diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index 7b8a345..1591824 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -778,7 +778,7 @@
 		struct ScsiReqBlk *srb)
 {
 	dprintkdbg(DBG_0, "srb_waiting_insert: (pid#%li) <%02i-%i> srb=%p\n",
-		srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
+		srb->cmd->serial_number, dcb->target_id, dcb->target_lun, srb);
 	list_add(&srb->list, &dcb->srb_waiting_list);
 }
 
@@ -787,7 +787,7 @@
 		struct ScsiReqBlk *srb)
 {
 	dprintkdbg(DBG_0, "srb_waiting_append: (pid#%li) <%02i-%i> srb=%p\n",
-		 srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
+		 srb->cmd->serial_number, dcb->target_id, dcb->target_lun, srb);
 	list_add_tail(&srb->list, &dcb->srb_waiting_list);
 }
 
@@ -795,7 +795,7 @@
 static void srb_going_append(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
 {
 	dprintkdbg(DBG_0, "srb_going_append: (pid#%li) <%02i-%i> srb=%p\n",
-		srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
+		srb->cmd->serial_number, dcb->target_id, dcb->target_lun, srb);
 	list_add_tail(&srb->list, &dcb->srb_going_list);
 }
 
@@ -805,7 +805,7 @@
 	struct ScsiReqBlk *i;
 	struct ScsiReqBlk *tmp;
 	dprintkdbg(DBG_0, "srb_going_remove: (pid#%li) <%02i-%i> srb=%p\n",
-		srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
+		srb->cmd->serial_number, dcb->target_id, dcb->target_lun, srb);
 
 	list_for_each_entry_safe(i, tmp, &dcb->srb_going_list, list)
 		if (i == srb) {
@@ -821,7 +821,7 @@
 	struct ScsiReqBlk *i;
 	struct ScsiReqBlk *tmp;
 	dprintkdbg(DBG_0, "srb_waiting_remove: (pid#%li) <%02i-%i> srb=%p\n",
-		srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
+		srb->cmd->serial_number, dcb->target_id, dcb->target_lun, srb);
 
 	list_for_each_entry_safe(i, tmp, &dcb->srb_waiting_list, list)
 		if (i == srb) {
@@ -836,7 +836,7 @@
 {
 	dprintkdbg(DBG_0,
 		"srb_going_to_waiting_move: (pid#%li) <%02i-%i> srb=%p\n",
-		srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
+		srb->cmd->serial_number, dcb->target_id, dcb->target_lun, srb);
 	list_move(&srb->list, &dcb->srb_waiting_list);
 }
 
@@ -846,7 +846,7 @@
 {
 	dprintkdbg(DBG_0,
 		"srb_waiting_to_going_move: (pid#%li) <%02i-%i> srb=%p\n",
-		srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
+		srb->cmd->serial_number, dcb->target_id, dcb->target_lun, srb);
 	list_move(&srb->list, &dcb->srb_going_list);
 }
 
@@ -982,7 +982,7 @@
 	int nseg;
 	enum dma_data_direction dir = cmd->sc_data_direction;
 	dprintkdbg(DBG_0, "build_srb: (pid#%li) <%02i-%i>\n",
-		cmd->pid, dcb->target_id, dcb->target_lun);
+		cmd->serial_number, dcb->target_id, dcb->target_lun);
 
 	srb->dcb = dcb;
 	srb->cmd = cmd;
@@ -1086,7 +1086,7 @@
 	struct AdapterCtlBlk *acb =
 	    (struct AdapterCtlBlk *)cmd->device->host->hostdata;
 	dprintkdbg(DBG_0, "queue_command: (pid#%li) <%02i-%i> cmnd=0x%02x\n",
-		cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+		cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
 
 	/* Assume BAD_TARGET; will be cleared later */
 	cmd->result = DID_BAD_TARGET << 16;
@@ -1139,7 +1139,7 @@
 		/* process immediately */
 		send_srb(acb, srb);
 	}
-	dprintkdbg(DBG_1, "queue_command: (pid#%li) done\n", cmd->pid);
+	dprintkdbg(DBG_1, "queue_command: (pid#%li) done\n", cmd->serial_number);
 	return 0;
 
 complete:
@@ -1203,7 +1203,7 @@
 		else
 			dprintkl(KERN_INFO, "dump: srb=%p cmd=%p (pid#%li) "
 				 "cmnd=0x%02x <%02i-%i>\n",
-			    	srb, srb->cmd, srb->cmd->pid,
+				srb, srb->cmd, srb->cmd->serial_number,
 				srb->cmd->cmnd[0], srb->cmd->device->id,
 			       	srb->cmd->device->lun);
 		printk("  sglist=%p cnt=%i idx=%i len=%zu\n",
@@ -1300,7 +1300,7 @@
 		(struct AdapterCtlBlk *)cmd->device->host->hostdata;
 	dprintkl(KERN_INFO,
 		"eh_bus_reset: (pid#%li) target=<%02i-%i> cmd=%p\n",
-		cmd->pid, cmd->device->id, cmd->device->lun, cmd);
+		cmd->serial_number, cmd->device->id, cmd->device->lun, cmd);
 
 	if (timer_pending(&acb->waiting_timer))
 		del_timer(&acb->waiting_timer);
@@ -1367,7 +1367,7 @@
 	struct DeviceCtlBlk *dcb;
 	struct ScsiReqBlk *srb;
 	dprintkl(KERN_INFO, "eh_abort: (pid#%li) target=<%02i-%i> cmd=%p\n",
-		cmd->pid, cmd->device->id, cmd->device->lun, cmd);
+		cmd->serial_number, cmd->device->id, cmd->device->lun, cmd);
 
 	dcb = find_dcb(acb, cmd->device->id, cmd->device->lun);
 	if (!dcb) {
@@ -1494,7 +1494,7 @@
 	u8 s_stat, scsicommand, i, identify_message;
 	u8 *ptr;
 	dprintkdbg(DBG_0, "start_scsi: (pid#%li) <%02i-%i> srb=%p\n",
-		srb->cmd->pid, dcb->target_id, dcb->target_lun, srb);
+		srb->cmd->serial_number, dcb->target_id, dcb->target_lun, srb);
 
 	srb->tag_number = TAG_NONE;	/* acb->tag_max_num: had error read in eeprom */
 
@@ -1504,7 +1504,7 @@
 #if 1
 	if (s_stat & 0x20 /* s_stat2 & 0x02000 */ ) {
 		dprintkdbg(DBG_KG, "start_scsi: (pid#%li) BUSY %02x %04x\n",
-			srb->cmd->pid, s_stat, s_stat2);
+			srb->cmd->serial_number, s_stat, s_stat2);
 		/*
 		 * Try anyway?
 		 *
@@ -1522,14 +1522,14 @@
 	if (acb->active_dcb) {
 		dprintkl(KERN_DEBUG, "start_scsi: (pid#%li) Attempt to start a"
 			"command while another command (pid#%li) is active.",
-			srb->cmd->pid,
+			srb->cmd->serial_number,
 			acb->active_dcb->active_srb ?
-			    acb->active_dcb->active_srb->cmd->pid : 0);
+			    acb->active_dcb->active_srb->cmd->serial_number : 0);
 		return 1;
 	}
 	if (DC395x_read16(acb, TRM_S1040_SCSI_STATUS) & SCSIINTERRUPT) {
 		dprintkdbg(DBG_KG, "start_scsi: (pid#%li) Failed (busy)\n",
-			srb->cmd->pid);
+			srb->cmd->serial_number);
 		return 1;
 	}
 	/* Allow starting of SCSI commands half a second before we allow the mid-level
@@ -1603,7 +1603,7 @@
 		if (tag_number >= dcb->max_command) {
 			dprintkl(KERN_WARNING, "start_scsi: (pid#%li) "
 				"Out of tags target=<%02i-%i>)\n",
-				srb->cmd->pid, srb->cmd->device->id,
+				srb->cmd->serial_number, srb->cmd->device->id,
 				srb->cmd->device->lun);
 			srb->state = SRB_READY;
 			DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
@@ -1622,7 +1622,7 @@
 /*polling:*/
 	/* Send CDB ..command block ......... */
 	dprintkdbg(DBG_KG, "start_scsi: (pid#%li) <%02i-%i> cmnd=0x%02x tag=%i\n",
-		srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun,
+		srb->cmd->serial_number, srb->cmd->device->id, srb->cmd->device->lun,
 		srb->cmd->cmnd[0], srb->tag_number);
 	if (srb->flag & AUTO_REQSENSE) {
 		DC395x_write8(acb, TRM_S1040_SCSI_FIFO, REQUEST_SENSE);
@@ -1647,7 +1647,7 @@
 		 * : Let's process it first!
 		 */
 		dprintkdbg(DBG_0, "start_scsi: (pid#%li) <%02i-%i> Failed - busy\n",
-			srb->cmd->pid, dcb->target_id, dcb->target_lun);
+			srb->cmd->serial_number, dcb->target_id, dcb->target_lun);
 		srb->state = SRB_READY;
 		free_tag(dcb, srb);
 		srb->msg_count = 0;
@@ -1842,7 +1842,7 @@
 static void msgout_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
 		u16 *pscsi_status)
 {
-	dprintkdbg(DBG_0, "msgout_phase0: (pid#%li)\n", srb->cmd->pid);
+	dprintkdbg(DBG_0, "msgout_phase0: (pid#%li)\n", srb->cmd->serial_number);
 	if (srb->state & (SRB_UNEXPECT_RESEL + SRB_ABORT_SENT))
 		*pscsi_status = PH_BUS_FREE;	/*.. initial phase */
 
