scsi: wd33c93: Move the SCSI pointer to private command data

Set .cmd_size in the SCSI host template instead of using the SCSI pointer
from struct scsi_cmnd. This patch prepares for removal of the SCSI pointer
from struct scsi_cmnd.

Link: https://lore.kernel.org/r/20220218195117.25689-48-bvanassche@acm.org
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 11 insertions, 8 deletions

diff --git a/drivers/scsi/a2091.c b/drivers/scsi/a2091.c
index bcbce23478b8..cf703a1ecdda 100644
--- a/drivers/scsi/a2091.c
+++ b/drivers/scsi/a2091.c
@@ -44,16 +44,17 @@ static irqreturn_t a2091_intr(int irq, void *data)
 
 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 {
+	struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
 	struct Scsi_Host *instance = cmd->device->host;
 	struct a2091_hostdata *hdata = shost_priv(instance);
 	struct WD33C93_hostdata *wh = &hdata->wh;
 	struct a2091_scsiregs *regs = hdata->regs;
 	unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
-	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
+	unsigned long addr = virt_to_bus(scsi_pointer->ptr);
 
 	/* don't allow DMA if the physical address is bad */
 	if (addr & A2091_XFER_MASK) {
-		wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
+		wh->dma_bounce_len = (scsi_pointer->this_residual + 511) & ~0x1ff;
 		wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
 						GFP_KERNEL);
 
@@ -77,8 +78,8 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 
 		if (!dir_in) {
 			/* copy to bounce buffer for a write */
-			memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
-			       cmd->SCp.this_residual);
+			memcpy(wh->dma_bounce_buffer, scsi_pointer->ptr,
+			       scsi_pointer->this_residual);
 		}
 	}
 
@@ -96,10 +97,10 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 
 	if (dir_in) {
 		/* invalidate any cache */
-		cache_clear(addr, cmd->SCp.this_residual);
+		cache_clear(addr, scsi_pointer->this_residual);
 	} else {
 		/* push any dirty cache */
-		cache_push(addr, cmd->SCp.this_residual);
+		cache_push(addr, scsi_pointer->this_residual);
 	}
 	/* start DMA */
 	regs->ST_DMA = 1;
@@ -111,6 +112,7 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 		     int status)
 {
+	struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(SCpnt);
 	struct a2091_hostdata *hdata = shost_priv(instance);
 	struct WD33C93_hostdata *wh = &hdata->wh;
 	struct a2091_scsiregs *regs = hdata->regs;
@@ -143,8 +145,8 @@ static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 	/* copy from a bounce buffer, if necessary */
 	if (status && wh->dma_bounce_buffer) {
 		if (wh->dma_dir)
-			memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
-			       SCpnt->SCp.this_residual);
+			memcpy(scsi_pointer->ptr, wh->dma_bounce_buffer,
+			       scsi_pointer->this_residual);
 		kfree(wh->dma_bounce_buffer);
 		wh->dma_bounce_buffer = NULL;
 		wh->dma_bounce_len = 0;
@@ -165,6 +167,7 @@ static struct scsi_host_template a2091_scsi_template = {
 	.sg_tablesize		= SG_ALL,
 	.cmd_per_lun		= CMD_PER_LUN,
 	.dma_boundary		= PAGE_SIZE - 1,
+	.cmd_size		= sizeof(struct scsi_pointer),
 };
 
 static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)