
+					  cmd[2] * 65536 +
+					  cmd[3] * 256 +
+					  cmd[4]);
+			else
+				st_printk(ST_DEB_MSG, STp,
+					  "Writing %d setmarks.\n",
+					  cmd[2] * 65536 +
+					  cmd[3] * 256 +
+					  cmd[4]);
 		)
 		if (fileno >= 0)
 			fileno += arg;
@@ -2751,11 +2773,11 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 			cmd[1] = 1;	/* Don't wait for completion */
 			timeout = STp->device->request_queue->rq_timeout;
 		}
-                DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name));
+		DEBC_printk(STp, "Rewinding tape.\n");
 		fileno = blkno = at_sm = 0;
 		break;
 	case MTNOP:
-                DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name));
+		DEBC_printk(STp, "No op on tape.\n");
 		return 0;	/* Should do something ? */
 		break;
 	case MTRETEN:
@@ -2765,7 +2787,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 			timeout = STp->device->request_queue->rq_timeout;
 		}
 		cmd[4] = 3;
-                DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name));
+		DEBC_printk(STp, "Retensioning tape.\n");
 		fileno = blkno = at_sm = 0;
 		break;
 	case MTEOM:
@@ -2783,8 +2805,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 			fileno = (-1);
 		cmd[0] = SPACE;
 		cmd[1] = 3;
-                DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n",
-                            name));
+		DEBC_printk(STp, "Spacing to end of recorded medium.\n");
 		blkno = -1;
 		at_sm = 0;
 		break;
@@ -2800,7 +2821,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		else
 			timeout = STp->long_timeout * 8;
 
-                DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name));
+		DEBC_printk(STp, "Erasing tape.\n");
 		fileno = blkno = at_sm = 0;
 		break;
 	case MTSETBLK:		/* Set block length */
@@ -2815,7 +2836,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		    STp->max_block > 0 &&
 		    ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
 		     (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
-			printk(KERN_WARNING "%s: Illegal block size.\n", name);
+			st_printk(KERN_WARNING, STp, "Illegal block size.\n");
 			return (-EINVAL);
 		}
 		cmd[0] = MODE_SELECT;
@@ -2848,21 +2869,21 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
 		(STp->buffer)->b_data[10] = (ltmp >> 8);
 		(STp->buffer)->b_data[11] = ltmp;
 		timeout = STp->device->request_queue->rq_timeout;
-                DEBC(
+		DEBC(
 			if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
-				printk(ST_DEB_MSG
-                                       "%s: Setting block size to %d bytes.\n", name,
-				       (STp->buffer)->b_data[9] * 65536 +
-				       (STp->buffer)->b_data[10] * 256 +
-				       (STp->buffer)->b_data[11]);
+				st_printk(ST_DEB_MSG, STp,
+					  "Setting block size to %d bytes.\n",
+					  (STp->buffer)->b_data[9] * 65536 +
+					  (STp->buffer)->b_data[10] * 256 +
+					  (STp->buffer)->b_data[11]);
 			if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
-				printk(ST_DEB_MSG
-                                       "%s: Setting density code to %x.\n", name,
-				       (STp->buffer)->b_data[4]);
+				st_printk(ST_DEB_MSG, STp,
+					  "Setting density code to %x.\n",
+					  (STp->buffer)->b_data[4]);
 			if (cmd_in == MTSETDRVBUFFER)
-				printk(ST_DEB_MSG
-                                       "%s: Setting drive buffer code to %d.\n", name,
-				    ((STp->buffer)->b_data[2] >> 4) & 7);
+				st_printk(ST_DEB_MSG, STp,
+					  "Setting drive buffer code to %d.\n",
+					  ((STp->buffer)->b_data[2] >> 4) & 7);
 		)
 		break;
 	default:
@@ -3019,7 +3040,6 @@ static int get_location(struct scsi_tape *STp, unsigned int *block, int *partiti
 	int result;
 	unsigned char scmd[MAX_COMMAND_SIZE];
 	struct st_request *SRpnt;
-	DEB( char *name = tape_name(STp); )
 