@@ -1856,18 +1856,18 @@
 {
 	u16 i;
 	u8 *ptr;
-	dprintkdbg(DBG_0, "msgout_phase1: (pid#%li)\n", srb->cmd->pid);
+	dprintkdbg(DBG_0, "msgout_phase1: (pid#%li)\n", srb->cmd->serial_number);
 
 	clear_fifo(acb, "msgout_phase1");
 	if (!(srb->state & SRB_MSGOUT)) {
 		srb->state |= SRB_MSGOUT;
 		dprintkl(KERN_DEBUG,
 			"msgout_phase1: (pid#%li) Phase unexpected\n",
-			srb->cmd->pid);	/* So what ? */
+			srb->cmd->serial_number);	/* So what ? */
 	}
 	if (!srb->msg_count) {
 		dprintkdbg(DBG_0, "msgout_phase1: (pid#%li) NOP msg\n",
-			srb->cmd->pid);
+			srb->cmd->serial_number);
 		DC395x_write8(acb, TRM_S1040_SCSI_FIFO, MSG_NOP);
 		DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);	/* it's important for atn stop */
 		DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_OUT);
@@ -1887,7 +1887,7 @@
 static void command_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
 		u16 *pscsi_status)
 {
-	dprintkdbg(DBG_0, "command_phase0: (pid#%li)\n", srb->cmd->pid);
+	dprintkdbg(DBG_0, "command_phase0: (pid#%li)\n", srb->cmd->serial_number);
 	DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);
 }
 
@@ -1898,7 +1898,7 @@
 	struct DeviceCtlBlk *dcb;
 	u8 *ptr;
 	u16 i;
-	dprintkdbg(DBG_0, "command_phase1: (pid#%li)\n", srb->cmd->pid);
+	dprintkdbg(DBG_0, "command_phase1: (pid#%li)\n", srb->cmd->serial_number);
 
 	clear_fifo(acb, "command_phase1");
 	DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_CLRATN);
@@ -2042,7 +2042,7 @@
 	u16 scsi_status = *pscsi_status;
 	u32 d_left_counter = 0;
 	dprintkdbg(DBG_0, "data_out_phase0: (pid#%li) <%02i-%i>\n",
-		srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
+		srb->cmd->serial_number, srb->cmd->device->id, srb->cmd->device->lun);
 
 	/*
 	 * KG: We need to drain the buffers before we draw any conclusions!
@@ -2172,7 +2172,7 @@
 		u16 *pscsi_status)
 {
 	dprintkdbg(DBG_0, "data_out_phase1: (pid#%li) <%02i-%i>\n",
-		srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
+		srb->cmd->serial_number, srb->cmd->device->id, srb->cmd->device->lun);
 	clear_fifo(acb, "data_out_phase1");
 	/* do prepare before transfer when data out phase */
 	data_io_transfer(acb, srb, XFERDATAOUT);
@@ -2184,7 +2184,7 @@
 	u16 scsi_status = *pscsi_status;
 
 	dprintkdbg(DBG_0, "data_in_phase0: (pid#%li) <%02i-%i>\n",
-		srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
+		srb->cmd->serial_number, srb->cmd->device->id, srb->cmd->device->lun);
 
 	/*
 	 * KG: DataIn is much more tricky than DataOut. When the device is finished
@@ -2205,7 +2205,7 @@
 
 		if (scsi_status & PARITYERROR) {
 			dprintkl(KERN_INFO, "data_in_phase0: (pid#%li) "
-				"Parity Error\n", srb->cmd->pid);
+				"Parity Error\n", srb->cmd->serial_number);
 			srb->status |= PARITY_ERROR;
 		}
 		/*
@@ -2395,7 +2395,7 @@
 		u16 *pscsi_status)
 {
 	dprintkdbg(DBG_0, "data_in_phase1: (pid#%li) <%02i-%i>\n",
-		srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
+		srb->cmd->serial_number, srb->cmd->device->id, srb->cmd->device->lun);
 	data_io_transfer(acb, srb, XFERDATAIN);
 }
 
@@ -2407,7 +2407,7 @@
 	u8 bval;
 	dprintkdbg(DBG_0,
 		"data_io_transfer: (pid#%li) <%02i-%i> %c len=%i, sg=(%i/%i)\n",
-		srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun,
+		srb->cmd->serial_number, srb->cmd->device->id, srb->cmd->device->lun,
 		((io_dir & DMACMD_DIR) ? 'r' : 'w'),
 		srb->total_xfer_length, srb->sg_index, srb->sg_count);
 	if (srb == acb->tmp_srb)
@@ -2580,7 +2580,7 @@
 		u16 *pscsi_status)
 {
 	dprintkdbg(DBG_0, "status_phase0: (pid#%li) <%02i-%i>\n",
-		srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
+		srb->cmd->serial_number, srb->cmd->device->id, srb->cmd->device->lun);
 	srb->target_status = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
 	srb->end_message = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);	/* get message */
 	srb->state = SRB_COMPLETED;
@@ -2594,7 +2594,7 @@
 		u16 *pscsi_status)
 {
 	dprintkdbg(DBG_0, "status_phase1: (pid#%li) <%02i-%i>\n",
-		srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun);
+		srb->cmd->serial_number, srb->cmd->device->id, srb->cmd->device->lun);
 	srb->state = SRB_STATUS;
 	DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);	/* it's important for atn stop */
 	DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_COMP);
@@ -2636,7 +2636,7 @@
 	struct ScsiReqBlk *srb = NULL;
 	struct ScsiReqBlk *i;
 	dprintkdbg(DBG_0, "msgin_qtag: (pid#%li) tag=%i srb=%p\n",
-		   srb->cmd->pid, tag, srb);
+		   srb->cmd->serial_number, tag, srb);
 
 	if (!(dcb->tag_mask & (1 << tag)))
 		dprintkl(KERN_DEBUG,
@@ -2655,7 +2655,7 @@
 		goto mingx0;
 
 	dprintkdbg(DBG_0, "msgin_qtag: (pid#%li) <%02i-%i>\n",
-		srb->cmd->pid, srb->dcb->target_id, srb->dcb->target_lun);
+		srb->cmd->serial_number, srb->dcb->target_id, srb->dcb->target_lun);
 	if (dcb->flag & ABORT_DEV_) {
 		/*srb->state = SRB_ABORT_SENT; */
 		enable_msgout_abort(acb, srb);
@@ -2865,7 +2865,7 @@
 		u16 *pscsi_status)
 {
 	struct DeviceCtlBlk *dcb = acb->active_dcb;
-	dprintkdbg(DBG_0, "msgin_phase0: (pid#%li)\n", srb->cmd->pid);
+	dprintkdbg(DBG_0, "msgin_phase0: (pid#%li)\n", srb->cmd->serial_number);
 
