[PATCH v4 49/50] scsi: zalon: Stop using the SCSI pointer

Bart Van Assche
2022-02-16T21:04:36Z

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.

Cc: Helge Deller <deller@gmx.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/ncr53c8xx.c | 22 ++++++++++++----------
drivers/scsi/ncr53c8xx.h | 6 ++++++
drivers/scsi/zalon.c | 1 +
3 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/ncr53c8xx.c b/drivers/scsi/ncr53c8xx.c
index fc8abe05fa8f..4458449c960b 100644
--- a/drivers/scsi/ncr53c8xx.c
+++ b/drivers/scsi/ncr53c8xx.c
@@ -514,30 +514,29 @@ static m_addr_t __vtobus(m_bush_t bush, void *m)
* Deal with DMA mapping/unmapping.
*/

-/* To keep track of the dma mapping (sg/single) that has been set */
-#define __data_mapped SCp.phase
-#define __data_mapping SCp.have_data_in
-
static void __unmap_scsi_data(struct device *dev, struct scsi_cmnd *cmd)
{
- switch(cmd->__data_mapped) {
+ struct ncr_cmd_priv *cmd_priv = scsi_cmd_priv(cmd);
+
+ switch(cmd_priv->data_mapped) {
case 2:
scsi_dma_unmap(cmd);
break;
}
- cmd->__data_mapped = 0;
+ cmd_priv->data_mapped = 0;
}

static int __map_scsi_sg_data(struct device *dev, struct scsi_cmnd *cmd)
{
+ struct ncr_cmd_priv *cmd_priv = scsi_cmd_priv(cmd);
int use_sg;

use_sg = scsi_dma_map(cmd);
if (!use_sg)
return 0;

- cmd->__data_mapped = 2;
- cmd->__data_mapping = use_sg;
+ cmd_priv->data_mapped = 2;
+ cmd_priv->data_mapping = use_sg;

return use_sg;
}
@@ -7854,6 +7853,7 @@ static int ncr53c8xx_slave_configure(struct scsi_device *device)

static int ncr53c8xx_queue_command_lck(struct scsi_cmnd *cmd)
{
+ struct ncr_cmd_priv *cmd_priv = scsi_cmd_priv(cmd);
void (*done)(struct scsi_cmnd *) = scsi_done;
struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
unsigned long flags;
@@ -7864,8 +7864,8 @@ printk("ncr53c8xx_queue_command\n");
#endif

cmd->host_scribble = NULL;
- cmd->__data_mapped = 0;
- cmd->__data_mapping = 0;
+ cmd_priv->data_mapped = 0;
+ cmd_priv->data_mapping = 0;

spin_lock_irqsave(&np->smp_lock, flags);

@@ -8085,6 +8085,8 @@ struct Scsi_Host * __init ncr_attach(struct scsi_host_template *tpnt,
u_long flags = 0;
int i;

+ WARN_ON_ONCE(tpnt->cmd_size < sizeof(struct ncr_cmd_priv));
+
if (!tpnt->name)
tpnt->name = SCSI_NCR_DRIVER_NAME;
if (!tpnt->shost_groups)
diff --git a/drivers/scsi/ncr53c8xx.h b/drivers/scsi/ncr53c8xx.h
index fa14b5ca8783..be38c902859e 100644
--- a/drivers/scsi/ncr53c8xx.h
+++ b/drivers/scsi/ncr53c8xx.h
@@ -1288,6 +1288,12 @@ struct ncr_device {
u8 differential;
};

+/* To keep track of the dma mapping (sg/single) that has been set */
+struct ncr_cmd_priv {
+ int data_mapped;
+ int data_mapping;
+};
+
extern struct Scsi_Host *ncr_attach(struct scsi_host_template *tpnt, int unit, struct ncr_device *device);
extern void ncr53c8xx_release(struct Scsi_Host *host);
irqreturn_t ncr53c8xx_intr(int irq, void *dev_id);
diff --git a/drivers/scsi/zalon.c b/drivers/scsi/zalon.c
index f1e5cf8a17d9..22d412cab91d 100644
--- a/drivers/scsi/zalon.c
+++ b/drivers/scsi/zalon.c
@@ -81,6 +81,7 @@ lasi_scsi_clock(void * hpa, int defaultclock)
static struct scsi_host_template zalon7xx_template = {
.module = THIS_MODULE,
.proc_name = "zalon7xx",
+ .cmd_size = sizeof(struct ncr_cmd_priv),
};

static int __init