 	if (STp->ready != ST_READY)
 		return (-EIO);
@@ -3043,7 +3063,7 @@ static int get_location(struct scsi_tape *STp, unsigned int *block, int *partiti
 	    (STp->device->scsi_level >= SCSI_2 &&
 	     ((STp->buffer)->b_data[0] & 4) != 0)) {
 		*block = *partition = 0;
-                DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name));
+		DEBC_printk(STp, " Can't read tape position.\n");
 		result = (-EIO);
 	} else {
 		result = 0;
@@ -3062,8 +3082,8 @@ static int get_location(struct scsi_tape *STp, unsigned int *block, int *partiti
 			    (STp->buffer)->b_data[1] == 0)	/* BOP of partition 0 */
 				STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
 		}
-                DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
-                            *block, *partition));
+		DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
+			    *block, *partition);
 	}
 	st_release_request(SRpnt);
 	SRpnt = NULL;
@@ -3083,15 +3103,14 @@ static int set_location(struct scsi_tape *STp, unsigned int block, int partition
 	int timeout;
 	unsigned char scmd[MAX_COMMAND_SIZE];
 	struct st_request *SRpnt;
-	DEB( char *name = tape_name(STp); )
 
 	if (STp->ready != ST_READY)
 		return (-EIO);
 	timeout = STp->long_timeout;
 	STps = &(STp->ps[STp->partition]);
 
-        DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n",
-                    name, block, partition));
+	DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
+		    block, partition);
 	DEB(if (partition < 0)
 		return (-EIO); )
 
@@ -3105,9 +3124,9 @@ static int set_location(struct scsi_tape *STp, unsigned int block, int partition
 		else {
 			STps->last_block_valid = 1;
 			STps->last_block_visited = blk;
-                        DEBC(printk(ST_DEB_MSG
-                                    "%s: Visited block %d for partition %d saved.\n",
-                                    name, blk, STp->partition));
+			DEBC_printk(STp, "Visited block %d for "
+				    "partition %d saved.\n",
+				    blk, STp->partition);
 		}
 	}
 
@@ -3129,9 +3148,9 @@ static int set_location(struct scsi_tape *STp, unsigned int block, int partition
 		if (STp->partition != partition) {
 			scmd[1] |= 2;
 			scmd[8] = partition;
-                        DEBC(printk(ST_DEB_MSG
-                                    "%s: Trying to change partition from %d to %d\n",
-                                    name, STp->partition, partition));
+			DEBC_printk(STp, "Trying to change partition "
+				    "from %d to %d\n", STp->partition,
+				    partition);
 		}
 	}
 	if (STp->immediate) {
@@ -3222,7 +3241,6 @@ static int switch_partition(struct scsi_tape *STp)
 static int nbr_partitions(struct scsi_tape *STp)
 {
 	int result;
-	DEB( char *name = tape_name(STp); )
 
 	if (STp->ready != ST_READY)
 		return (-EIO);
@@ -3230,13 +3248,12 @@ static int nbr_partitions(struct scsi_tape *STp)
 	result = read_mode_page(STp, PART_PAGE, 1);
 
 	if (result) {
-                DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n",
-                            name));
+		DEBC_printk(STp, "Can't read medium partition page.\n");
 		result = (-EIO);
 	} else {
 		result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
 					      PP_OFF_NBR_ADD_PARTS] + 1;
-                DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result));
+		DEBC_printk(STp, "Number of partitions %d.\n", result);
 	}
 
 	return result;
@@ -3264,21 +3281,20 @@ static int nbr_partitions(struct scsi_tape *STp)
  */
 static int partition_tape(struct scsi_tape *STp, int size)
 {
-	char *name = tape_name(STp);
 	int result;
 	int pgo, psd_cnt, psdo;
 	unsigned char *bp;
 
 	result = read_mode_page(STp, PART_PAGE, 0);
 	if (result) {
-		DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name));
+		DEBC_printk(STp, "Can't read partition mode page.\n");
 		return result;
 	}
 	/* The mode page is in the buffer. Let's modify it and write it. */
 	bp = (STp->buffer)->b_data;
 	pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
-	DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n",
-		    name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2));
+	DEBC_printk(STp, "Partition page length is %d bytes.\n",
+		    bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
 
 	psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
 	psdo = pgo + PART_PAGE_FIXED_LENGTH;
@@ -3288,25 +3304,23 @@ static int partition_tape(struct scsi_tape *STp, int size)
 	}
 	memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
 