 	srb->msgin_buf[acb->msg_len++] = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
 	if (msgin_completed(srb->msgin_buf, acb->msg_len)) {
@@ -2933,7 +2933,7 @@
 			 */
 			dprintkdbg(DBG_0, "msgin_phase0: (pid#%li) "
 				"SAVE POINTER rem=%i Ignore\n",
-				srb->cmd->pid, srb->total_xfer_length);
+				srb->cmd->serial_number, srb->total_xfer_length);
 			break;
 
 		case RESTORE_POINTERS:
@@ -2943,7 +2943,7 @@
 		case ABORT:
 			dprintkdbg(DBG_0, "msgin_phase0: (pid#%li) "
 				"<%02i-%i> ABORT msg\n",
-				srb->cmd->pid, dcb->target_id,
+				srb->cmd->serial_number, dcb->target_id,
 				dcb->target_lun);
 			dcb->flag |= ABORT_DEV_;
 			enable_msgout_abort(acb, srb);
@@ -2975,7 +2975,7 @@
 static void msgin_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
 		u16 *pscsi_status)
 {
-	dprintkdbg(DBG_0, "msgin_phase1: (pid#%li)\n", srb->cmd->pid);
+	dprintkdbg(DBG_0, "msgin_phase1: (pid#%li)\n", srb->cmd->serial_number);
 	clear_fifo(acb, "msgin_phase1");
 	DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, 1);
 	if (!(srb->state & SRB_MSGIN)) {
@@ -3041,7 +3041,7 @@
 	}
 	srb = dcb->active_srb;
 	acb->active_dcb = NULL;
-	dprintkdbg(DBG_0, "disconnect: (pid#%li)\n", srb->cmd->pid);
+	dprintkdbg(DBG_0, "disconnect: (pid#%li)\n", srb->cmd->serial_number);
 
 	srb->scsi_phase = PH_BUS_FREE;	/* initial phase */
 	clear_fifo(acb, "disconnect");
@@ -3072,13 +3072,13 @@
 				srb->state = SRB_READY;
 				dprintkl(KERN_DEBUG,
 					"disconnect: (pid#%li) Unexpected\n",
-					srb->cmd->pid);
+					srb->cmd->serial_number);
 				srb->target_status = SCSI_STAT_SEL_TIMEOUT;
 				goto disc1;
 			} else {
 				/* Normal selection timeout */
 				dprintkdbg(DBG_KG, "disconnect: (pid#%li) "
-					"<%02i-%i> SelTO\n", srb->cmd->pid,
+					"<%02i-%i> SelTO\n", srb->cmd->serial_number,
 					dcb->target_id, dcb->target_lun);
 				if (srb->retry_count++ > DC395x_MAX_RETRIES
 				    || acb->scan_devices) {
@@ -3090,7 +3090,7 @@
 				srb_going_to_waiting_move(dcb, srb);
 				dprintkdbg(DBG_KG,
 					"disconnect: (pid#%li) Retry\n",
-					srb->cmd->pid);
+					srb->cmd->serial_number);
 				waiting_set_timer(acb, HZ / 20);
 			}
 		} else if (srb->state & SRB_DISCONNECT) {
@@ -3144,7 +3144,7 @@
 		if (!acb->scan_devices) {
 			dprintkdbg(DBG_KG, "reselect: (pid#%li) <%02i-%i> "
 				"Arb lost but Resel win rsel=%i stat=0x%04x\n",
-				srb->cmd->pid, dcb->target_id,
+				srb->cmd->serial_number, dcb->target_id,
 				dcb->target_lun, rsel_tar_lun_id,
 				DC395x_read16(acb, TRM_S1040_SCSI_STATUS));
 			arblostflag = 1;
@@ -3318,7 +3318,7 @@
 	enum dma_data_direction dir = cmd->sc_data_direction;
 	int ckc_only = 1;
 
-	dprintkdbg(DBG_1, "srb_done: (pid#%li) <%02i-%i>\n", srb->cmd->pid,
+	dprintkdbg(DBG_1, "srb_done: (pid#%li) <%02i-%i>\n", srb->cmd->serial_number,
 		srb->cmd->device->id, srb->cmd->device->lun);
 	dprintkdbg(DBG_SG, "srb_done: srb=%p sg=%i(%i/%i) buf=%p\n",
 		   srb, scsi_sg_count(cmd), srb->sg_index, srb->sg_count,
@@ -3499,7 +3499,7 @@
 		if (srb->total_xfer_length)
 			dprintkdbg(DBG_KG, "srb_done: (pid#%li) <%02i-%i> "
 				"cmnd=0x%02x Missed %i bytes\n",
-				cmd->pid, cmd->device->id, cmd->device->lun,
+				cmd->serial_number, cmd->device->id, cmd->device->lun,
 				cmd->cmnd[0], srb->total_xfer_length);
 	}
 
@@ -3509,7 +3509,7 @@
 		dprintkl(KERN_ERR, "srb_done: ERROR! Completed cmd with tmp_srb\n");
 	else {
 		dprintkdbg(DBG_0, "srb_done: (pid#%li) done result=0x%08x\n",
-			cmd->pid, cmd->result);
+			cmd->serial_number, cmd->result);
 		srb_free_insert(acb, srb);
 	}
 	pci_unmap_srb(acb, srb);
@@ -3538,7 +3538,7 @@
 			p = srb->cmd;
 			dir = p->sc_data_direction;
 			result = MK_RES(0, did_flag, 0, 0);
-			printk("G:%li(%02i-%i) ", p->pid,
+			printk("G:%li(%02i-%i) ", p->serial_number,
 			       p->device->id, p->device->lun);
 			srb_going_remove(dcb, srb);
 			free_tag(dcb, srb);
@@ -3568,7 +3568,7 @@
 			p = srb->cmd;
 
 			result = MK_RES(0, did_flag, 0, 0);
-			printk("W:%li<%02i-%i>", p->pid, p->device->id,
+			printk("W:%li<%02i-%i>", p->serial_number, p->device->id,
 			       p->device->lun);
 			srb_waiting_remove(dcb, srb);
 			srb_free_insert(acb, srb);
@@ -3678,7 +3678,7 @@
 {
 	struct scsi_cmnd *cmd = srb->cmd;
 	dprintkdbg(DBG_1, "request_sense: (pid#%li) <%02i-%i>\n",
-		cmd->pid, cmd->device->id, cmd->device->lun);
+		cmd->serial_number, cmd->device->id, cmd->device->lun);
 
 	srb->flag |= AUTO_REQSENSE;
 	srb->adapter_status = 0;
@@ -3709,7 +3709,7 @@
 	if (start_scsi(acb, dcb, srb)) {	/* Should only happen, if sb. else grabs the bus */
 		dprintkl(KERN_DEBUG,
 			"request_sense: (pid#%li) failed <%02i-%i>\n",
-			srb->cmd->pid, dcb->target_id, dcb->target_lun);
+			srb->cmd->serial_number, dcb->target_id, dcb->target_lun);
 		srb_going_to_waiting_move(dcb, srb);
 		waiting_set_timer(acb, HZ / 100);
 	}
@@ -4717,13 +4717,13 @@
 				dcb->target_id, dcb->target_lun,
 				list_size(&dcb->srb_waiting_list));
                 list_for_each_entry(srb, &dcb->srb_waiting_list, list)
-			SPRINTF(" %li", srb->cmd->pid);
+			SPRINTF(" %li", srb->cmd->serial_number);
 		if (!list_empty(&dcb->srb_going_list))
 			SPRINTF("\nDCB (%02i-%i): Going  : %i:",
 				dcb->target_id, dcb->target_lun,
 				list_size(&dcb->srb_going_list));
 		list_for_each_entry(srb, &dcb->srb_going_list, list)
-			SPRINTF(" %li", srb->cmd->pid);
+			SPRINTF(" %li", srb->cmd->serial_number);
 		if (!list_empty(&dcb->srb_waiting_list) || !list_empty(&dcb->srb_going_list))
 			SPRINTF("\n");
 	}
diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index a83e9f1..ec22331 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1758,7 +1758,7 @@
 
 	if (SCpnt->host_scribble)
 		panic("%s: qcomm, pid %ld, SCpnt %p already active.\n",
-		      ha->board_name, SCpnt->pid, SCpnt);
+		      ha->board_name, SCpnt->serial_number, SCpnt);
 
