[SCSI] 53c700: remove reliance on deprecated cmnd fields

This one's quite tricky.  The 53c700 uses the now deprecated fields of
the command structure for saving the prior command when it does
autosense.  To fix this, we have to add extra fields to the LUN to
accommodate a copy of the real command.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 49 insertions, 39 deletions

diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index 4958c3b93c3..3c683dc2354 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -183,6 +183,10 @@ STATIC struct device_attribute *NCR_700_dev_attrs[];
 
 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
 
+struct NCR_700_sense {
+	unsigned char cmnd[MAX_COMMAND_SIZE];
+};
+
 static char *NCR_700_phase[] = {
 	"",
 	"after selection",
@@ -537,6 +541,7 @@ find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
 	 * finish routine.  If we cannot queue the command when it
 	 * is properly build, we then change to NCR_700_SLOT_QUEUED */
 	slot->state = NCR_700_SLOT_BUSY;
+	slot->flags = 0;
 	hostdata->command_slot_count++;
 	
 	return slot;
@@ -586,7 +591,7 @@ NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 	if(SCp->sc_data_direction != DMA_NONE &&
 	   SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
 		if(SCp->use_sg) {
-			dma_unmap_sg(hostdata->dev, SCp->buffer,
+			dma_unmap_sg(hostdata->dev, SCp->request_buffer,
 				     SCp->use_sg, SCp->sc_data_direction);
 		} else {
 			dma_unmap_single(hostdata->dev, slot->dma_handle,
@@ -608,30 +613,23 @@ NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 			(struct NCR_700_command_slot *)SCp->host_scribble;
 		
 		NCR_700_unmap(hostdata, SCp, slot);
-		dma_unmap_single(hostdata->dev, slot->pCmd,
-				 sizeof(SCp->cmnd), DMA_TO_DEVICE);
-		if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
+		if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
+			struct NCR_700_sense *sense = SCp->device->hostdata;
 #ifdef NCR_700_DEBUG
 			printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
 			       SCp, SCp->cmnd[7], result);
 			scsi_print_sense("53c700", SCp);
 
 #endif
+			dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
 			/* restore the old result if the request sense was
 			 * successful */
 			if(result == 0)
-				result = SCp->cmnd[7];
-			/* now restore the original command */
-			memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
-			       sizeof(SCp->data_cmnd));
-			SCp->request_buffer = SCp->buffer;
-			SCp->request_bufflen = SCp->bufflen;
-			SCp->use_sg = SCp->old_use_sg;
-			SCp->cmd_len = SCp->old_cmd_len;
-			SCp->sc_data_direction = SCp->sc_old_data_direction;
-			SCp->underflow = SCp->old_underflow;
-			
-		}
+				result = sense->cmnd[7];
+		} else
+			dma_unmap_single(hostdata->dev, slot->pCmd,
+					 sizeof(SCp->cmnd), DMA_TO_DEVICE);
+
 		free_slot(slot, hostdata);
 #ifdef NCR_700_DEBUG
 		if(NCR_700_get_depth(SCp->device) == 0 ||
@@ -979,6 +977,7 @@ process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 					"broken device is looping in contingent allegiance: ignoring\n");
 				NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
 			} else {
+				struct NCR_700_sense *sense = SCp->device->hostdata;
 #ifdef NCR_DEBUG
 				scsi_print_command(SCp);
 				printk("  cmd %p has status %d, requesting sense\n",
@@ -992,27 +991,25 @@ process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 				 * data associated with the command
 				 * here */
 				NCR_700_unmap(hostdata, SCp, slot);
-
-				SCp->cmnd[0] = REQUEST_SENSE;
-				SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
-				SCp->cmnd[2] = 0;
-				SCp->cmnd[3] = 0;
-				SCp->cmnd[4] = sizeof(SCp->sense_buffer);
-				SCp->cmnd[5] = 0;
-				SCp->cmd_len = 6;
+				dma_unmap_single(hostdata->dev, slot->pCmd,
+						 sizeof(SCp->cmnd),
+						 DMA_TO_DEVICE);
+
+				sense->cmnd[0] = REQUEST_SENSE;
+				sense->cmnd[1] = (SCp->device->lun & 0x7) << 5;
+				sense->cmnd[2] = 0;
+				sense->cmnd[3] = 0;
+				sense->cmnd[4] = sizeof(SCp->sense_buffer);
+				sense->cmnd[5] = 0;
 				/* Here's a quiet hack: the
 				 * REQUEST_SENSE command is six bytes,
 				 * so store a flag indicating that
 				 * this was an internal sense request
 				 * and the original status at the end
 				 * of the command */
-				SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
-				SCp->cmnd[7] = hostdata->status[0];
-				SCp->use_sg = 0;
-				SCp->sc_data_direction = DMA_FROM_DEVICE;
-				dma_sync_single_for_device(hostdata->dev, slot->pCmd,
-							   SCp->cmd_len, DMA_TO_DEVICE);
-				SCp->request_bufflen = sizeof(SCp->sense_buffer);
+				sense->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
+				sense->cmnd[7] = hostdata->status[0];
+				slot->pCmd = dma_map_single(hostdata->dev, sense->cmnd, sizeof(sense->cmnd), DMA_TO_DEVICE);
 				slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
 				slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
 				slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
@@ -1024,6 +1021,7 @@ process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 				
 				/* queue the command for reissue */
 				slot->state = NCR_700_SLOT_QUEUED;
+				slot->flags = NCR_700_FLAG_AUTOSENSE;
 				hostdata->state = NCR_700_HOST_FREE;
 				hostdata->cmd = NULL;
 			}
@@ -1244,7 +1242,7 @@ process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 
 			if(SCp->use_sg) {
 				for(i = 0; i < SCp->use_sg + 1; i++) {
-					printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
+					printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->request_buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
 				}
 			}
 		}	       
@@ -1403,12 +1401,14 @@ NCR_700_start_command(struct scsi_cmnd *SCp)
 	/* keep interrupts disabled until we have the command correctly
 	 * set up so we cannot take a selection interrupt */
 