-	DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name,
+	DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
 		    psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
-		    bp[pgo + PP_OFF_NBR_ADD_PARTS]));
+		    bp[pgo + PP_OFF_NBR_ADD_PARTS]);
 
 	if (size <= 0) {
 		bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
 		if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
 		    bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
-                DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n",
-                            name));
+		DEBC_printk(STp, "Formatting tape with one partition.\n");
 	} else {
 		bp[psdo] = (size >> 8) & 0xff;
 		bp[psdo + 1] = size & 0xff;
 		bp[pgo + 3] = 1;
 		if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
 		    bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
-                DEBC(printk(ST_DEB_MSG
-                            "%s: Formatting tape with two partitions (1 = %d MB).\n",
-                            name, size));
+		DEBC_printk(STp, "Formatting tape with two partitions "
+			    "(1 = %d MB).\n", size);
 	}
 	bp[pgo + PP_OFF_PART_UNITS] = 0;
 	bp[pgo + PP_OFF_RESERVED] = 0;
@@ -3314,7 +3328,7 @@ static int partition_tape(struct scsi_tape *STp, int size)
 
 	result = write_mode_page(STp, PART_PAGE, 1);
 	if (result) {
-		printk(KERN_INFO "%s: Partitioning of tape failed.\n", name);
+		st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
 		result = (-EIO);
 	}
 
@@ -3332,15 +3346,14 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
 	struct scsi_tape *STp = file->private_data;
 	struct st_modedef *STm;
 	struct st_partstat *STps;
-	char *name = tape_name(STp);
 	void __user *p = (void __user *)arg;
 
 	if (mutex_lock_interruptible(&STp->lock))
 		return -ERESTARTSYS;
 
-        DEB(
+	DEB(
 	if (debugging && !STp->in_use) {
-		printk(ST_DEB_MSG "%s: Incorrect device.\n", name);
+		st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
 		retval = (-EIO);
 		goto out;
 	} ) /* end DEB */
@@ -3378,8 +3391,8 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
 		}
 
 		if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
-			printk(KERN_WARNING
-                               "%s: MTSETDRVBUFFER only allowed for root.\n", name);
+			st_printk(KERN_WARNING, STp,
+				  "MTSETDRVBUFFER only allowed for root.\n");
 			retval = (-EPERM);
 			goto out;
 		}
@@ -4087,7 +4100,8 @@ static int st_probe(struct device *dev)
 		return -ENODEV;
 	if ((stp = st_incompatible(SDp))) {
 		sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
-		printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
+		sdev_printk(KERN_INFO, SDp,
+			    "st: The suggested driver is %s.\n", stp);
 		return -ENODEV;
 	}
 
@@ -4096,20 +4110,23 @@ static int st_probe(struct device *dev)
 		i = st_max_sg_segs;
 	buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
 	if (buffer == NULL) {
-		printk(KERN_ERR
-		       "st: Can't allocate new tape buffer. Device not attached.\n");
+		sdev_printk(KERN_ERR, SDp,
+			    "st: Can't allocate new tape buffer. "
+			    "Device not attached.\n");
 		goto out;
 	}
 
 	disk = alloc_disk(1);
 	if (!disk) {
-		printk(KERN_ERR "st: out of memory. Device not attached.\n");
+		sdev_printk(KERN_ERR, SDp,
+			    "st: out of memory. Device not attached.\n");
 		goto out_buffer_free;
 	}
 
 	tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
 	if (tpnt == NULL) {
-		printk(KERN_ERR "st: Can't allocate device descriptor.\n");
+		sdev_printk(KERN_ERR, SDp,
+			    "st: Can't allocate device descriptor.\n");
 		goto out_put_disk;
 	}
 	kref_init(&tpnt->kref);