 	/* i is the mailbox number, look for the first free mailbox
 	   starting from last_cp_used */
@@ -1792,7 +1792,7 @@
 
 	if (do_trace)
 		scmd_printk(KERN_INFO, SCpnt,
-			"qcomm, mbox %d, pid %ld.\n", i, SCpnt->pid);
+			"qcomm, mbox %d, pid %ld.\n", i, SCpnt->serial_number);
 
 	cpp->reqsen = 1;
 	cpp->dispri = 1;
@@ -1825,7 +1825,7 @@
 		unmap_dma(i, ha);
 		SCpnt->host_scribble = NULL;
 		scmd_printk(KERN_INFO, SCpnt,
-			"qcomm, pid %ld, adapter busy.\n", SCpnt->pid);
+			"qcomm, pid %ld, adapter busy.\n", SCpnt->serial_number);
 		return 1;
 	}
 
@@ -1841,13 +1841,13 @@
 
 	if (SCarg->host_scribble == NULL) {
 		scmd_printk(KERN_INFO, SCarg,
-			"abort, pid %ld inactive.\n", SCarg->pid);
+			"abort, pid %ld inactive.\n", SCarg->serial_number);
 		return SUCCESS;
 	}
 
 	i = *(unsigned int *)SCarg->host_scribble;
 	scmd_printk(KERN_WARNING, SCarg,
-		"abort, mbox %d, pid %ld.\n", i, SCarg->pid);
+		"abort, mbox %d, pid %ld.\n", i, SCarg->serial_number);
 
 	if (i >= shost->can_queue)
 		panic("%s: abort, invalid SCarg->host_scribble.\n", ha->board_name);
@@ -1892,7 +1892,7 @@
 		SCarg->host_scribble = NULL;
 		ha->cp_stat[i] = FREE;
 		printk("%s, abort, mbox %d ready, DID_ABORT, pid %ld done.\n",
-		       ha->board_name, i, SCarg->pid);
+		       ha->board_name, i, SCarg->serial_number);
 		SCarg->scsi_done(SCarg);
 		return SUCCESS;
 	}
@@ -1909,12 +1909,12 @@
 	struct hostdata *ha = (struct hostdata *)shost->hostdata;
 
 	scmd_printk(KERN_INFO, SCarg,
-		"reset, enter, pid %ld.\n", SCarg->pid);
+		"reset, enter, pid %ld.\n", SCarg->serial_number);
 
 	spin_lock_irq(shost->host_lock);
 
 	if (SCarg->host_scribble == NULL)
-		printk("%s: reset, pid %ld inactive.\n", ha->board_name, SCarg->pid);
+		printk("%s: reset, pid %ld inactive.\n", ha->board_name, SCarg->serial_number);
 
 	if (ha->in_reset) {
 		printk("%s: reset, exit, already in reset.\n", ha->board_name);
@@ -1954,13 +1954,13 @@
 		if (ha->cp_stat[i] == READY || ha->cp_stat[i] == ABORTING) {
 			ha->cp_stat[i] = ABORTING;
 			printk("%s: reset, mbox %d aborting, pid %ld.\n",
-			       ha->board_name, i, SCpnt->pid);
+			       ha->board_name, i, SCpnt->serial_number);
 		}
 
 		else {
 			ha->cp_stat[i] = IN_RESET;
 			printk("%s: reset, mbox %d in reset, pid %ld.\n",
-			       ha->board_name, i, SCpnt->pid);
+			       ha->board_name, i, SCpnt->serial_number);
 		}
 
 		if (SCpnt->host_scribble == NULL)
@@ -2015,7 +2015,7 @@
 
 			printk
 			    ("%s, reset, mbox %d locked, DID_RESET, pid %ld done.\n",
-			     ha->board_name, i, SCpnt->pid);
+			     ha->board_name, i, SCpnt->serial_number);
 		}
 
 		else if (ha->cp_stat[i] == ABORTING) {
@@ -2029,7 +2029,7 @@
 
 			printk
 			    ("%s, reset, mbox %d aborting, DID_RESET, pid %ld done.\n",
-			     ha->board_name, i, SCpnt->pid);
+			     ha->board_name, i, SCpnt->serial_number);
 		}
 
 		else
@@ -2043,7 +2043,7 @@
 	do_trace = 0;
 
 	if (arg_done)
-		printk("%s: reset, exit, pid %ld done.\n", ha->board_name, SCarg->pid);
+		printk("%s: reset, exit, pid %ld done.\n", ha->board_name, SCarg->serial_number);
 	else
 		printk("%s: reset, exit.\n", ha->board_name);
 
@@ -2182,7 +2182,7 @@
 			cpp = &ha->cp[k];
 			SCpnt = cpp->SCpnt;
 			ll[n] = SCpnt->request->nr_sectors;
-			pl[n] = SCpnt->pid;
+			pl[n] = SCpnt->serial_number;
 
 			if (!n)
 				continue;
@@ -2230,7 +2230,7 @@
 			    "%s pid %ld mb %d fc %d nr %d sec %ld ns %ld"
 			     " cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
 			     (ihdlr ? "ihdlr" : "qcomm"),
-			     SCpnt->pid, k, flushcount,
+			     SCpnt->serial_number, k, flushcount,
 			     n_ready, SCpnt->request->sector,
 			     SCpnt->request->nr_sectors, cursec, YESNO(s),
 			     YESNO(r), YESNO(rev), YESNO(input_only),
@@ -2277,7 +2277,7 @@
 			    "%s, pid %ld, mbox %d, adapter"
 			     " busy, will abort.\n",
 			     (ihdlr ? "ihdlr" : "qcomm"),
-			     SCpnt->pid, k);
+			     SCpnt->serial_number, k);
 			ha->cp_stat[k] = ABORTING;
 			continue;
 		}
@@ -2391,11 +2391,11 @@
 
 	if (SCpnt->host_scribble == NULL)
 		panic("%s: ihdlr, mbox %d, pid %ld, SCpnt %p garbled.\n", ha->board_name,
-		      i, SCpnt->pid, SCpnt);
+		      i, SCpnt->serial_number, SCpnt);
 
 	if (*(unsigned int *)SCpnt->host_scribble != i)
 		panic("%s: ihdlr, mbox %d, pid %ld, index mismatch %d.\n",
-		      ha->board_name, i, SCpnt->pid,
+		      ha->board_name, i, SCpnt->serial_number,
 		      *(unsigned int *)SCpnt->host_scribble);
 
 	sync_dma(i, ha);
@@ -2445,12 +2445,12 @@
 			       "target_status 0x%x, sense key 0x%x.\n",
 			       ha->board_name,
 			       SCpnt->device->channel, SCpnt->device->id,
-			       SCpnt->device->lun, SCpnt->pid,
+			       SCpnt->device->lun, SCpnt->serial_number,
 			       spp->target_status, SCpnt->sense_buffer[2]);
 
 		ha->target_to[SCpnt->device->id][SCpnt->device->channel] = 0;
 
-		if (ha->last_retried_pid == SCpnt->pid)
+		if (ha->last_retried_pid == SCpnt->serial_number)
 			ha->retries = 0;
 
 		break;
@@ -2485,7 +2485,7 @@
 #endif
 
 			ha->retries++;
-			ha->last_retried_pid = SCpnt->pid;
+			ha->last_retried_pid = SCpnt->serial_number;
 		} else
 			status = DID_ERROR << 16;
 