-	hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
+	hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
+						slot->flags != NCR_700_FLAG_AUTOSENSE),
 					       SCp->device->lun);
 	/* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
 	 * if the negotiated transfer parameters still hold, so
 	 * always renegotiate them */
-	if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
+	if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
+	   slot->flags == NCR_700_FLAG_AUTOSENSE) {
 		NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 	}
 
@@ -1417,7 +1417,8 @@ NCR_700_start_command(struct scsi_cmnd *SCp)
 	 * will refuse all tags, so send the request sense as untagged
 	 * */
 	if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
-	   && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
+	   && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
+	       slot->flags != NCR_700_FLAG_AUTOSENSE)) {
 		count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
 	}
 
@@ -1863,8 +1864,9 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
 		__u32 count = 0;
 
 		if(SCp->use_sg) {
-			sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
-					      SCp->use_sg, direction);
+			sg_count = dma_map_sg(hostdata->dev,
+					      SCp->request_buffer, SCp->use_sg,
+					      direction);
 		} else {
 			vPtr = dma_map_single(hostdata->dev,
 					      SCp->request_buffer, 
@@ -1879,7 +1881,7 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
 		for(i = 0; i < sg_count; i++) {
 
 			if(SCp->use_sg) {
-				struct scatterlist *sg = SCp->buffer;
+				struct scatterlist *sg = SCp->request_buffer;
 
 				vPtr = sg_dma_address(&sg[i]);
 				count = sg_dma_len(&sg[i]);
@@ -2042,6 +2044,11 @@ NCR_700_slave_configure(struct scsi_device *SDp)
 	struct NCR_700_Host_Parameters *hostdata = 
 		(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
 
+	SDp->hostdata = kmalloc(GFP_KERNEL, sizeof(struct NCR_700_sense));
+
+	if (!SDp->hostdata)
+		return -ENOMEM;
+
 	/* to do here: allocate memory; build a queue_full list */
 	if(SDp->tagged_supported) {
 		scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
@@ -2065,7 +2072,8 @@ NCR_700_slave_configure(struct scsi_device *SDp)
 STATIC void
 NCR_700_slave_destroy(struct scsi_device *SDp)
 {
-	/* to do here: deallocate memory */
+	kfree(SDp->hostdata);
+	SDp->hostdata = NULL;
 }
 
 static int
diff --git a/drivers/scsi/53c700.h b/drivers/scsi/53c700.h
index a8c83bb0363..d8041952b1b 100644
--- a/drivers/scsi/53c700.h
+++ b/drivers/scsi/53c700.h
@@ -163,6 +163,8 @@ struct NCR_700_command_slot {
 	#define NCR_700_SLOT_BUSY (1|NCR_700_SLOT_MAGIC) /* slot has command active on HA */
 	#define NCR_700_SLOT_QUEUED (2|NCR_700_SLOT_MAGIC) /* slot has command to be made active on HA */
 	__u8	state;
+	#define NCR_700_FLAG_AUTOSENSE	0x01
+	__u8	flags;
 	int	tag;
 	__u32	resume_offset;
 	struct scsi_cmnd *cmnd;