@@ -2516,7 +2516,7 @@
 		scmd_printk(KERN_INFO, SCpnt, "ihdlr, mbox %2d, err 0x%x:%x,"
 		       " pid %ld, reg 0x%x, count %d.\n",
 		       i, spp->adapter_status, spp->target_status,
-		       SCpnt->pid, reg, ha->iocount);
+		       SCpnt->serial_number, reg, ha->iocount);
 
 	unmap_dma(i, ha);
 
diff --git a/drivers/scsi/eata_pio.c b/drivers/scsi/eata_pio.c
index 73260e5..96180bb 100644
--- a/drivers/scsi/eata_pio.c
+++ b/drivers/scsi/eata_pio.c
@@ -375,7 +375,7 @@
 
 	DBG(DBG_QUEUE, scmd_printk(KERN_DEBUG, cmd,
 		"eata_pio_queue pid %ld, y %d\n",
-		cmd->pid, y));
+		cmd->serial_number, y));
 
 	cmd->scsi_done = (void *) done;
 
@@ -420,7 +420,7 @@
 		cmd->result = DID_BUS_BUSY << 16;
 		scmd_printk(KERN_NOTICE, cmd,
 			"eata_pio_queue pid %ld, HBA busy, "
-			"returning DID_BUS_BUSY, done.\n", cmd->pid);
+			"returning DID_BUS_BUSY, done.\n", cmd->serial_number);
 		done(cmd);
 		cp->status = FREE;
 		return 0;
@@ -435,7 +435,7 @@
 
 	DBG(DBG_QUEUE, scmd_printk(KERN_DEBUG, cmd,
 		"Queued base %#.4lx pid: %ld "
-		"slot %d irq %d\n", sh->base, cmd->pid, y, sh->irq));
+		"slot %d irq %d\n", sh->base, cmd->serial_number, y, sh->irq));
 
 	return 0;
 }
@@ -446,7 +446,7 @@
 
 	DBG(DBG_ABNORM, scmd_printk(KERN_WARNING, cmd,
 		"eata_pio_abort called pid: %ld\n",
-		cmd->pid));
+		cmd->serial_number));
 
 	while (inb(cmd->device->host->base + HA_RAUXSTAT) & HA_ABUSY)
 		if (--loop == 0) {
@@ -482,7 +482,7 @@
 
 	DBG(DBG_ABNORM, scmd_printk(KERN_WARNING, cmd,
 		"eata_pio_reset called pid:%ld\n",
-		cmd->pid));
+		cmd->serial_number));
 
 	spin_lock_irq(host->host_lock);
 
@@ -501,7 +501,7 @@
 
 		sp = HD(cmd)->ccb[x].cmd;
 		HD(cmd)->ccb[x].status = RESET;
-		printk(KERN_WARNING "eata_pio_reset: slot %d in reset, pid %ld.\n", x, sp->pid);
+		printk(KERN_WARNING "eata_pio_reset: slot %d in reset, pid %ld.\n", x, sp->serial_number);
 
 		if (sp == NULL)
 			panic("eata_pio_reset: slot %d, sp==NULL.\n", x);
diff --git a/drivers/scsi/in2000.c b/drivers/scsi/in2000.c
index 312190a..ab7cbf3 100644
--- a/drivers/scsi/in2000.c
+++ b/drivers/scsi/in2000.c
@@ -343,7 +343,7 @@
 	instance = cmd->device->host;
 	hostdata = (struct IN2000_hostdata *) instance->hostdata;
 
-	DB(DB_QUEUE_COMMAND, scmd_printk(KERN_DEBUG, cmd, "Q-%02x-%ld(", cmd->cmnd[0], cmd->pid))
+	DB(DB_QUEUE_COMMAND, scmd_printk(KERN_DEBUG, cmd, "Q-%02x-%ld(", cmd->cmnd[0], cmd->serial_number))
 
 /* Set up a few fields in the Scsi_Cmnd structure for our own use:
  *  - host_scribble is the pointer to the next cmd in the input queue
@@ -427,7 +427,7 @@
 
 	in2000_execute(cmd->device->host);
 
-	DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->pid))
+	DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->serial_number))
 	    return 0;
 }
 
@@ -703,7 +703,7 @@
 	 * to search the input_Q again...
 	 */
 
-	DB(DB_EXECUTE, printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->pid))
+	DB(DB_EXECUTE, printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->serial_number))
 
 }
 
@@ -1147,7 +1147,7 @@
 	case CSR_XFER_DONE | PHS_COMMAND:
 	case CSR_UNEXP | PHS_COMMAND:
 	case CSR_SRV_REQ | PHS_COMMAND:
-		DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->pid))
+		DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->serial_number))
 		    transfer_pio(cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, hostdata);
 		hostdata->state = S_CONNECTED;
 		break;
@@ -1189,7 +1189,7 @@
 		switch (msg) {
 
 		case COMMAND_COMPLETE:
-			DB(DB_INTR, printk("CCMP-%ld", cmd->pid))
+			DB(DB_INTR, printk("CCMP-%ld", cmd->serial_number))
 			    write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
 			hostdata->state = S_PRE_CMP_DISC;
 			break;
@@ -1327,7 +1327,7 @@
 
 		write_3393(hostdata, WD_SOURCE_ID, SRCID_ER);
 		if (phs == 0x60) {
-			DB(DB_INTR, printk("SX-DONE-%ld", cmd->pid))
+			DB(DB_INTR, printk("SX-DONE-%ld", cmd->serial_number))
 			    cmd->SCp.Message = COMMAND_COMPLETE;
 			lun = read_3393(hostdata, WD_TARGET_LUN);
 			DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
@@ -1348,7 +1348,7 @@
 
 			in2000_execute(instance);
 		} else {
-			printk("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---", asr, sr, phs, cmd->pid);
+			printk("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---", asr, sr, phs, cmd->serial_number);
 		}
 		break;
 
@@ -1415,7 +1415,7 @@
 			spin_unlock_irqrestore(instance->host_lock, flags);
 			return IRQ_HANDLED;
 		}
-		DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->pid))
+		DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->serial_number))
 		    hostdata->connected = NULL;
 		hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
 		hostdata->state = S_UNCONNECTED;
@@ -1440,7 +1440,7 @@
  */
 
 		write_3393(hostdata, WD_SOURCE_ID, SRCID_ER);
-		DB(DB_INTR, printk("DISC-%ld", cmd->pid))
+		DB(DB_INTR, printk("DISC-%ld", cmd->serial_number))
 		    if (cmd == NULL) {
 			printk(" - Already disconnected! ");
 			hostdata->state = S_UNCONNECTED;
@@ -1573,7 +1573,7 @@
 		} else
 			hostdata->state = S_CONNECTED;
 
-		DB(DB_INTR, printk("-%ld", cmd->pid))
+		DB(DB_INTR, printk("-%ld", cmd->serial_number))
 		    break;
 
 	default:
@@ -1702,7 +1702,7 @@
 				prev->host_scribble = cmd->host_scribble;
 			cmd->host_scribble = NULL;
 			cmd->result = DID_ABORT << 16;
-			printk(KERN_WARNING "scsi%d: Abort - removing command %ld from input_Q. ", instance->host_no, cmd->pid);
+			printk(KERN_WARNING "scsi%d: Abort - removing command %ld from input_Q. ", instance->host_no, cmd->serial_number);
 			cmd->scsi_done(cmd);
 			return SUCCESS;
 		}
@@ -1723,7 +1723,7 @@
 
 	if (hostdata->connected == cmd) {
 
-		printk(KERN_WARNING "scsi%d: Aborting connected command %ld - ", instance->host_no, cmd->pid);
+		printk(KERN_WARNING "scsi%d: Aborting connected command %ld - ", instance->host_no, cmd->serial_number);
 
 		printk("sending wd33c93 ABORT command - ");
 		write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
@@ -2268,7 +2268,7 @@
 		strcat(bp, "\nconnected:     ");
 		if (hd->connected) {
 			cmd = (Scsi_Cmnd *) hd->connected;
-			sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+			sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
 			strcat(bp, tbuf);
 		}
 	}
@@ -2276,7 +2276,7 @@
 		strcat(bp, "\ninput_Q:       ");
 		cmd = (Scsi_Cmnd *) hd->input_Q;
 		while (cmd) {
-			sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+			sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
 			strcat(bp, tbuf);
 			cmd = (Scsi_Cmnd *) cmd->host_scribble;
 		}
@@ -2285,7 +2285,7 @@
 		strcat(bp, "\ndisconnected_Q:");
 		cmd = (Scsi_Cmnd *) hd->disconnected_Q;
 		while (cmd) {
-			sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+			sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
 			strcat(bp, tbuf);
 			cmd = (Scsi_Cmnd *) cmd->host_scribble;
 		}
diff --git a/drivers/scsi/ncr53c8xx.c b/drivers/scsi/ncr53c8xx.c
index 91fa66c..016c462 100644
--- a/drivers/scsi/ncr53c8xx.c
+++ b/drivers/scsi/ncr53c8xx.c
@@ -8143,12 +8143,7 @@
 	unsigned long flags;
 	struct scsi_cmnd *done_list;
 
-#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
-	printk("ncr53c8xx_abort: pid=%lu serial_number=%ld\n",
-		cmd->pid, cmd->serial_number);
-#else
-	printk("ncr53c8xx_abort: command pid %lu\n", cmd->pid);
-#endif
+	printk("ncr53c8xx_abort: command pid %lu\n", cmd->serial_number);
 
 	NCR_LOCK_NCB(np, flags);
 
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 54d8bdf..fba8aa8 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -4086,7 +4086,7 @@
 	   } */
 	printk("  tag=%d, transfersize=0x%x \n",
 	       cmd->tag, cmd->transfersize);
-	printk("  Pid=%li, SP=0x%p\n", cmd->pid, CMD_SP(cmd));
+	printk("  Pid=%li, SP=0x%p\n", cmd->serial_number, CMD_SP(cmd));
 	printk(" underflow size = 0x%x, direction=0x%x\n",
 	       cmd->underflow, cmd->sc_data_direction);
 }
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index a5de1a8..07a7c2a 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -442,7 +442,7 @@
 #endif
 
 /* 
- * Assign a serial number and pid to the request for error recovery
+ * Assign a serial number to the request for error recovery
  * and debugging purposes.  Protected by the Host_Lock of host.
  */
 static inline void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd)
@@ -450,10 +450,6 @@
 	cmd->serial_number = host->cmd_serial_number++;
 	if (cmd->serial_number == 0) 
 		cmd->serial_number = host->cmd_serial_number++;
-	
-	cmd->pid = host->cmd_pid++;
-	if (cmd->pid == 0)
-		cmd->pid = host->cmd_pid++;
 }
 
 /*
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index c05d020..44e6721 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1681,12 +1681,6 @@
 
 	init_timer(&scmd->eh_timeout);
 
-	/*
-	 * Sometimes the command can get back into the timer chain,
-	 * so use the pid as an identifier.
-	 */
-	scmd->pid			= 0;
-
 	spin_lock_irqsave(shost->host_lock, flags);
 	shost->tmf_in_progress = 1;
 	spin_unlock_irqrestore(shost->host_lock, flags);
diff --git a/drivers/scsi/tmscsim.c b/drivers/scsi/tmscsim.c
index 5db1520..5c72ca3 100644
--- a/drivers/scsi/tmscsim.c
+++ b/drivers/scsi/tmscsim.c
@@ -567,12 +567,12 @@
 	pDCB->TagMask |= 1 << tag[1];
 	pSRB->TagNumber = tag[1];
 	DC390_write8(ScsiFifo, tag[1]);
-	DEBUG1(printk(KERN_INFO "DC390: Select w/DisCn for Cmd %li (SRB %p), block tag %02x\n", scmd->pid, pSRB, tag[1]));
+	DEBUG1(printk(KERN_INFO "DC390: Select w/DisCn for Cmd %li (SRB %p), block tag %02x\n", scmd->serial_number, pSRB, tag[1]));
 	cmd = SEL_W_ATN3;
     } else {
 	/* No TagQ */
 //no_tag:
-	DEBUG1(printk(KERN_INFO "DC390: Select w%s/DisCn for Cmd %li (SRB %p), No TagQ\n", disc_allowed ? "" : "o", scmd->pid, pSRB));
+	DEBUG1(printk(KERN_INFO "DC390: Select w%s/DisCn for Cmd %li (SRB %p), No TagQ\n", disc_allowed ? "" : "o", scmd->serial_number, pSRB));
     }
 
     pSRB->SRBState = SRB_START_;
@@ -623,7 +623,7 @@
     {
 	dc390_freetag (pDCB, pSRB);
 	DEBUG0(printk ("DC390: Interrupt during Start SCSI (pid %li, target %02i-%02i)\n",
-		scmd->pid, scmd->device->id, scmd->device->lun));
+		scmd->serial_number, scmd->device->id, scmd->device->lun));
 	pSRB->SRBState = SRB_READY;
 	//DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
 	pACB->SelLost++;
@@ -1708,7 +1708,7 @@
     status = pSRB->TargetStatus;
 
     DEBUG0(printk (" SRBdone (%02x,%08x), SRB %p, pid %li\n", status, pcmd->result,\
-		pSRB, pcmd->pid));
+		pSRB, pcmd->serial_number));
     if(pSRB->SRBFlag & AUTO_REQSENSE)
     {	/* Last command was a Request Sense */
 	pSRB->SRBFlag &= ~AUTO_REQSENSE;
@@ -1729,7 +1729,7 @@
 	    } else {
 		SET_RES_DRV(pcmd->result, DRIVER_SENSE);
 		//pSRB->ScsiCmdLen	 = (u8) (pSRB->Segment1[0] >> 8);
-		DEBUG0 (printk ("DC390: RETRY pid %li (%02x), target %02i-%02i\n", pcmd->pid, pcmd->cmnd[0], pcmd->device->id, pcmd->device->lun));
+		DEBUG0 (printk ("DC390: RETRY pid %li (%02x), target %02i-%02i\n", pcmd->serial_number, pcmd->cmnd[0], pcmd->device->id, pcmd->device->lun));
 		pSRB->TotalXferredLen = 0;
 		SET_RES_DID(pcmd->result, DID_SOFT_ERROR);
 	    }
@@ -1749,7 +1749,7 @@
 	else if (status == SAM_STAT_TASK_SET_FULL)
 	{
 	    scsi_track_queue_full(pcmd->device, pDCB->GoingSRBCnt - 1);
-	    DEBUG0 (printk ("DC390: RETRY pid %li (%02x), target %02i-%02i\n", pcmd->pid, pcmd->cmnd[0], pcmd->device->id, pcmd->device->lun));
+	    DEBUG0 (printk ("DC390: RETRY pid %li (%02x), target %02i-%02i\n", pcmd->serial_number, pcmd->cmnd[0], pcmd->device->id, pcmd->device->lun));
 	    pSRB->TotalXferredLen = 0;
 	    SET_RES_DID(pcmd->result, DID_SOFT_ERROR);
 	}
@@ -1803,7 +1803,7 @@
     /* Add to free list */
     dc390_Free_insert (pACB, pSRB);
 
-    DEBUG0(printk (KERN_DEBUG "DC390: SRBdone: done pid %li\n", pcmd->pid));
+    DEBUG0(printk (KERN_DEBUG "DC390: SRBdone: done pid %li\n", pcmd->serial_number));
     pcmd->scsi_done (pcmd);
 
     return;
@@ -1998,7 +1998,7 @@
 	struct dc390_dcb *pDCB = (struct dc390_dcb*) cmd->device->hostdata;
 
 	scmd_printk(KERN_WARNING, cmd,
-		"DC390: Abort command (pid %li)\n", cmd->pid);
+		"DC390: Abort command (pid %li)\n", cmd->serial_number);
 
 	/* abort() is too stupid for already sent commands at the moment. 
 	 * If it's called we are in trouble anyway, so let's dump some info 
@@ -2006,7 +2006,7 @@
 	dc390_dumpinfo(pACB, pDCB, NULL);
 
 	pDCB->DCBFlag |= ABORT_DEV_;
-	printk(KERN_INFO "DC390: Aborted pid %li\n", cmd->pid);
+	printk(KERN_INFO "DC390: Aborted pid %li\n", cmd->serial_number);
 
 	return FAILED;
 }
diff --git a/drivers/scsi/u14-34f.c b/drivers/scsi/u14-34f.c
index 9e8232a..fc9f518 100644
--- a/drivers/scsi/u14-34f.c
+++ b/drivers/scsi/u14-34f.c
@@ -1254,7 +1254,7 @@
 
    if (SCpnt->host_scribble)
       panic("%s: qcomm, pid %ld, SCpnt %p already active.\n",
-            BN(j), SCpnt->pid, SCpnt);
+            BN(j), SCpnt->serial_number, SCpnt);
 
    /* i is the mailbox number, look for the first free mailbox
       starting from last_cp_used */
@@ -1285,7 +1285,7 @@
 
    if (do_trace) printk("%s: qcomm, mbox %d, target %d.%d:%d, pid %ld.\n",
                         BN(j), i, SCpnt->device->channel, SCpnt->device->id,
-                        SCpnt->device->lun, SCpnt->pid);
+                        SCpnt->device->lun, SCpnt->serial_number);
 
    cpp->opcode = OP_SCSI;
    cpp->channel = SCpnt->device->channel;
@@ -1312,7 +1312,7 @@
       unmap_dma(i, j);
       SCpnt->host_scribble = NULL;
       scmd_printk(KERN_INFO, SCpnt,
-      		"qcomm, pid %ld, adapter busy.\n", SCpnt->pid);
+      		"qcomm, pid %ld, adapter busy.\n", SCpnt->serial_number);
       return 1;
       }
 
@@ -1333,13 +1333,13 @@
 
    if (SCarg->host_scribble == NULL) {
       scmd_printk(KERN_INFO, SCarg, "abort, pid %ld inactive.\n",
-             SCarg->pid);
+             SCarg->serial_number);
       return SUCCESS;
       }
 
    i = *(unsigned int *)SCarg->host_scribble;
    scmd_printk(KERN_INFO, SCarg, "abort, mbox %d, pid %ld.\n",
-	       i, SCarg->pid);
+	       i, SCarg->serial_number);
 
    if (i >= sh[j]->can_queue)
       panic("%s: abort, invalid SCarg->host_scribble.\n", BN(j));
@@ -1383,7 +1383,7 @@
       SCarg->host_scribble = NULL;
       HD(j)->cp_stat[i] = FREE;
       printk("%s, abort, mbox %d ready, DID_ABORT, pid %ld done.\n",
-             BN(j), i, SCarg->pid);
+             BN(j), i, SCarg->serial_number);
       SCarg->scsi_done(SCarg);
       return SUCCESS;
       }
@@ -1397,12 +1397,12 @@
    struct scsi_cmnd *SCpnt;
 
    j = ((struct hostdata *) SCarg->device->host->hostdata)->board_number;
-   scmd_printk(KERN_INFO, SCarg, "reset, enter, pid %ld.\n", SCarg->pid);
+   scmd_printk(KERN_INFO, SCarg, "reset, enter, pid %ld.\n", SCarg->serial_number);
 
    spin_lock_irq(sh[j]->host_lock);
 
    if (SCarg->host_scribble == NULL)
-      printk("%s: reset, pid %ld inactive.\n", BN(j), SCarg->pid);
+      printk("%s: reset, pid %ld inactive.\n", BN(j), SCarg->serial_number);
 
    if (HD(j)->in_reset) {
       printk("%s: reset, exit, already in reset.\n", BN(j));
@@ -1440,13 +1440,13 @@
       if (HD(j)->cp_stat[i] == READY || HD(j)->cp_stat[i] == ABORTING) {
          HD(j)->cp_stat[i] = ABORTING;
          printk("%s: reset, mbox %d aborting, pid %ld.\n",
-                BN(j), i, SCpnt->pid);
+                BN(j), i, SCpnt->serial_number);
          }
 
       else {
          HD(j)->cp_stat[i] = IN_RESET;
          printk("%s: reset, mbox %d in reset, pid %ld.\n",
-                BN(j), i, SCpnt->pid);
+                BN(j), i, SCpnt->serial_number);
          }
 
       if (SCpnt->host_scribble == NULL)
@@ -1495,7 +1495,7 @@
          HD(j)->cp_stat[i] = LOCKED;
 
          printk("%s, reset, mbox %d locked, DID_RESET, pid %ld done.\n",
-                BN(j), i, SCpnt->pid);
+                BN(j), i, SCpnt->serial_number);
          }
 
       else if (HD(j)->cp_stat[i] == ABORTING) {
@@ -1508,7 +1508,7 @@
          HD(j)->cp_stat[i] = FREE;
 
          printk("%s, reset, mbox %d aborting, DID_RESET, pid %ld done.\n",
-                BN(j), i, SCpnt->pid);
+                BN(j), i, SCpnt->serial_number);
          }
 
       else
@@ -1522,7 +1522,7 @@
    HD(j)->in_reset = FALSE;
    do_trace = FALSE;
 
-   if (arg_done) printk("%s: reset, exit, pid %ld done.\n", BN(j), SCarg->pid);
+   if (arg_done) printk("%s: reset, exit, pid %ld done.\n", BN(j), SCarg->serial_number);
    else          printk("%s: reset, exit.\n", BN(j));
 
    spin_unlock_irq(sh[j]->host_lock);
@@ -1639,7 +1639,7 @@
 
    if (!input_only) for (n = 0; n < n_ready; n++) {
       k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
-      ll[n] = SCpnt->request->nr_sectors; pl[n] = SCpnt->pid;
+      ll[n] = SCpnt->request->nr_sectors; pl[n] = SCpnt->serial_number;
 
       if (!n) continue;
 
@@ -1666,7 +1666,7 @@
          printk("%s %d.%d:%d pid %ld mb %d fc %d nr %d sec %ld ns %ld"\
                 " cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
                 (ihdlr ? "ihdlr" : "qcomm"), SCpnt->channel, SCpnt->target,
-                SCpnt->lun, SCpnt->pid, k, flushcount, n_ready,
+                SCpnt->lun, SCpnt->serial_number, k, flushcount, n_ready,
                 SCpnt->request->sector, SCpnt->request->nr_sectors, cursec,
                 YESNO(s), YESNO(r), YESNO(rev), YESNO(input_only),
                 YESNO(overlap), cpp->xdir);
@@ -1703,7 +1703,7 @@
          scmd_printk(KERN_INFO, SCpnt,
 	 	"%s, pid %ld, mbox %d, adapter"
                 " busy, will abort.\n", (ihdlr ? "ihdlr" : "qcomm"),
-                SCpnt->pid, k);
+                SCpnt->serial_number, k);
          HD(j)->cp_stat[k] = ABORTING;
          continue;
          }
@@ -1787,11 +1787,11 @@
 
    if (SCpnt->host_scribble == NULL)
       panic("%s: ihdlr, mbox %d, pid %ld, SCpnt %p garbled.\n", BN(j), i,
-            SCpnt->pid, SCpnt);
+            SCpnt->serial_number, SCpnt);
 
    if (*(unsigned int *)SCpnt->host_scribble != i)
       panic("%s: ihdlr, mbox %d, pid %ld, index mismatch %d.\n",
-            BN(j), i, SCpnt->pid, *(unsigned int *)SCpnt->host_scribble);
+            BN(j), i, SCpnt->serial_number, *(unsigned int *)SCpnt->host_scribble);
 
    sync_dma(i, j);
 
@@ -1835,12 +1835,12 @@
                (SCpnt->sense_buffer[2] & 0xf) == NOT_READY)))
             scmd_printk(KERN_INFO, SCpnt,
 	    	"ihdlr, pid %ld, target_status 0x%x, sense key 0x%x.\n",
-                   SCpnt->pid, spp->target_status,
+                   SCpnt->serial_number, spp->target_status,
                    SCpnt->sense_buffer[2]);
 
          HD(j)->target_to[scmd_id(SCpnt)][scmd_channel(SCpnt)] = 0;
 
-         if (HD(j)->last_retried_pid == SCpnt->pid) HD(j)->retries = 0;
+         if (HD(j)->last_retried_pid == SCpnt->serial_number) HD(j)->retries = 0;
 
          break;
       case ASST:     /* Selection Time Out */
@@ -1877,7 +1877,7 @@
 #endif
 
             HD(j)->retries++;
-            HD(j)->last_retried_pid = SCpnt->pid;
+            HD(j)->last_retried_pid = SCpnt->serial_number;
             }
          else
             status = DID_ERROR << 16;
@@ -1907,7 +1907,7 @@
 #endif
       scmd_printk(KERN_INFO, SCpnt, "ihdlr, mbox %2d, err 0x%x:%x,"\
              " pid %ld, reg 0x%x, count %d.\n",
-             i, spp->adapter_status, spp->target_status, SCpnt->pid,
+             i, spp->adapter_status, spp->target_status, SCpnt->serial_number,
              reg, HD(j)->iocount);
 
    unmap_dma(i, j);
diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
index b92ff04..0e8e642 100644
--- a/drivers/scsi/wd33c93.c
+++ b/drivers/scsi/wd33c93.c
@@ -381,7 +381,7 @@
 	hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
 
 	DB(DB_QUEUE_COMMAND,
-	   printk("Q-%d-%02x-%ld( ", cmd->device->id, cmd->cmnd[0], cmd->pid))
+	   printk("Q-%d-%02x-%ld( ", cmd->device->id, cmd->cmnd[0], cmd->serial_number))
 
 /* Set up a few fields in the scsi_cmnd structure for our own use:
  *  - host_scribble is the pointer to the next cmd in the input queue
@@ -463,7 +463,7 @@
 
 	wd33c93_execute(cmd->device->host);
 
-	DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->pid))
+	DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->serial_number))
 
 	spin_unlock_irq(&hostdata->lock);
 	return 0;
@@ -686,7 +686,7 @@
 	 */
 
 	DB(DB_EXECUTE,
-	   printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->pid))
+	   printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->serial_number))
 }
 
 static void
@@ -963,7 +963,7 @@
 	case CSR_XFER_DONE | PHS_COMMAND:
 	case CSR_UNEXP | PHS_COMMAND:
 	case CSR_SRV_REQ | PHS_COMMAND:
-		DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->pid))
+		DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->serial_number))
 		    transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
 				 hostdata);
 		hostdata->state = S_CONNECTED;
@@ -1007,7 +1007,7 @@
 		switch (msg) {
 
 		case COMMAND_COMPLETE:
-			DB(DB_INTR, printk("CCMP-%ld", cmd->pid))
+			DB(DB_INTR, printk("CCMP-%ld", cmd->serial_number))
 			    write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
 			hostdata->state = S_PRE_CMP_DISC;
 			break;
@@ -1174,7 +1174,7 @@
 
 		write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
 		if (phs == 0x60) {
-			DB(DB_INTR, printk("SX-DONE-%ld", cmd->pid))
+			DB(DB_INTR, printk("SX-DONE-%ld", cmd->serial_number))
 			    cmd->SCp.Message = COMMAND_COMPLETE;
 			lun = read_wd33c93(regs, WD_TARGET_LUN);
 			DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
@@ -1201,7 +1201,7 @@
 		} else {
 			printk
 			    ("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",
-			     asr, sr, phs, cmd->pid);
+			     asr, sr, phs, cmd->serial_number);
 			spin_unlock_irqrestore(&hostdata->lock, flags);
 		}
 		break;
@@ -1266,7 +1266,7 @@
 			spin_unlock_irqrestore(&hostdata->lock, flags);
 			return;
 		}
-		DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->pid))
+		DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->serial_number))
 		    hostdata->connected = NULL;
 		hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
 		hostdata->state = S_UNCONNECTED;
@@ -1292,7 +1292,7 @@
  */
 
 		write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
-		DB(DB_INTR, printk("DISC-%ld", cmd->pid))
+		DB(DB_INTR, printk("DISC-%ld", cmd->serial_number))
 		    if (cmd == NULL) {
 			printk(" - Already disconnected! ");
 			hostdata->state = S_UNCONNECTED;
@@ -1491,7 +1491,7 @@
 		} else
 			hostdata->state = S_CONNECTED;
 
-		DB(DB_INTR, printk("-%ld", cmd->pid))
+		DB(DB_INTR, printk("-%ld", cmd->serial_number))
 		    spin_unlock_irqrestore(&hostdata->lock, flags);
 		break;
 
@@ -1638,7 +1638,7 @@
 			cmd->result = DID_ABORT << 16;
 			printk
 			    ("scsi%d: Abort - removing command %ld from input_Q. ",
-			     instance->host_no, cmd->pid);
+			     instance->host_no, cmd->serial_number);
 			enable_irq(cmd->device->host->irq);
 			cmd->scsi_done(cmd);
 			return SUCCESS;
@@ -1663,7 +1663,7 @@
 		unsigned long timeout;
 
 		printk("scsi%d: Aborting connected command %ld - ",
-		       instance->host_no, cmd->pid);
+		       instance->host_no, cmd->serial_number);
 
 		printk("stopping DMA - ");
 		if (hostdata->dma == D_DMA_RUNNING) {
@@ -1730,7 +1730,7 @@
 		if (tmp == cmd) {
 			printk
 			    ("scsi%d: Abort - command %ld found on disconnected_Q - ",
-			     instance->host_no, cmd->pid);
+			     instance->host_no, cmd->serial_number);
 			printk("Abort SNOOZE. ");
 			enable_irq(cmd->device->host->irq);
 			return FAILED;
@@ -2184,7 +2184,7 @@
 		if (hd->connected) {
 			cmd = (struct scsi_cmnd *) hd->connected;
 			sprintf(tbuf, " %ld-%d:%d(%02x)",
-				cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+				cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
 			strcat(bp, tbuf);
 		}
 	}
@@ -2193,7 +2193,7 @@
 		cmd = (struct scsi_cmnd *) hd->input_Q;
 		while (cmd) {
 			sprintf(tbuf, " %ld-%d:%d(%02x)",
-				cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+				cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
 			strcat(bp, tbuf);
 			cmd = (struct scsi_cmnd *) cmd->host_scribble;
 		}
@@ -2203,7 +2203,7 @@
 		cmd = (struct scsi_cmnd *) hd->disconnected_Q;
 		while (cmd) {
 			sprintf(tbuf, " %ld-%d:%d(%02x)",
-				cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+				cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
 			strcat(bp, tbuf);
 			cmd = (struct scsi_cmnd *) cmd->host_scribble;
 		}
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 53e1705..4fddef7 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -39,14 +39,12 @@
 	 * A SCSI Command is assigned a nonzero serial_number before passed
 	 * to the driver's queue command function.  The serial_number is
 	 * cleared when scsi_done is entered indicating that the command
-	 * has been completed.  It currently doesn't have much use other
-	 * than printk's.  Some lldd's use this number for other purposes.
-	 * It's almost certain that such usages are either incorrect or
-	 * meaningless.  Please kill all usages other than printk's.  Also,
-	 * as this number is always identical to ->pid, please convert
-	 * printk's to use ->pid, so that we can kill this field.
+	 * has been completed.  It is a bug for LLDDs to use this number
+	 * for purposes other than printk (and even that is only useful
+	 * for debugging).
 	 */
 	unsigned long serial_number;
+
 	/*
 	 * This is set to jiffies as it was when the command was first
 	 * allocated.  It is used to time how long the command has
@@ -116,7 +114,6 @@
 	int result;		/* Status code from lower level driver */
 
 	unsigned char tag;	/* SCSI-II queued command tag */
-	unsigned long pid;	/* Process ID, starts at 0. Unique per host. */
 };
 
 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 5b79697..7d210cd 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -580,7 +580,7 @@
 	 * Used to assign serial numbers to the cmds.
 	 * Protected by the host lock.
 	 */
-	unsigned long cmd_serial_number, cmd_pid; 
+	unsigned long cmd_serial_number;
 	
 	unsigned active_mode:2;
 	unsigned unchecked_isa_dma:1;